UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): August 6, 2020
AVROBIO, INC.
(Exact name of registrant as specified in its charter)
| Delaware | 001-38537 | 81-0710585 | ||
| (State or other jurisdiction of incorporation) |
(Commission File Number) |
(I.R.S. Employer Identification No.) |
One Kendall Square
Building 300, Suite 201
Cambridge, MA 02139
(Address of principal executive offices, including zip code)
(617) 914-8420
(Registrant’s telephone number, including area code)
Not Applicable
(Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
| ☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |
| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |
| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |
Securities registered pursuant to Section 12(b) of the Act:
| Title of each class |
Trading symbol(s) |
Name of each exchange on which registered | ||
| Common Stock, $0.0001 par value per share | AVRO | Nasdaq Global Select Market |
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).
Emerging growth company ☒
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 2.02. Results of Operations and Financial Condition.
On August 6, 2020, AVROBIO, Inc. (the “Company”) issued a press release containing information about the Company’s results of operations for the three and six months ended June 30, 2020. A copy of this press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.
Item 7.01. Regulation FD Disclosure.
On August 6, 2020, the Company updated its corporate presentation for use in meetings with investors, analysts and others. A copy of the slide presentation is furnished as Exhibit 99.2 to this Current Report on Form 8-K.
The information in this Form 8-K (including Exhibits 99.1 and 99.2) shall not be deemed “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits
| 99.1 | Press release issued by AVROBIO, Inc., dated August 6, 2020. | |
| 99.2 |
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
| AVROBIO, INC. | ||||||
| Date: August 6, 2020 | By: | /s/ Geoff MacKay | ||||
| Geoff MacKay | ||||||
| President and Chief Executive Officer | ||||||
Exhibit 99.1
AVROBIO Reports Second Quarter 2020 Financial Results and Provides Business Update
New data indicate stable kidney function across the two Fabry disease clinical studies up to 32 months
New six-month Phase 2 FAB-201 data from first patient treated using AVROBIO’s plato ® gene therapy platform show continued reduction in toxic metabolite plasma lyso-Gb3 and increased leukocyte and plasma enzyme activity
Sustained clinical data across multiple other measures for Phase 1 and Phase 2 trials for Fabry disease
First patient has been dosed in global Phase 1/2 clinical trial for Gaucher disease type 1 and second patient has been dosed in investigator-sponsored Phase 1/2 clinical trial for cystinosis
CAMBRIDGE, Mass., Aug. 6, 2020 — AVROBIO, Inc. (Nasdaq: AVRO), a leading clinical-stage gene therapy company with a mission to free people from a lifetime of genetic disease, today reported financial results for the second quarter ended June 30, 2020 and provided a business update.
“We have continued to progress our clinical trials despite the challenges of the COVID-19 global pandemic and have now dosed 12 patients across four clinical trials, with initial data from the first patient dosed in our Gaucher program expected later this year,” said Geoff MacKay, AVROBIO’s president and CEO. “As we look at the new data that we released this quarter, we’re pleased to see that longer-term measures suggest kidney function is stable across our Fabry trials. This is a critically important functional measure for people living with Fabry disease, as Fabry disease progression is characterized by a marked decrease in kidney function. We believe these clinically meaningful data further reinforce the potential of our single-dose investigational gene therapies to deliver a new standard of care for lysosomal disorders.”
Clinical Trials of AVR-RD-01 in Fabry Disease: Data Updates
AVROBIO is conducting two clinical trials for its investigational gene therapy for Fabry disease, which continue to generate data relating to durability and tolerability with interim results that could support potential first-line use.
Phase 2 FAB-201 clinical trial
Four patients have been dosed in the global Phase 2 FAB-201 trial evaluating treatment-naïve patients. New data from these patients, now six to 22 months post-gene therapy, include:
| • | All four patients show sustained increased leukocyte and plasma enzyme activity, suggesting the continued production of an endogenous supply of functional alpha-galactosidase (AGA) enzyme. |
| • | Levels of the toxic metabolite plasma lyso-Gb3, a key biomarker for monitoring Fabry disease, have decreased 86, 49 and 59 percent from baseline for Patients 1, 3 and 4 at 22, 12 and six months, respectively. Patient 2, a cardiac variant who does not have classic Fabry disease, did have very low levels of plasma lyso-Gb3 at baseline and hence did not show a meaningful decrease in plasma lyso-Gb3 levels, as expected for such a variant. |
| • | A kidney biopsy was successfully obtained on Patient 3, but due to human error at the external laboratory vendor, appropriate handling of the biopsy failed and the kidney Gb3 inclusions could not be evaluated and will not be available. AVROBIO’s Quality Assurance team has worked closely with the external vendor to identify the cause of the error and determine additional protocols for implementation by the vendor that are designed to prevent similar errors in the future. |
| • | Other data and important functional measures obtained from Patient 3 include: |
| • | Kidney function measures, including estimated glomerular filtration rate (eGFR) and measured glomerular filtration rate (mGFR), which indicated the patient’s kidney function is stable compared to baseline, consistent with the other patients in the AVR-RD-01 Phase 1 and Phase 2 trials at the 48-week timepoint. |
| • | Cardiac function measures, including ejection fraction (EF), left ventricular (LV) mass and LV mass index, remain stable and in the normal range. |
| • | As previously reported, the kidney biopsy for Patient 1 in the trial showed an 87-percent reduction in Gb3 inclusions per peritubular capillary compared to baseline. Patient 2, a cardiac variant who does not have classic Fabry disease, did not have any Gb3 accumulated in the kidney at baseline and as such did not demonstrate any response in this endpoint, as expected for such a variant. The kidney biopsy for Patient 4 is expected in 1Q 2021. |
| • | Patient 4, now six months following dosing with drug product manufactured using AVROBIO’s plato® gene therapy platform, showed a stable vector copy number (VCN) of 1.17 and AGA enzyme activity 5.1-fold higher in leukocytes and 3.7-fold higher in plasma compared to the mean activity level of the first three patients in the same trial at the same timepoint, who were treated using an academic platform. |
| • | New eGFR data, which is a measure of kidney function, was stable across all patients in the trial up to 22 months following dosing. eGFR is well documented in natural history studies to decline in classic male Fabry disease patients and we interpret the consistent emerging data set showing stable eGFR as positive. |
| • | Anticipate patient dosing may resume incrementally, as allowed by hospitals and travel restrictions, but further delays are expected as sites remain impacted by COVID-19-related care. We have multiple patients identified as possible trial participants once hospitals and travel restrictions allow. |
Phase 1 FACTs (Fabry disease Clinical research and Therapeutics) trial for Fabry disease
Five patients are participating in the fully enrolled Phase 1 investigator-led clinical trial. New data from these patients, now all out one year or more, up to 32 months post gene therapy, include:
| • | All five patients show sustained increased leukocyte and plasma enzyme activity. |
| • | Toxic metabolite plasma lyso-Gb3 levels are lower or similar to the levels observed when the patient received only enzyme replacement therapy (ERT) prior to administration of AVR-RD-01. Plasma lyso-Gb3 levels for Patient 4, who discontinued ERT six months post gene therapy administration, showed a slight increase in plasma lyso-Gb3 levels but his lyso-Gb3 levels remain within range for Fabry disease patients on ERT observed in this study and he remains off ERT. |
| • | VCN across all patients is stable, with a range between 0.1 and 0.6, up to 32 months following dosing. |
| • | New eGFR data was stable up to 32 months following dosing across four patients in this trial. The other patient who entered the trial with moderate chronic kidney disease and an eGFR below 50 mL/min/1.73m2, has not stabilized his kidney function, which is to be expected given the low initial eGFR. He also remains on ERT. |
Overall, all patients in the Phase 1 trial who discontinued ERT after dosing with AVR-RD-01 remain off ERT.
As of the most recent safety data cut-off date of April 23, 2020, there have been no serious adverse events (SAEs) attributed to the AVR-RD-01 drug product in either the Phase 1 or Phase 2 trial. Through the safety data cut-off date, four SAEs have been reported in the FAB-201 trial and two SAEs in the Phase 1 trial. Across both studies, each of the SAEs has been consistent with expectations of the stem cell mobilization, conditioning regimen, underlying disease or pre-existing conditions. Anti-AGA antibody titers have been observed in four patients in the Phase 1 trial and two patients in the Phase 2 trial. We believe none of these are of clinical significance.
Slides with these new data can be found in the company’s current corporate overview presentation here.
Other Program Updates and Milestones
AVR-RD-04 Phase 1/2 investigator-sponsored clinical trial for cystinosis
AVROBIO’s investigational gene therapy for cystinosis is being evaluated in a single-arm, Phase 1/2 trial sponsored by the University of California, San Diego (UCSD)1 and is expected to enroll up to six patients.
| • | Patient 2 was dosed in June 2020. |
| • | Six-month data for both eGFR and serum creatinine measures from Patient 1 was presented at ASGCT in May 2020. |
| • | Patient recruitment activities continue. |
AVR-RD-02 Phase 1/2 trial for Gaucher disease
AVROBIO’s investigational gene therapy for Gaucher disease is being studied in the GuardOne clinical trial, a Phase 1/2 trial to evaluate the safety and efficacy in individuals with Gaucher disease type 1. The trial is expected to enroll eight to 16 patients between the ages of 18 and 35 who are treatment-naïve and on ERT.
| • | Patient 1 was dosed in AVROBIO’s global Phase 1/2 clinical trial in July 2020. |
| • | Subsequent new patient dosing and enrollment timelines have been impacted by the COVID-19 pandemic. However, patient recruitment activities continue for our clinical sites in Australia and Canada. |
| • | New clinical sites expected to open in the U.S. and Israel in the fourth quarter of the year. |
AVR-RD-03 preclinical program in Pompe disease
AVROBIO’s research program for Pompe disease, AVR-RD-03, is currently advancing a candidate through pre-clinical studies.
| • | Data presented at ASGCT in May 2020 showed the ability of AVROBIO’s optimized lentiviral vectors, in combination with a proprietary Glycosylation-Independent Lysosomal Targeting (GILT)-tag technology, to demonstrate significant glycogen reduction in both the muscle and central nervous system of a Pompe disease mouse model. |
| • | A preclinical Investigational New Drug (IND)-enabling proof-of-concept study is currently underway and expected to conclude in 2020. |
| 1 | Collaborator-sponsored Phase 1/2 clinical trial of AVR-RD-04 is funded in part by grants to UCSD from the California Institute for Regenerative Medicine (CIRM), Cystinosis Research Foundation (CRF) and National Institutes of Health (NIH). |
Business Updates
| • | Kim Raineri has been appointed as chief manufacturing and technology officer (CMTO). Kim Warren, Ph.D., AVROBIO’s founding CMTO, will retire at the end of July but will continue in a consultant role during the transition phase. |
| • | AVROBIO expects to host its first R&D Day virtually in 4Q 2020 and intends to provide an update on ongoing clinical programs, a review of other pipeline programs and an in-depth overview of its plato platform. |
Second Quarter 2020 Financial Results
AVROBIO reported a net loss of $28.8 million for the second quarter of 2020 as compared to a net loss of $16.1 million for the comparable period in 2019. This increase was due to increased research and development expenses, as well as increased general and administrative expenses.
Research and development expenses were $20.9 million for the second quarter of 2020 as compared to $12.3 million for the comparable period in 2019. This increase was driven by increased program development activities related to the advancement of the company’s pipeline, as well as increased personnel-related costs resulting from an increase in employee headcount, which includes the impact of non-cash stock-based compensation.
General and administrative expenses were $8.0 million for the second quarter of 2020 as compared to $4.3 million for the comparable period in 2019. This increase was primarily due to an increase in employee headcount, which includes the impact of non-cash stock-based compensation, as well as professional fees and consulting costs.
As of June 30, 2020, AVROBIO had $244.4 million in cash and cash equivalents, as compared to $187.0 million in cash and cash equivalents as of December 31, 2019. Based on the company’s current operating plan, AVROBIO expects its cash and cash equivalents as of June 30, 2020 will enable the company to fund its operating expenses and capital expenditure requirements into the second half of 2022.
About AVROBIO
Our mission is to free people from a lifetime of genetic disease with a single dose of gene therapy. We aim to halt or reverse disease throughout the body by driving durable expression of functional protein, even in hard-to-reach tissues and organs including the brain, muscle and bone. Our clinical-stage programs include Fabry disease, Gaucher disease and cystinosis and we also are advancing a program in Pompe disease. AVROBIO is powered by the plato® gene therapy platform, our foundation designed to scale gene therapy worldwide. We are headquartered in Cambridge, Mass., with an office in Toronto, Ontario. For additional information, visit avrobio.com, and follow us on Twitter and LinkedIn.
Forward-Looking Statements
This press release contains forward-looking statements, including statements made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements may be identified by words and phrases such as “aims,” “anticipates,” “believes,” “could,” “designed to,” “estimates,” “expects,” “forecasts,” “goal,” “intends,” “may,” “plans,” “possible,” “potential,” “seeks,” “will,” and variations of these words and phrases or similar expressions that are intended to identify forward-looking statements. These forward-looking statements include, without limitation, statements regarding our business strategy for and the potential therapeutic benefits of our prospective product candidates; the design, commencement, enrollment and timing of ongoing or planned clinical trials and regulatory pathways; the timing of patient recruitment and enrollment activities, clinical trial results, and product approvals, including the expected timing of the kidney biopsy for the fourth patient in our Phase 2 FAB-201 clinical trial for AVR-RD-01; the timing of our ongoing preclinical studies, including our IND-enabling proof-of-concept study of AVR-RD-03 for Pompe disease; the anticipated benefits of our gene therapy platform including the potential impact on our commercialization activities, timing and likelihood of success; the expected benefits and results of our implementation of the plato platform in our clinical trials and gene therapy programs; the expected safety profile of our investigational gene therapies; the potential impact of the COVID-19 outbreak on our clinical trial programs and business generally, as well as our plans and expectations with respect to the timing and resumption of any development activities that may be temporarily paused as a result of the COVID-19 outbreak; and statements regarding our financial and cash position and expected cash runway. Any such statements in this press release that are not statements of historical fact may be deemed to be forward-looking statements. Results in pre-clinical or early-stage clinical trials may not be indicative of results from later stage or larger scale clinical trials and do not ensure regulatory approval. You should not place undue reliance on these statements, or the scientific data presented.
Any forward-looking statements in this press release are based on AVROBIO’s current expectations, estimates and projections about our industry as well as management’s current beliefs and expectations of future events only as of today and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to, the risk that any one or more of AVROBIO’s product candidates will not be successfully developed or commercialized; the risk of cessation or delay of any ongoing or planned clinical trials of AVROBIO or our collaborators; the risk that AVROBIO may not successfully recruit or enroll a sufficient number of patients for our clinical trials; the risk that AVROBIO may not realize the intended benefits of our gene therapy platform, including the features of our plato platform; the risk that our product candidates or procedures in connection with the administration thereof will not have the safety or efficacy profile that we anticipate; the risk that prior results, such as signals of safety, activity or durability of effect, observed from pre-clinical or clinical trials, will not be replicated or will not continue in ongoing or future
studies or trials involving AVROBIO’s product candidates; the risk that we will be unable to obtain and maintain regulatory approval for our product candidates; the risk that the size and growth potential of the market for our product candidates will not materialize as expected; risks associated with our dependence on third-party suppliers and manufacturers; risks regarding the accuracy of our estimates of expenses and future revenue; risks relating to our capital requirements and needs for additional financing; risks relating to clinical trial and business interruptions resulting from the COVID-19 outbreak or similar public health crises, including that such interruptions may materially delay our development timeline and/or increase our development costs or that data collection efforts may be impaired or otherwise impacted by such crises; and risks relating to our ability to obtain and maintain intellectual property protection for our product candidates. For a discussion of these and other risks and uncertainties, and other important factors, any of which could cause AVROBIO’s actual results to differ materially and adversely from those contained in the forward-looking statements, see the section entitled “Risk Factors” in AVROBIO’s most recent Quarterly Report, as well as discussions of potential risks, uncertainties and other important factors in AVROBIO’s subsequent filings with the Securities and Exchange Commission. AVROBIO explicitly disclaims any obligation to update any forward-looking statements except to the extent required by law.
Investor Contact:
Christopher F. Brinzey
Westwicke, an ICR Company
339-970-2843
chris.brinzey@westwicke.com
Media Contact:
Tom Donovan
Ten Bridge Communications
857-559-3397
tom@tenbridgecommunications.com
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands)
(Unaudited)
| June 30, | December 31, | |||||||
| 2020 | 2019 | |||||||
| Cash and cash equivalents |
$ | 244,380 | $ | 187,043 | ||||
| Prepaid expenses and other current assets |
6,640 | 8,658 | ||||||
| Property and equipment, net |
3,580 | 3,696 | ||||||
| Other assets |
968 | 1,117 | ||||||
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|||||
| Total assets |
$ | 255,568 | $ | 200,514 | ||||
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| Accounts payable |
$ | 2,619 | $ | 3,949 | ||||
| Accrued expenses and other current liabilities |
12,792 | 10,068 | ||||||
| Deferred rent, net of current portion |
370 | 484 | ||||||
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| Total liabilities |
15,781 | 14,501 | ||||||
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| Total stockholders’ equity |
239,787 | 186,013 | ||||||
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| Total liabilities and stockholders’ equity |
$ | 255,568 | $ | 200,514 | ||||
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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except share and per share data)
(Unaudited)
| Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||
| 2020 | 2019 | 2020 | 2019 | |||||||||||||
| Operating expenses: |
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| Research and development |
$ | 20,866 | $ | 12,267 | $ | 39,140 | $ | 24,713 | ||||||||
| General and administrative |
7,991 | 4,345 | 16,306 | 9,599 | ||||||||||||
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| Total operating expenses |
28,857 | 16,612 | 55,446 | 34,312 | ||||||||||||
| Loss from operations |
(28,857 | ) | (16,612 | ) | (55,446 | ) | (34,312 | ) | ||||||||
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| Total other income (expense), net |
29 | 557 | 645 | 1,154 | ||||||||||||
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| Net loss |
$ | (28,828 | ) | $ | (16,055 | ) | $ | (54,801 | ) | $ | (33,158 | ) | ||||
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| Net loss attributable to common stockholders – basic and diluted |
$ | (28,828 | ) | $ | (16,055 | ) | $ | (54,801 | ) | $ | (33,158 | ) | ||||
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| Net loss per share attributable to common stockholders — basic and diluted |
$ | (0.80 | ) | $ | (0.67 | ) | $ | (1.57 | ) | $ | (1.38 | ) | ||||
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| Weighted-average number of common shares used in computing net loss per share attributable to common stockholders—basic and diluted |
36,104,919 | 24,046,262 | 34,885,804 | 23,985,717 | ||||||||||||
Company Presentation August 2020 Exhibit 99.2
Disclaimer This presentation has been prepared by AVROBIO, Inc. (“AVROBIO”) for informational purposes only and not for any other purpose. Certain information contained in this presentation and statements made orally during this presentation relate to or are based on studies, publications, surveys and other data obtained from third-party sources and AVROBIO’s own internal estimates and research. While AVROBIO believes these third-party sources to be reliable as of the date of this presentation, it has not independently verified, and AVROBIO makes no representation as to the adequacy, fairness, accuracy or completeness of any information obtained from third-party sources. While AVROBIO believes its internal research is reliable, such research has not been verified by any independent source. This presentation may contain forward-looking statements made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements may be identified by words and phrases such as “aims,” “anticipates,” “believes,” “could,” “designed to,” “estimates,” “expects,” “forecasts,” “goal,” “intends,” “may,” “plans,” “possible,” “potential,” “seeks,” “will,” and variations of these words and phrases or similar expressions that are intended to identify forward-looking statements. These forward-looking statements include, without limitation, statements regarding our business strategy for and the potential therapeutic benefits of our prospective product candidates; the design, commencement, enrollment and timing of ongoing or planned clinical trials and regulatory pathways; the timing of patient recruitment and enrollment activities, clinical trial results, and product approvals; the timing of our ongoing preclinical studies; the anticipated benefits of our gene therapy platform including the potential impact on our commercialization activities, timing and likelihood of success; the expected benefits and results of our implementation of the plato® platform in our clinical trials and gene therapy programs; the expected safety profile of our investigational gene therapies; the potential impact of the COVID-19 outbreak on our clinical trial programs and business generally, as well as our plans and expectations with respect to the timing and resumption of any development activities that may be temporarily paused as a result of the COVID-19 outbreak; the market opportunity for and anticipated commercial activities relating to our investigational gene therapies; and statements regarding our financial and cash position and expected cash runway. Any such statements in this presentation that are not statements of historical fact may be deemed to be forward-looking statements. Any forward-looking statements in this presentation are based on our current expectations, estimates and projections about our industry as well as management’s current beliefs and expectations of future events only as of today and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to, the risk that any one or more of our product candidates will not be successfully developed or commercialized; the risk of cessation or delay of any ongoing or planned clinical trials of AVROBIO or our collaborators; the risk that we may not successfully recruit or enroll a sufficient number of patients for our clinical trials; the risk that we may not realize the intended benefits of our gene therapy platform, including the features of our plato platform; the risk that our product candidates or procedures in connection with the administration thereof will not have the safety or efficacy profile that we anticipate; the risk that prior results, such as signals of safety, activity or durability of effect, observed from preclinical or clinical trials, will not be replicated or will not continue in ongoing or future studies or trials involving our product candidates; the risk that we will be unable to obtain and maintain regulatory approval for our product candidates; the risk that the size and growth potential of the market for our product candidates will not materialize as expected; risks associated with our dependence on third-party suppliers and manufacturers; risks regarding the accuracy of our estimates of expenses and future revenue; risks relating to our capital requirements and needs for additional financing; risks relating to clinical trial and business interruptions resulting from the COVID-19 outbreak or similar public health crises, including that such interruptions may materially delay our development timeline and/or increase our development costs or that data collection efforts may be impaired or otherwise impacted by such crises; and risks relating to our ability to obtain and maintain intellectual property protection for our product candidates. For a discussion of these and other risks and uncertainties, and other important factors, any of which could cause AVROBIO’s actual results to differ from those contained in the forward-looking statements, see the section entitled “Risk Factors” in AVROBIO’s most recent Quarterly Report on Form 10-Q, as well as discussions of potential risks, uncertainties and other important factors in AVROBIO’s subsequent filings with the Securities and Exchange Commission. AVROBIO explicitly disclaims any obligation to update any forward-looking statements except to the extent required by law. Note regarding trademarks: plato is a registered trademark of AVROBIO. Other trademarks referenced in this presentation are the property of their respective owners. Note regarding future updates: The statements contained in this presentation reflect our current views with respect to future evets, which may change significantly as the global consequences of the COVID-19 pandemic rapidly develop. Accordingly, we do not undertake and specifically disclaim any obligation to update any forward-looking statements.
Our mission: Giving people with genetic disease freedom for life
Multiple programs in the clinic Investigational Gene Therapy Proof-of-Concept IND-Enabling Phase 1/2 Commercial Rights Fabry AVR-RD-01 AVROBIO Gaucher AVR-RD-02 AVROBIO Cystinosis AVR-RD-04 AVROBIO Pompe AVR-RD-03 Preclinical AVROBIO Phase 2 Phase 1/2 Phase 1/2 12 patients dosed to date across three clinical trials IND: Investigational New Drug
Addressing multi-billion dollar market opportunity Disease Est. Cost Per Patient Per Year Approx. 2019 Net Sales Selected Companies Fabry $1.4B Gaucher $1.4B Pompe $1.0B Cystinosis $0.2B CURRENT STANDARD OF CARE COSTS Sources: Rombach S et al, Orphanet J Rare Dis, 2013; van Dussen L et al, Orphanet J Rare Dis, 2014; WAC pricing from Redbook; 2019 Net Sales from company annual and other reports * for Horizon’s Procysbi oral therapy (delayed release cysteamine bitartrate) Note: Shire acquired by Takeda in 2019 $320k $250k-400k $500k $625k-700k*
Lifelong treatments vs. potential single-dose therapy Treatment burden Enzyme or protein level DISEASE PROGRESSION CONTINUES DISEASE PROGRESSION COULD HALT OR REVERSE Enzyme Replacement Therapy (ERT) Temporary bolus of enzyme, not curative Bi-Weekly ERT Plasma Pharmacokinetics of ERT Life-long infusions Transient, intermittent elevation Bi-weekly IV infusions AVROBIO Gene Therapy Designed for 24/7 expression of protein, curative potential Functional Protein Expression in Transduced HSCs and Their Progeny 24/7 expression One-Time Gene Therapy Long-term, continuous elevation Single IV infusion ERT: Enzyme Replacement Therapy; IV: Intravenous; HSC: Hematopoietic Stem Cells
Established ex vivo lentiviral approach Transduce with lentiviral vector carrying therapeutic gene GENE THERAPY APPROACH Select CD34+ stem cells Collect mobilized blood 3 2 1 Harvest and freeze 4 Condition and dose 5
Fabry Disease AVR-RD-01
Goals for gene therapy in Fabry disease UNMET NEEDS: Kidney function Unmet needs: proteinuria, polyuria, kidney failure Cardiac function Unmet needs: left ventricular hypertrophy, fibrosis, heart failure Neuropathic pain Unmet needs: pain and burning sensations in hands and feet, pain crises Everyday burden of illness and life expectancy Unmet needs: fatigue, inability to sweat, joint pain, abdominal pain, diarrhea, vomiting, cloudy vision, hearing loss, tinnitus, rash, angiokeratomas, biweekly infusions, shortened lifespan CNS complications Unmet needs: TIA/stroke, depression, impaired executive function, white matter hyperintensities Sources: Wanner C et al, Med Genetics and Metab, 2018; Burlina A, JIEMS, 2016 CNS: Central Nervous System; TIA: Transient Ischemic Attack
Two AVR-RD-01 Fabry clinical trials 9 patients dosed across Phases 1 and 2 PHASE 1 Investigator-Sponsored Trial* PHASE 2 AVRO – FAB-201 Trial Patients Patients Key Objective Key Objectives n = 5 (fully enrolled) On ERT > 6 months prior to enrollment 18 - 50 year-old males n = 8-12 (4 patients dosed to-date) Treatment-naive 16 - 50 year-old males Safety and preliminary efficacy Safety and efficacy FAB-201 = AVRO-RD-01-201 Study * Sponsored by FACTs team (Fabry Disease Clinical Research and Therapeutics) in Canada ERT: Enzyme Replacement Therapy
PATIENT 1 PATIENT 2 PATIENT 3 PATIENT 4 Age of symptom onset / diagnosis 10 / 19 years 36 / 37 years 13 / 13 years 9 / 9 years Age dosed with AVR-RD-01 21 years 46 years 40 years 26 years Mutation c.1021G>A (p.E341K) c.644A>G (p.N215S) c.639+1G>T c.833dupA Primary disease signs and symptoms Kidney disease Chronic pain GI symptoms Decreased cold sensation Cardiac disease Peripheral neuropathy Chronic pain Increased tiredness GI symptoms Intermittent tinnitus Mild high frequency hearing loss Raynaud’s syndrome Kidney disease GI symptoms Peripheral neuropathy Bilateral deafness Tinnitus Peripheral edema Decreased cold sensation Chronic pain Peripheral neuropathy Neuropathic shuffling gait Lethargy Temperature intolerance Tinnitus Hearing loss GI symptoms Leukocyte AGA enzyme activity at baseline (nmol/hr/mg protein) 0.10* 2.38** 0.58** 0.46** Plasma lyso-Gb3 at baseline (nM) 202*** 8*** 147*** 92*** Comment IgA deposits in kidney biopsy Cardiac variant, not a classic Fabry male Fabry FAB-201 Patient Characteristics Treatment-naïve Fabry patients * Mayo Lab, ref range ≥23.1 nmol/hr/mg ** Rupar Lab, ref range 24-56 nmol/hr/mg *** Reference value ≤ 2.4 nM AGA: α‑galactosidase A; Lyso-Gb3: Globotriaosylsphingosine; GI: Gastrointestinal; IgA: Immunoglobulin-A
Patient 1: 87% substrate reduction in kidney biopsy at 1 year Average number of Gb3 inclusions per peritubular capillary (PTC) Baseline 1 Year (48 weeks) 3.55 0.47 Unpaired t-test for difference between n=55 PTCs at baseline vs. n=101 PTCs at 1 year; p < 0.0001 Error bar represents the standard deviation 3.55 Mean Number of Gb3 Inclusions per PTC Baseline: The last available, non-missing observation prior to AVR-RD-01 infusion Note: With respect to Fabry disease, Gb3 inclusions per PTC is interchangeable with GL-3 inclusions per KIC FAB-201-1: First patient in FAB-201 clinical trial PTC: Peritubular Capillary; Gb3: Globotriaosylceramide; GL-3: Globotriaosylceramide; KIC: Kidney Interstitial Capillary FAB-201 FABRY PHASE 2
VCN/Diploid Genome - PBMCs Infuse AVR-RD-01 Day 0 Patient 1: Sustained response across multiple measures up to 22 months Drug Product VCN/dg: 0.7 KIDNEY FUNCTION remains within normal range at 12 mos. CARDIAC FUNCTION remains within normal range at 12 mos. *Source: https://www.kidney.org/atoz/content/gfr mGFR: Measured Glomerular Filtration Rate; eGFR: Estimated Glomerular Filtration Rate Source: Alfakih K et al, J Magn Reson Imaging, 2003 EF: Ejection Fraction; LV: Left Ventricular mGFR mL/min/1.73 m2 eGFR mL/min/1.73 m2 Baseline Month 12 Normal Range mGFR/eGFR Average 116* mL/min/1.73 m2 Male (20–39 years) Reference Range Mean Values ± SD 64.3 ± 4.2% 138.9 ± 24.5 g 67.8 ± 10.7 g/m2 Male (20–39 years) EF (%) LV Mass (Absolute) (g) LV Mass Index (Normalized) (g/m2) Baseline Month 12 FAB-201 FABRY PHASE 2 New data point VCN: Vector Copy Number; PBMCs: Peripheral Blood Mononuclear Cells Lyso-Gb3 Plasma Reference Value: 2.4 nM; Total Gb3 Plasma Reference Value: 4961 nM; 6012 nM before August 2018 (until Day 28 for Patient 1) Lyso-Gb3: Globotriaosylsphingosine; Gb3: Globotriaosylceramide Vector Copy Number (VCN) Lyso-Gb3 Plasma (nM) Total Gb3 Plasma (nM) Infuse AVR-RD-01 Day 0 Estimated Glomerular Filtration Rate Leukocyte AGA Activity (nmol/hr/mg protein) Plasma AGA Activity (nmol/hr/mL) Infuse AVR-RD-01 Day 0 Plasma AGA Missing Plasma AGA Analysis Leukocyte AGA Total Gb3 Lyso-Gb3 eGFR: Estimated Glomerular Filtration Rate Infuse AVR-RD-01 Day 0 New data points Plasma Lyso-Gb3 and Total Gb3 Leukocyte + Plasma AGA Enzyme Activity Lab A: Mayo Clinic Laboratories; Lab B: Rupar Laboratory; Lab A Leukocyte AGA Activity Reference Range: >23.1 nmol/hr/mg protein; Lab B Reference Range: 24–56 nmol/hr/mg protein; Plasma AGA Activity Reference Range: 5.1–9.2 nmol/hr/mL; AGA: α-galactosidase A
VCN/Diploid Genome - PBMCs Infuse AVR-RD-01 Day 0 Infuse AVR-RD-01 Day 0 Lyso-Gb3 Plasma (nM) Total Gb3 Plasma (nM) Patient 2: Sustained response across multiple measures up to 18 months Drug Product VCN/dg: 0.5 VCN: Vector Copy Number; PBMCs: Peripheral Blood Mononuclear Cells KIDNEY FUNCTION remains within normal range mGFR mL/min/1.73 m2 eGFR mL/min/1.73 m2 EF (%) LV Mass (Absolute) (g) LV Mass Index (Normalized) (g/m2) Baseline Month 12 Source: https://www.kidney.org/atoz/content/gfr mGFR: Measured Glomerular Filtration Rate; eGFR: Estimated Glomerular Filtration Rate Source: Maceira AM et al, J of Cardiovascular Magnetic Resonance, 2006 EF: Ejection Fraction; LV: Left Ventricular Reference Range Mean Values Male 40-49 years 58–75% 58–91 g/m2 Baseline Month 12 Normal Range mGFR/eGFR Average 99 mL/min/1.73 m2 Male (40–49 years) CARDIAC FUNCTION remains within normal range FAB-201 FABRY PHASE 2 – Cardiac Variant Total Gb3 Lyso-Gb3 New data point Lyso-Gb3 Plasma Reference Value: 2.4 nM; Total Gb3 Plasma Reference Value: 4961 nM; Note: Patient #2 has normal substrate, consistent with late-onset cardiac variant phenotype; Lyso-Gb3: Globotriaosylsphingosine; Gb3: Globotriaosylceramide Vector Copy Number (VCN) Plasma Lyso-Gb3 and Total Gb3 Leukocyte + Plasma AGA Enzyme Activity Leukocyte AGA Activity Reference Range: 24–56 nmol/hr/mg protein; Plasma AGA Activity Reference Range: 5.1–9.2 nmol/hr/mL; AGA: α-galactosidase A Leukocyte AGA Activity (nmol/hr/mg protein) Plasma AGA Activity (nmol/hr/mL) Infuse AVR-RD-01 Day 0 eGFR: Estimated Glomerular Filtration Rate Plasma AGA Leukocyte AGA Infuse AVR-RD-01 Day 0 Estimated Glomerular Filtration Rate New data points *1-year / “Month 12” = 48 weeks per protocol 108 - 185 g
VCN/Diploid Genome - PBMCs Infuse AVR-RD-01 Day 0 Infuse AVR-RD-01 Day 0 Lyso-Gb3 Plasma (nM) Total Gb3 Plasma (nM) Infuse AVR-RD-01 Day 0 Leukocyte AGA Activity (nmol/hr/mg protein) Plasma AGA Activity (nmol/hr/mL) FAB-201 FABRY PHASE 2 Vector Copy Number (VCN) VCN: Vector Copy Number; PBMCs: Peripheral Blood Mononuclear Cells Plasma Lyso-Gb3 and Total Gb3 Lyso-Gb3 Plasma Reference Value: 2.4 nM; Total Gb3 Plasma Reference Value: 4961 nM; Lyso-Gb3: Globotriaosylsphingosine; Gb3: Globotriaosylceramide Leukocyte + Plasma AGA Enzyme Activity KIDNEY FUNCTION remains within normal range Source: https://www.kidney.org/atoz/content/gfr mGFR: Measured Glomerular Filtration Rate; eGFR: Estimated Glomerular Filtration Rate Reference Range Mean Values Male 40-49 years 58–75% 58–91 g/m2 Normal Range mGFR/eGFR Average 99 mL/min/1.73 m2 Male (40–49 years) CARDIAC FUNCTION remains within normal range Baseline Month 12 mGFR mL/min/1.73 m2 eGFR mL/min/1.73 m2 EF (%) LV Mass (Absolute) (g) LV Mass Index (Normalized) (g/m2) Baseline Month 12 Drug Product VCN/dg: 1.4 Plasma AGA Leukocyte AGA Estimated Glomerular Filtration Rate eGFR (mL/min/1.73m2) Infuse AVR-RD-01 Day 0 Patient 3: Sustained response across multiple measures up to 1 year* New data point New data points New data points New data points *1-year / “Month 12” = 48 weeks per protocol Leukocyte AGA Activity Reference Range: 24–56 nmol/hr/mg protein; Plasma AGA Activity Reference Range: 5.1–9.2 nmol/hr/mL; AGA: α-galactosidase A Total Gb3 Lyso-Gb3 eGFR: Estimated Glomerular Filtration Rate 108 - 185 g Source: Maceira AM et al, J of Cardiovascular Magnetic Resonance, 2006 EF: Ejection Fraction; LV: Left Ventricular
FAB-201 FABRY PHASE 2 Patients 1-4: Leukocyte and plasma enzyme activity sustained up to 22 months Patient #4 dosed using plato® New data point Plasma AGA Activity (nmol/hr/mL) Leukocyte AGA Activity (nmol/hr/mg protein) Leukocyte AGA Activity Reference Range: 24–56 nmol/hr/mg protein; Plasma AGA Activity Reference Range: 5.1–9.2 nmol/hr/mL; AGA: α-galactosidase A Patient 1 Patient 2 Patient 3 Patient 4
Reduction from Baseline to Last Observation Patient 1 86% Patient 2 NA Patient 3 49% Patient 4 59% New data point Lyso-Gb3 Plasma Reference Value: 2.4 nM; Lyso-Gb3: Globotriaosylsphingosine Note: Patient #2 has normal substrate, consistent with late-onset cardiac variant phenotype FAB-201 FABRY PHASE 2 Patients 1-4: Plasma lyso-Gb3 reduction sustained up to 22 months Patient 1 Patient 2 Patient 3 Patient 4
FAB-201 FABRY PHASE 2 Patients 1-4: VCN stable up to 22 months Patient #4 dosed using plato® Patient 1 Patient 2 Patient 3 Patient 4 Drug Product VCN/dg Patient 1 0.7 Patient 2 0.5 Patient 3 1.4 Patient 4 1.6 New data point VCN: Vector Copy Number; PBMCs: Peripheral Blood Mononuclear Cells
Two AVR-RD-01 Fabry clinical trials PHASE 1 Investigator-Sponsored Trial* Patients Patients Key Objectives Key Objectives n = 5 (fully enrolled) On ERT > 6 months prior to enrollment 18 - 50 year-old males n = 8-12 (4 patients dosed to-date} Treatment-naive 16 - 50 year-old males Safety and preliminary efficacy Safety and efficacy PHASE 2 AVRO – FAB-201 Trial 9 patients dosed across Phases 1 and 2 FAB-201 = AVRO-RD-01-201 Study * Sponsored by FACTs team (Fabry Disease Clinical Research and Therapeutics) in Canada ERT: Enzyme Replacement Therapy
PATIENT 1 PATIENT 2 PATIENT 3 PATIENT 4 PATIENT 5 Age of symptom onset / diagnosis 18 / 37 years 9 / 29 years 10 / 0 years 7 / 4 years 10 / 14 years Years on ERT 11 years 6 years 4 years 11 years 2 years Age dosed with AVR-RD-01 48 years 39 years 40 years 37 years 30 years Mutation c.962A>G (p.Q321R) c.1033T>C (p.S345P) c.427G>C (p.A143P) c.427G>C (p.A143P) (p.Y134S) Primary disease signs and symptoms Kidney disease Cardiac disease GI pain GI diarrhea Angiokeratoma Insomnia Kidney disease Cardiomyopathy Hypohidrosis Corneal verticillata Peripheral neuropathy GI symptoms Angiokeratoma Lymphedema Acroparesthesia Cardiac Disease Tinnitus Headaches Dizziness Acroparesthesia Cardiac Disease Hypohidrosis Tinnitus Corneal verticillata Angiokeratoma GI symptoms Kidney disease Hypertension Hypohidrosis Tinnitus Migraines Impaired hearing Angiokeratoma Sleep apnea Asthma Depression Leukocyte AGA activity at baseline (nmol/hr/mg protein) 2.1* 1.1* 0.6* 2.2* 1.0* Plasma lyso-Gb3 at baseline (nM) 25** 26** 59** 29** 16** ERT discontinuation status 18 months after gene therapy dose Did not resume ERT after gene therapy dose 6 months after gene therapy dose Fabry Phase 1 Patient Characteristics ERT-Treated Fabry Patients * Rupar Lab, ref range 24-56 nmol/hr/mg ** Reference value ≤ 2.4 nM Note: AGA: α‑galactosidase A; ERT: Enzyme Replacement Therapy; GI: Gastrointestinal; Lyso-Gb3: Globotriaosylsphingosine
Gene Tx + Off ERT Gene Tx + ERT ERT No ERT Gene Tx Patient 1 Patient 2 Patient 3 Patient 4 Patient 5 26% reduction from baseline ERT OFF ERT 18.8 14.0 36.1 9.5 34.9 25.3 26.1 58.5 29.1 15.8 * As of July 21, 2020 Lyso-Gb3 Plasma Reference Value: 2.4 nM; Lyso-Gb3: Globotriaosylsphingosine; ERT: Enzyme Replacement Therapy; Tx: Therapy 47% reduction from baseline ERT ON ERT 38% reduction from baseline ERT OFF ERT 20% increase from baseline ERT OFF ERT 40% reduction from baseline ERT ON ERT Patients 1-5: Plasma lyso-Gb3 reduction sustained up to 32 months All patients who have discontinued ERT remain off ERT* FABRY PHASE 1 New data point
Leukocyte AGA Activity (nmol/hr/mg protein) Infuse AVR-RD-01 Day 0 Patient 1 Patient 2 Patient 3 Patient 4 Patient 5 FABRY PHASE 1 Leukocyte and plasma enzyme activity sustained up to 32 months with consistent trend across all other patients All 5 patients now out 1 year or more Plasma AGA Activity (nmol/hr/mL) Infuse AVR-RD-01 Day 0 New data point Leukocyte AGA Activity Reference Range: 24–56 nmol/hr/mg protein; Plasma AGA Activity Reference Range: 5.1–9.2 nmol/hr/mL; AGA: α-galactosidase A
Drug Product VCN/dg Patient 1 0.7 Patient 2 1.4 Patient 3 0.8 Patient 4 1.4 Patient 5 1.2 Note: 0.1 VCN is indicative of approx. 5-10% of all nucleated cells having an average of 1-2 copies of the transgene VCN: Vector Copy Number FABRY PHASE 1 Patients 1-5: VCN stable at 32 months with consistent trend across all other patients All 5 patients now out 1 year or more Infuse AVR-RD-01 Day 0 Patient 1 Patient 2 Patient 3 Patient 4 Patient 5 New data point
Annualized eGFR slope of ERT-treated patients** Sources: *Schiffmann R et al, Nephrol Dial Transplant, 2009 (Table 4); ** Rombach SM et al, Orphanet J Rare Dis 2013 (Table 2) eGFR declines in natural history and on ERT Classic Fabry male literature eGFR data eGFR: Estimated Glomerular Filtration Rate; UP: Urinary Protein Natural history annualized eGFR slopes of treatment naïve patients* slope:-3.4; n=30 slope:-6.9; n=22 slope:-3.3; n=21 slope:-1.6; n=18 Baseline UP: < 0.1 g/24hr 0.1-1.0 g/24hr > 0.1 g/24hr
Kidney function stable across Phase 1 and Phase 2 trials, up to 32 months* FABRY PHASE 1 & 2 New data points eGFR: Estimated Glomerular Filtration Rate * Eight of nine patients stable; other patient entered trial with more advanced kidney disease and a baseline eGFR level <50. As expected, this patient has not stabilized, and the patient remains on ERT. Normal Kidney Function Severe CKD Moderate CKD Mild CKD Fabry Phase 2 Patients Fabry Phase 1 Patients
26 Anti-AGA antibodies Anti-AGA antibody titers observed in 4 patients in the Phase 1 trial and 2 patients in FAB-201. We believe none of these are of clinical significance. AEs and SAEs reported Phase 1 Fabry (5 patients) and FAB-201 (4 patients) No unexpected safety events or trends identified No SAEs related to AVR-RD-01 drug product Phase 1 AEs (n = 100): Generally consistent with myeloablative conditioning, underlying disease or pre-existing conditions Phase 1 SAEs (n = 2): Febrile neutropenia (grade 3) Thrombophlebitis (grade 2) Note: Safety data cut off April 23, 2020 AE: Adverse Event; SAE: Serious Adverse Event NOTE: AVR-RD-01 is an investigational gene therapy FAB 201 AEs (n = 91): Generally consistent with myeloablative conditioning, underlying disease or pre-existing conditions Grade 1 or 2 (n = 74) Grade 3 or 4 (n = 17) FAB 201 SAEs: (n = 6) Pre-treatment and prior to conditioning Seizure (grade 2) Post-treatment Dehydration, nausea, vomiting (grade 3) Febrile neutropenia (2 patients, grade 3 & 4) Culture negative fevers (grade 2) Mucositis (grade 2)
Fabry disease target product profile (T.P.P.) Potential attributes intended to support first-line use Fabry T.P.P. SAFETY No short or long-term safety complications Hard to reach compartments Kidney (podocytes) Heart Brain DURABILITY Life-long ALL PATIENT SEGMENTS No restrictions on pre-existing antibodies to: Gene therapy Enzyme in previously ERT-treated patients Adult and pediatric patients No mutation exclusions EFFICACY DISTRIBUTION 24/7 production of enzyme CONVENIENCE Single dose therapy ERT: Enzyme Replacement Therapy Note: Potential attributes represent desired target product profile, and are not intended, and should not be interpreted, to be attributes of AVROBIO’s current investigational gene therapies, which are being studied for safety and efficacy and have not been approved by the FDA or any other regulatory body.
Sean Ring VP, Head of Commercial Operations Jose Gomez SVP, Global Market Access & Value Building commercial capabilities 44+ product launches, including 1 gene therapy Holly May Chief Commercial Officer Ramesh Arjunji VP, Global Health Economics and Outcomes Research / Value Demonstration Led commercial teams for LSDs at SanofiGenzyme Head of Commercial at SOBI, a rare disease company Led global strategic marketing and global market access functions at AveXis Led market access, global strategic pricing and reimbursement functions for LSDs at Shire Extensive orphan drug commercial strategy and launch expertise Built out market development and commercial ops at Editas, Zafgen, Cubist, Shire, Biogen Led value demonstration for insurers globally at AveXis Significant access and reimbursement responsibilities at leading global biotech companies
Cystinosis AVR-RD-04
Goals for gene therapy in cystinosis UNMET NEEDS: Kidney function Unmet needs: renal Fanconi syndrome, proteinuria, chronic kidney disease, kidney failure Vision Unmet needs: corneal cystine accumulation, photophobia, involuntary eyelid closure CNS complications Unmet needs: myopathy, hypotonia, tremors, difficulty swallowing, neurodevelopmental issues (speech and walking delay and cognitive impairment) Endocrine disorders Unmet needs: softening/weakening of bones, bone pain, rickets, long bone deformations, hypophosphatemia, delayed growth, hypothyroidism, pancreatic insulin insufficiency, diabetes, infertility Everyday burden of illness and life expectancy Unmet needs: medications multiple times per day that cause GI discomfort and sulfur body and breath smell, shortened lifespan Sources: Ariceta G et al, Nephrol Dial Transplant, 2015; Elmonem M et al, Orphanet Journal of Rare Diseases, 2016; Gahl et al, NEJM, 2002; Bois et al, J Med Genet, 1976 CNS: Central Nervous System; GI: Gastrointestinal
NORMAL LYSOSOME CYSTINOSIS LYSOSOME Cystinosis caused by defective gene that encodes cystinosin, an exporter protein Cysteine (monomer of cystine) Cystine (dimer) Functional exporter protein (Cystinosin) Defective exporter protein (Cystinosin) Cystine crystals Cystine crystals build up in lysosomes causing tissue and organ damage Source: Cherqui et al, Nat Rev Nephrol. 2017
Macrophages with CTNS transgene restore cystine recycling to CTNS-ve cells via: Tunneling nanotubes – transfer of corrected lysosomes, cystinosin, CTNS mRNA Exosomes / Microvesicles – transfer of cystinosin, CTNS mRNA Net result: Corrected lysosomes in cells throughout the body Mechanisms of action Drug product-derived macrophages restore normal cystine recycling NORMAL LYSOSOME CYSTINOSIS LYSOSOME Nanotube Sources: Naphade, Stem Cells, 2015. Harrison, Molecular Therapy, 2013. CTNS: cystinosin, lysosomal cystine transporter; mRNA: Messenger Ribonucleic Acid Exosomes Microvesicles
Allogeneic transplant demonstrated stabilized renal function, corrected polyuria and improved photophobia Elmonem M A et al, Am. J. Transplant, 2018; HSC: Hematopoietic Stem Cell; HLA: Human Leukocyte Antigen; GvHD: Graft vs Host Disease Allogenic HSC Transplant University Hospital Leuven 16 year old male Diagnosed at 2.7 years old, started on cysteamine Age 15 years – cysteamine toxicity Age 16 years – fully matched HLA transplant Acute GvHD First few months Kidney function stabilized Polyuria resolved 6 months Photophobia score reduced from 5 (unable to open eyes even inside dark room) to 0 (no photophobia) Cystine crystal reduction (31%) in macrophages in gastric mucosa at 30 months post transplant BEFORE TRANSPLANT 30 MONTHS POST TRANSPLANT Arrows/arrowheads point to tissue macrophages
Investigator-sponsored* study of AVR-RD-04 in cystinosis patients Patients Key Objectives Up to 6 patients Adults and adolescents Cohorts 1-2 ≥18 years; Cohort 3 ≥14 years Male and Female On oral and ophthalmic cysteamine Safety and efficacy PHASE 1/2 Investigator-Sponsored Trial* * Sponsored by University of California, San Diego Note: AVR-RD-04 aka CTNS-RD-04 Two patients dosed
PATIENT 1 Age of symptom onset / diagnosis 0 year / 8 months Age dosed with AVR-RD-04 20 years Gender Male Mutation Allele 1: LDM1 Allele 2: Nt1035 (insC) Primary disease signs and SoC treatment related symptoms, including Fanconi syndrome Polyuria Corneal abnormalities Mild photophobia Vomiting Granulocyte Cystine levels at baseline (nmol half cystine per mg protein)* 7.8 Comments NO kidney transplant Cysteamine 1125 mg p.o. every 12 h/day since 2009; discontinued prior to AVR-RD-04 infusion Cysteamine eyedrops 4-5x/day Concomitant medications not listed Cystinosis AVR-RD-04 Phase 1/2 Patient Characteristics Note: AVR-RD-01 aka CTNS-RD-04
No SAEs reported No AEs or SAEs related to AVR-RD-04 drug product AEs reported Consistent with myeloablative conditioning and underlying disease N = 22 (moderate = 9, mild = 13) Phase 1/2 Cystinosis No unexpected safety events or trends identified Note: Safety database cut as of January 27, 2020 for first patient dosed in the trial AE: Adverse Event; SAE: Serious Adverse Event Post-treatment (n = 16, not all events listed) Alopecia, intermittent diarrhea, vomiting Mucositis, intermittent febrile neutropenia, intermittent epistaxis Intermittent blurry vision, intermittent hypokalemia, mucoceles Thrombocytopenia Pre-treatment and prior to conditioning (n = 6, not all events listed) Diarrhea, hypokalemia, dizziness Dehydration, vomiting
Patient 1: Initial data indicate positive trends across multiple measures BIOMARKER ENDPOINTS VCN (vcn/dg) (Drug Product = 2.1) 1 Month 2.9 2 Months 3.0 3 Months 2.0 CLINICAL LAB MEASURES 1.3 1.5 1.5 Asymptomatic Heterozygous Carrier Granulocyte Cystine Range: 0.2 – 1 .9 µmol half cystine/g protein Source: Gertsman I et al., Clinical Chemistry, 2016 VCN: Vector Copy Number; CTNS: Cystinosin, Lysosomal Cystine Transporter; mRNA: Messenger Ribonucleic Acid; eGFR: Estimated Glomerular Filtration Rate; SCr: Serum Creatinine *Data obtained using a novel experimental methodology utilizing in vivo confocal microscopy, to image crystals in the skin behind the ear Urine Volume 24 Hour Urine Volume in L Kidney Function Levels of Cystine in Skin* μm3 Experimental in vivo confocal microscopy Two skin areas, behind the ear and ‘optional’, averaged Analysis and quantification (3D Image-Pro software) Serum Creatinine (mg/dL) normal range: 0.7-1.2 eGFR (mL/min/1.73m2) normal range: >90 2,187 1,493 Average Granulocyte Cystine Level (µmol half cystine/g protein) Baseline 7.8 1 Month 1.3 2 Months 1.5 3 Months 1.5 CYSTINOSIS PHASE 1/2 52 40 38 2.2 2.1 1.6 4.1 2.6
(max per day) OFF Cysteamine ON Cysteamine After Gene Therapy (at 6 months post-gene therapy) Before Gene Therapy 52 20 Number of Medications and Supplements NOTE: Investigational gene therapy CYSTINOSIS PHASE 1/2 Patient 1: Reduced treatment burden at 6 months
Gaucher Disease AVR-RD-02
Goals for gene therapy in Gaucher Type 1 Disease UNMET NEEDS: Bone-related manifestations Unmet needs: bone pain, avascular necrosis, bone crisis, osteoporosis, fractures, joint destruction, skeletal abnormalities Hemoglobin levels and platelet counts Unmet needs: anemia, thrombocytopenia, easy bruising, bleeding Hepatosplenomegaly Unmet needs: enlarged liver, enlarged spleen CNS complications Unmet needs: Increased risk of GBA-Parkinson’s disease Everyday burden of illness, and life expectancy Unmet needs: fatigue, pain, lung disease, biweekly infusions, shortened lifespan Sources: Grabowski G et al, Online Metabolic and Molecular Bases of Inherited Disease, 2018; Weinreb N et al, AJH, 2008; Pastores G et al, Semin Hematol, 2004 CNS: Central Nervous System; GBA: gene coding for glucocerebrosidase
Incomplete therapeutic response is common: 60% of patients failed to achieve at least one of the six therapeutic goals evaluated after 4+ years of ERT1 A clinically significant percentage of patients continue to exhibit bone pain, organomegaly and cytopenia after 10 years of ERT2 25% of patients continue to suffer from physical limitations after two years of ERT, primarily due to bone disease3 Persistence after 10 years ERT† Non-splenectomized Patients Splenectomized Patients Anemia 12.4% 8.8% Thrombocytopenia* 22.7% 0.7% Splenomegaly* 38.3% N/A Hepatomegaly* 14.3% 18.8% Bone Pain 42.9% 62.5% Bone Crisis 7.4% 16.7% * Higher persistence rates observed when more severe manifestations were present at baseline † Persistence refers to the presence of anemia, bone pain, bone crisis, or at least moderate thrombocytopenia, splenomegaly, or hepatomegaly, present after 10 years of ERT among those with baseline involvement of these parameters (from a registry of 757 GD1 patients; Weinreb et al., 2013). Following 10 years of treatment, ~26% of patients were receiving between 45-150 U/kg EOW, and 96% of these individuals were receiving doses between 45-90 U/kg EOW. Despite standard-of-care ERT, disease progression continues and unmet need remains. GD1: Gaucher Disease Type 1; SOC: Standard of Care; ERT: Enzyme Replacement Therapy; EOW: Every Other Week Sources: 1Weinreb N et al. Amer J Hematol, 2008; 2Weinreb N et al. J Inherit Metab Dis, 2013; 3Giraldo P et al. Qual Life Res, 2005. Long-term follow-up study highlights significant unmet need in Gaucher Type 1
GuardOne: Phase 1/2 study in Gaucher Type 1 patients Patients Key Objectives n = 8 - 16 Type 1 Gaucher Treatment naïve or on ERT 16 - 35 year-old Male and Female Safety, Engraftment, Efficacy, ERT-independence PHASE 1/2 AVR-RD-02 Trial GAU-201: AVR-RD-02 Study; ERT: Enzyme Replacement Therapy First patient dosed
Pompe disease AVR-RD-03
Goals for gene therapy in Pompe Disease TO PREVENT OR IMPROVE: Pulmonary function Unmet needs: respiratory insufficiency, chronic respiratory infections, sleep apnea, artificial ventilation Physical endurance and strength Unmet needs: proximal myopathy, progressive muscle weakness in diaphragm, trunk and lower limbs, wheel-chair bound CNS complications Unmet needs: neuromuscular control, reduction in executive function, cognitive impairment GI complications Unmet needs: macroglossia (childhood onset), difficulty chewing and swallowing, GI symptoms, including irritable bowel-like symptoms Everyday burden of illness, and life expectancy Unmet needs: fatigue, hepatomegaly, independent living, biweekly infusions, shortened lifespan Sources: Barba-Romero M et al, Rev Neurol, 2012; Dasouki M et al, Neurol Clin, 2014; Hagemans M et al, J Neurol, 2007; Musumeci O et al, Eur J of Neurol, 2018
Pompe lentiviral gene therapy program advancing Integrated three-part approach GILT: Glycosylation-Independent Lysosomal Targeting Sources: Burton B et al, J Pediatr, 2017; Ausems M et al, Eur J Hum Genet, 1999; Gungor D et al, Orphanet J Rare Dis, 2011; Maga JA et al, J of Bio Chem, 2013; Bartelink, Lancet Haematol, 2016. THE CHALLENGE Pompe requires 20x more ERT than Fabry or Gaucher Requires GAA activity restored to muscle and CNS AVROBIO’s APPROACH Potent transgene promoter GILT uptake tag Bu90-TDM for CNS impact mg Glycogen / g wet tissue 2 4 6 8 10 12 Dose mg/kg 0 5 10 15 20 HEART GILT-rhGAA rhGAA mg Glycogen / g wet tissue 2 4 6 8 10 12 Dose mg/kg 0 5 10 15 20 DIAPHRAGM GILT-rhGAA rhGAA GILT-tagged Recombinant Human (rh)GAA impacts levels of stored glycogen compared to non GILT-tagged Recombinant Human (rh)GAA in a Pompe mouse model
Wild type Glycogen KO Bu NT WT NT 2984 Bu 7.5 P<0.0001 9 Gy GAA 2983 2984 Diseased GILT and GILT mutant v1 reduce glycogen by >99% in heart GAA * P<0.01 ** P<0.001
WT KO 2984 Bu NT NT Bu 7.5 9 Gy NS *** *** Glycogen and GILT and GILT mutant v1 similar to wildtype mice GILT tag is essential for glycogen clearance in CNS WT GAA KO 2984 2983 Cerebrum *** P<0.001 Spinal cord GAA 2983 2985 2986 2987 2988 3007 3006 2989 Glycogen
plato® –– AVROBIO’s foundation designed to scale gene therapy worldwide State-of-the-art technologies including automated manufacturing platform Redefines manufacturing best practices Optimized for performance
plato® : Three upgrades designed to optimize potency, safety and durability UPGRADES Increase enzyme activity Increase transduction efficiency Increase VCN Increase marrow space / engraftment Increase consistency and safety 1 | Vector 2 | Conditioning 3 | Automation Upgrades designed to increase Vector Copy Number (VCN), enzyme activity, chimerism and durability * * TDM (therapeutic drug monitoring)
VCN Transduction Efficiency VECTOR UPGRADE: Metrics compared to academic process plato® UPGRADE 1 (per diploid genome) PATIENT 1 PATIENT 2 PATIENT 3 PATIENT 4 (%) PATIENT 1 PATIENT 2 PATIENT 3 PATIENT 4 (nmol/hr/mL) Enzyme Activity PATIENT 1 PATIENT 2 PATIENT 3 PATIENT 4 Mean = 4.8 2.2x Increase vs. Mean Mean = 0.9 1.8x Increase vs. Mean Mean = 23.3 2.2x Increase vs. Mean FAB-201 FAB-201 FAB-201 VCN: Vector Copy Number; FAB-201: AVR-RD-01 Study NOTE: Data is from drug product FAB-201 patient #4 drug product data with plato®
VECTOR UPGRADE: Metrics compared to academic process plato® UPGRADE 1 VCN (per diploid genome) PATIENT 1 PATIENT 2 PATIENT 3 PATIENT 4 PATIENT 1 Transduction Efficiency (%) PATIENT 1 PATIENT 2 PATIENT 3 PATIENT 4 PATIENT 1 FAB-201 CYS-101 FAB-201 CYS-101 FAB-201 with plato™ 4-plasmid vector (LV2) Bu TDM conditioning Automated manufacturing AVR-RD-04 with “plato™-like” 4-plasmid vector Bu TDM conditioning Manual manufacturing 1.8x Increase vs. Mean 2.2x Increase vs. Mean 3.3x Increase vs. Mean* 2.2x Increase vs. Mean* Mean = 0.9 Mean = 23.3 BU TDM: Busulfan Therapeutic Drug Monitoring; VCN: Vector Copy Number; FAB-201: AVR-RD-01 Study; CYS-101: AVR-RD-04 Study; LV: Lentiviral Vector Manufactured at UCLA using UCLA’s assays and methodologies NOTE: Data is from drug product FAB-201 and AVR-RD-04 drug product data
plato® UPGRADE 2 PRECISION CONDITIONING UPGRADE: Lowest rate of adverse events in the Bu90 range Optimized precision dosing designed to enhance tolerability Targeted busulfan intended to balance optimal engraftment with enhanced safety Adverse Event Probability Optimal Exposure 50 70 90 110 130 Busulfan Cumulative AUC (mg x hr/L) 0.0 0.2 0.4 0.6 0.8 Graft Failure Increased Toxicity Non-Malignant Disorders (n=465 patients) Meta-analysis of 465 patients identified optimal exposure Bu: Busulfan; AUC: Area Under the Curve Sources: Bartelink IH et al, Lancet Haematol, 2016
G-CSF: granulocyte colony stimulating factor; PERI-INFUSION PERIOD: time from infusion to discharge; TDM: therapeutic drug monitoring; HSC: hematopoietic stem cell Notes: Illustrative only. AEs will vary patient by patient, see busulfan label for a complete list of side-effects. Ambulatory care based on oncology setting with higher intensity conditioning PERSONALIZED CONDITIONING WITH PRECISION DOSING APHERESIS DRUG PRODUCT PERI-INFUSION PERIOD 2 clinic visits 10-12 hr clinic visits G-CSF IV Busulfan 3- 20 x 106 CD34+ cells/kg TDM BLOOD DRAWS To monitor neutrophil and platelet counts D 0 D -66 D -4 D -5 D -6 D -2 D -3 D -1 D 1 - 7 D 15 - 28 D -65 D -67 D -68 D -69 D -70 SHIPPED TO MANUFACTURER Plerixafor SubQ Ambulatory care occurring in close proximity to hospital 4 clinic visits DAILY SEQUENTIAL BLOOD DRAWS Age/Weight Informed Dose AUC Informed Dose AUC Informed Dose AUC Informed Dose STARTING DOSE: 3.2 mg/kg TARGET AUC: 90 mg•hr/L +/- 10% Anticonvulsant tablets BID HSC PRECISION CONDITIONING UPGRADE: Precision dosing via state-of-the-art patient therapeutic drug monitoring (TDM) plato® UPGRADE 2 Change in neutrophils Change in platelets G-CSF If needed, to increase neutrophil counts Platelet infusion If needed, to increase platelet levels Nausea, mucositis, diarrhea Fever, headache, asthenia Skin rash Hair thinning / loss MONITORING & MANAGEMENT OF POTENTIAL SIDE EFFECTS Side-effects typically peak over 2-4 days D 8 - 14
PRECISION CONDITIONING UPGRADE: Rapid neutrophil and platelet recovery with minimal lymphocyte depletion using Busulfan TDM plato® UPGRADE 2 Fabry: Patients #1-3 Melphalan 100mg/m2; Patient #4 Busulfan ‘AUC 90’; Cystinosis: Patient #1 Busulfan ‘AUC 90’ Threshold levels for prophylactic supportive care in HSC Tx; ANC <0.5 x 109 per liter (AABB); Platelets <10 X 109 cells/L (AABB) NOTE: Neutrophil counts - G-CSF administration post gene therapy: Pt 1: 7 Doses, Day 7 – 14, Pt 2: 11 Doses, Day 7 – 17, Pt 3: 6 Doses, Day 7 – 12, Pt 4: 5 Doses, Day 8 – 12 NOTE: Platelet counts - Platelet Transfusion: Pt 1: Day 10; Pt 2, 3: Day 11, Pt 4: no transfusion TDM = Therapeutic Drug Monitoring; G-CSF = Granulocyte-colony stimulating factor Cystinosis Patient 1: Busulfan Fabry Patients 1 – 3: Mel Fabry Patient 4: Bu90-TDM Absolute Neutrophil Count (ANC) Platelet Count Absolute Lymphocyte Count
BONE MARROW Potential for widespread microglia engraftment throughout the brain MICROGLIA PERIPHERAL TISSUE Mature Blood Cells Enzyme Neuron Microglia Enzyme Astrocyte Lymphocyte Granulocyte Bloodstream Monocyte Enzyme Macrophage Mature cells area Progenitors area HSC area Bone TRANSDUCED CD34+ CELLS Viscera CNS/PNS IN THE BONE MARROW Busulfan eliminates hematopoietic (CD34+) stem and progenitor cells making space for gene-modified cells BRAIN Busulfan crosses blood-brain barrier and eliminates resident microglia cells making space for gene-modified cells PRECISION CONDITIONING UPGRADE: Designed to access “hard-to-reach” compartments plato® UPGRADE 2
PRECISION CONDITIONING UPGRADE: Designed to access “hard-to-reach” compartments, including the brain Widespread engraftment in regions critical for cognitive, motor, olfactory, and visual function Engrafted microglia/microglia-like cells have comparable morphology and classical lineage markers with endogenous microglia GFP: Marker of engrafted cells Iba1: Marker of microglia cells DAPI: Nuclear stain irrespective of cell type MRI: 54 year old with Fabry disease demonstrating white matter lesions (WMLs) Global microglial coverage of mouse brain at 4 months post gene-modified HSC transplantation 2 plato® UPGRADE Source: Buechner S, J. Neurol, Neurosurg, Psychiatry, 2008 MRI: Magnetic Resonance Imaging; ERT: Enzyme Replacement Therapy; WMLs: White Matter Lesions; HSC: Hematopoietic Stem Cell
AUTOMATION UPGRADE: Automated, scalable manufacturing system Expanded Scale Potential to reach thousands of patients per year Broader Reach Portable platform designed for flexible global production using low grade clean rooms High Quality Automated, closed system designed to improve quality and consistency Enhanced Convenience Cryopreservation simplifies logistics and patient scheduling Lower Costs Designed to create efficiencies in vector design / scalable cell and vector production 3 plato® UPGRADE Designed to elevate quality and overcome historic CMC bottlenecks
Drug product production Scalable, global production suites Frozen in aliquots to streamline supply chain CD 34+ hematopoietic stem cells Vector production Large bioreactor 200 liter serum-free suspension culture Automated, closed system Vector with disease-specific transgene INCREASE CONSISTENCY HIGH VOLUME / TITRE 1 2 3 COST-EFFECTIVE SCALE-OUT Cryopreserved to enable convenient dosing Illustrative * AUTOMATION UPGRADE: Designed to deliver large-scale manufacturing 3 plato® UPGRADE * European manufacturing capabilities planned for 2H 2020; manufacturing capabilities currently in place in U.S. & Australia Differentiated, cost-effective approach
AUTOMATION UPGRADE: Global manufacturing established Automated systems operational in 3 sites with 4th in progress plato® UPGRADE 3 U.S. Operational U.S. Operational Australia Operational Europe In progress
DRUG PRODUCT VECTOR (200 L scale bioreactor runs (109 titre)) 4 production suites ~12 runs per year per suite ~50 patients per run 2,400 PATIENTS ANNUALLY 3 global production suites 8 automated units per suite 100 patients per unit per year 2,400 PATIENTS ANNUALLY Illustrative AUTOMATION UPGRADE: Poised to manufacture at scale plato® UPGRADE 3 Designed to optimize potency and safety, and overcome historic CMC bottlenecks
2.9 1.2 0.9 6.1 3.7x Increase vs. Mean 3 UPGRADES IN PLACE: plato® metric compared to academic process plato® UPGRADE 1, 2, 3 FAB-201: AVR-RD-01 Study FAB-201 SIX MONTH data for patient #4 with plato® vs. patients #1-3 (nmol/hr/mL) Plasma Enzyme Activity Mean = 1.64 (nmol/hr/mg protein) Leukocyte Enzyme Activity 5.1x Increase vs. Mean Mean = 19.8 27.5 18.9 13.0 101.5 New data point
Milestones anticipated across the pipeline in 2020 FABRY Continue recruitment in FAB-201 Phase 2 clinical trial Continue to report patient data across Phase 1 and Phase 2 clinical trials GAUCHER Continue recruitment in GuardOne Phase 1/2 clinical trial Report initial patient data in H2 2020 Continue recruitment in investigator-sponsored Phase 1/2 clinical trial Continue to report patient data CYSTINOSIS AVROBIO to hold first R&D Day in Q4 2020 POMPE Complete preclinical IND-enabling activities * For additional information, see the Company’s Quarterly Report on Form 10-Q filed with the SEC on August 6, 2020. Clinical activities and timelines subject in all respects to ongoing and evolving COVID-19 pandemic*
Appendix
Hematopoietic reconstitution occurs in two distinct phases A few thousand long-term engrafting cells stably sustain levels of transgene product First wave of short-term progenitor cells start to exhaust with progressive takeover by a smaller population of long-term engrafting cells Source: Biasco L et al, Cell Stem Cell, 2016 Clonal Population Time after GT (months) 6 - 12 24 - 48 0 - 3 Long-term engrafting cells Short-term progenitor cells
Precedent for use of kidney biopsy data for FDA approval of drug candidate for Fabry disease Classic Fabry disease (AGA activity <1%) NOTE: For informational purposes; differences exist between trial designs and subject populations; AVROBIO has not conducted any head-to-head trials comparing migalastat to AVR-RD-01 Classic Fabry patient level data 0-6 months randomized clinical trial and 6-12 months open label extension 28% average reduction (at 6 months from baseline) 46% average reduction (average of patients with 12 month data) 7/9 males ≥ 50% reduction (at 6 months from baseline) 45 Amenable patients* (16 males / 29 females) Migalastat approved on % reduction in GL-3 inclusions per KIC as compared to placebo Group Migalastat (BL –M6) Placebo (BL –M6) Males (N=16) 5/7 (71%) -1.10 (-1.94, -0.02) 4/9 (44%) -0.03 (-1.00, 1.69) Patients with baseline GL-3 ≥ 0.3 (N=17; 9 males, 8 females) 7/9 (78%) -0.91 (-1.94, 0.19) 2/8 (25%) -0.02 (-1.00, 1.69) Patients with baseline GL-3 < 0.3 (N=28; 7 males, 21 females) 6/16 (38%) -0.02 (-0.10, 0.26) 7/12 (58%) -0.05 (-0.16, 0.14) Treatment Group n Baseline Median (min, max) Month 6 Median (min, max) Change from Baseline Median (min, max) Average number of GL-3 inclusions per KIC (N=13) Galafold 7 3.6 (0.2, 6.0) 2.6 (0.1, 6.0) -0.7 (-1.7, 1.2) Placebo 6 1.8 (0.1, 2.8) 2.0 (0.05, 4.3) -0.04 (-0.5, 1.5) Male Patients with the Classic Phenotype Migalastat (Months 0-24) Placebo (Months 0-6) → Migalastat (Months 6-24) #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 PTC GL-3 inclusions at BL 0.16 0.03 n/a 5.69 1.22 n/a 2.88 2.41 1.55 0.16 0.03 0.11 0.94 0.88 Change in PTC GL-3 inclusions from BL to M6 -0.08 0.01 n/a -1.77 -1.10 n/a -1.25 1.21 -0.21 0.01 0.09 -0.07 1.94 -0.83 Change in PTC GL-3 inclusions from BL/M6b to M12 -0.12 n/a n/a -1.92 n/a n/a -0.81 -0.94 -1.13 -0.09 -0.05 n/a -2.28 0.06 Source: Germain D et al, Genetics in Medicine, 2019
Reduction of pre-existing anti-ERT drug IgG antibodies following AVR-RD-01 Suggests potential as a therapeutic option independent of pre-existing antibodies San Raffaele Telethon Institute for Gene Therapy (SR-TIGET) Change in pre-existing antibodies reported for Hurler disease (MPS-1) Ex vivo LV-CD34+ gene therapy with conditioning N = 6 Evaluable patients (5/6) demonstrated sustained, supraphysiologic blood IDUA activity 4/5 prior ERT (rhIDUA) exposure (5-28 months) 4/5 pre-existing ERT-induced IgG antibodies 6/6 anti-rhIDUA IgGs undetectable 2 months post gene therapy Source: Gentner B et al., Blood, 2019 Similar Results Observed in Other Studies FABRY PHASE 1 Fabry Disease Phase 1 IgG Antibody Titer ERT: Enzyme Replacement Therapy; IgG: Immunoglobulin G; MPS-1: Mucopolysaccharidosis Type 1; IDUA: Iduronidase: SR-TIGET: San Raffaele Telethon Institute for Gene Therapy; LV: Lentiviral; rhIDUA: Recombinant Human alpha-L-Iduronidase Patient 1 Patient 2 Patient 3 Patient 4 Patient 5 IgG Antibody Titer Infuse AVR-RD-01 Day 0 Negative Control Positive Control ~ ~
Fully Automated Bu-TDM Immunoassay AVROBIO and Saladax announced agreement to develop and validate Saladax’s fully automated nanoparticle immunoassay kit Designed to work on most automated hospital analyzers Regular technician, 24/7 analysis possible with results anticipated in minutes using only microLs of blood Designed to analyze 10-100s samples per machine/hour Expected to eliminate Bu degradation errors as assay conducted in real-time at the point of care Scalable New collaborations advancing leadership in lentiviral gene therapy Antibody-Drug Conjugate AVROBIO and Magenta announced research & clinical collaboration agreement to evaluate Magenta’s preclinical CD117-targeted antibody conjugate to amanitin (MGTA-117) in conjunction with AVROBIO investigational gene therapies Designed to deplete only hematopoietic stem and progenitor cells Has shown promising data in non-human primates MGTA-117 currently in IND-enabling studies Each party retains commercial rights to its own programs