ADI-001 Clinical Biomarker Data Demonstrate Robust Tissue Trafficking and Complete B Cell Depletion in Secondary Lymphoid Tissue

Rhea-AI Summary

Adicet Bio (Nasdaq: ACET) has announced promising clinical biomarker data for ADI-001 from the Phase 1 GLEAN trial, reinforcing its potential as a best-in-class allogeneic cell therapy for autoimmune diseases. Key findings include:

1. Robust tissue trafficking with high levels of ADI-001 in secondary lymphoid tissue
2. Significant chimeric antigen receptor (CAR) T cell activation
3. Complete CD19+ B cell depletion in secondary lymphoid tissue

The data shows superior exposure of ADI-001 in secondary lymphoid tissue compared to published third-party data for alpha-beta CAR T therapies. Adicet is advancing ADI-001 clinical programs in various autoimmune conditions and expects to report initial clinical data in the first half of 2025.

Positive

• ADI-001 demonstrated significant levels of CAR T cell activation and tissue exposure in lymph node biopsies
• Complete depletion of CD19+ B cells within analyzed secondary lymphoid tissue was observed
• ADI-001 showed superior exposure in secondary lymphoid tissue compared to alpha-beta CAR T therapies
• The company is advancing ADI-001 clinical programs in multiple autoimmune conditions

Negative

• None.

Medical Research Analyst

The clinical biomarker data for ADI-001 presents a significant advancement in allogeneic cell therapy for autoimmune diseases. The key findings include:

• Robust tissue trafficking with high levels of ADI-001 in secondary lymphoid tissue
• Complete CD19+ B cell depletion in secondary lymphoid tissue
• Mean exposure of 236,701 CAR T cells per million across all dose levels
• 27-64% of total cellular material detected at the 1E9 dose

These results surpass previously reported levels for autologous alpha-beta CAR T therapies, indicating a potential breakthrough in treating autoimmune conditions. The complete B cell depletion in tissues, where CD20-targeted antibodies have failed, suggests ADI-001 could offer superior efficacy in managing autoimmune diseases like lupus and systemic sclerosis.

Biotechnology Expert

Adicet Bio's ADI-001 demonstrates promising potential in the competitive landscape of allogeneic cell therapies. The robust tissue trafficking and complete B cell depletion in secondary lymphoid tissue are particularly noteworthy. This off-the-shelf gamma delta CAR T cell platform may offer several advantages:

• Potential for improved efficacy in autoimmune diseases
• Broader applicability across various conditions
• Possibly reduced manufacturing complexity compared to autologous therapies

However, it's important to note that these are early-stage results. The true clinical impact and safety profile will become clearer with the upcoming clinical data expected in the first half of 2025. Investors should monitor the progress of ADI-001 in multiple indications, including lupus nephritis and systemic sclerosis, as positive results could significantly boost Adicet Bio's market position.

Financial Analyst

From a financial perspective, these promising results for ADI-001 could have significant implications for Adicet Bio (NASDAQ: ACET):

• Potential market expansion into multiple autoimmune indications
• Increased investor interest and potential partnerships
• Possible competitive advantage in the allogeneic cell therapy space

However, it's important to note that the company is still in the clinical stage, with initial clinical data expected in H1 2025. This timeline suggests a considerable period before potential commercialization and revenue generation. Investors should consider the company's cash position and burn rate to assess its ability to fund ongoing research and development. While the news is positive, the long-term financial impact remains uncertain and dependent on future clinical results and regulatory approvals.

-Results highlight ADI-001's potential as a best-in-class allogeneic cell therapy for autoimmune disease-

-Webcast featuring Dr. Blake Aftab with accompanying presentation available on Company website-

REDWOOD CITY, Calif. & BOSTON--(BUSINESS WIRE)-- Adicet Bio, Inc. (Nasdaq: ACET), a clinical stage biotechnology company discovering and developing allogeneic gamma delta T cell therapies for autoimmune diseases and cancer, today announced ADI-001 clinical biomarker data from the Phase 1 GLEAN trial which further reinforces the potential of ADI-001 as a best-in-class allogeneic cell therapy for autoimmune diseases. Notably, ADI-001 demonstrated robust tissue trafficking resulting in high levels of ADI-001, significant chimeric antigen receptor (CAR) T cell activation, and complete CD19+ B cell depletion in secondary lymphoid tissue. These data will be presented by Dr. Blake Aftab, Chief Scientific Officer, at the 9th Annual CAR-TCR Summit on Thursday, September 19, 2024 in Boston, MA.

“These results clearly support the potential of ADI-001 and Adicet’s off-the-shelf gamma delta CAR T cell platform, by demonstrating robust trafficking and complete B cell depletion in tissue, while providing superior exposure of ADI-001 in secondary lymphoid tissue compared to published third-party data reported for alpha-beta CAR T therapies,” said Blake Aftab, Ph.D., Chief Scientific Officer of Adicet Bio. “Together, the totality of our findings provide multiple levels of evidence highlighting the significant advantages of our approach and present a compelling opportunity for ADI-001 to extend B cell targeting into tissues, as we look to address a range of autoimmune diseases in the clinic.”

A summary of the results is reported below:

• ADI-001 demonstrated significant levels of CAR T cell activation and tissue exposure in lymph node biopsies in the GLEAN trial, with a mean exposure of 236,701 CAR T cells per million across all dose levels, representing a range of 27-64% of total cellular material detected by ddPCR in evaluable biopsies at the 1E9 dose, and exceeding levels previously reported for patients who received autologous alpha-beta CAR T therapies. CAR T cells detected in tissues also demonstrated a robust activation profile, based on in situ detection of granzyme B.
• Recently published studies have demonstrated depletion of CD19+ plasmablasts, memory B cells and naïve B cells in peripheral blood using anti-CD20 targeted antibodies, however, these CD20-targeted antibody modalities failed to deplete B cells within secondary lymphoid tissues.
• Concurrent with ADI-001 tissue trafficking and activation, complete depletion of CD19+ B cells within analyzed secondary lymphoid tissue was also observed. These results support ADI-001’s potential for achieving complete B-cell depletion in peripheral blood and within tissues.

Adicet is advancing the ADI-001 clinical program in lupus nephritis, systemic lupus erythematosus, systemic sclerosis and anti-neutrophil cytoplasmic autoantibody associated vasculitis (AAV) and expects to report initial clinical data in the first half of 2025.

Company webcast information

A listen-only webcast with an accompanying presentation by Dr. Aftab is accessible under Presentations & Events | Adicet Bio in the Investors section of Adicet Bio’s website. The archived webcast will be available for 30 days.

About the GLEAN trial

The Phase 1 GLEAN study was an open-label, multi-center study of ADI-001 enrolling adults diagnosed with B-cell malignancies who have either relapsed, or are refractory to, at least two prior regimens.

About Adicet Bio, Inc.

Adicet Bio, Inc. is a clinical stage biotechnology company discovering and developing allogeneic gamma delta T cell therapies for autoimmune diseases and cancer. Adicet is advancing a pipeline of “off-the-shelf” gamma delta T cells, engineered with chimeric antigen receptors (CARs), to facilitate durable activity in patients. For more information, please visit our website at https://www.adicetbio.com.

Forward-Looking Statements

This press release contains "forward-looking statements" of Adicet within the meaning of the Private Securities Litigation Reform Act of 1995 relating to the business and operations of Adicet. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,”, “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. These forward-looking statements include, but are not limited to, express or implied statements regarding the potential safety, tolerability and efficacy of ADI-001 multiple autoimmune indications; the potential for ADI-001 to be best-in-class allogenic cell therapy for autoimmune diseases and differentiation from existing therapies; the clinical development of ADI-001 in lupus nephritis, systemic lupus erythematosus, systemic sclerosis and anti-neutrophil cytoplasmic autoantibody associated vasculitis; and the planned announcement of initial clinical data from ADI-001 in four autoimmune indications in the first half of 2025. Any forward-looking statements in this press release are based on management's current expectations and beliefs of future events, 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, including without limitation, the effect of global economic conditions and public health crises on the Company’s business and financial results, including with respect to disruptions to its preclinical and clinical studies, business operations, employee hiring and retention, and ability to raise additional capital; Adicet's ability to execute on its strategy including obtaining the requisite regulatory approvals on the expected timeline, if at all; that positive results, including interim results, from a preclinical or clinical study may not necessarily be predictive of the results of future or ongoing studies; that clinical studies may fail to demonstrate adequate safety and efficacy of Adicet’s product candidates, which would prevent, delay, or limit the scope of regulatory approval and commercialization; and regulatory approval processes of the U.S. Food and Drug Administration and comparable foreign regulatory authorities are lengthy, time-consuming, and inherently unpredictable; and Adicet’s ability to meet production and product release expectations. For a discussion of these and other risks and uncertainties, and other important factors, any of which could cause Adicet's actual results to differ from those contained in the forward-looking statements, see the section titled "Risk Factors" in Adicet's most recent Quarterly Report on Form 10-Q and subsequent filings with the U.S. Securities and Exchange Commission (SEC), as well as discussions of potential risks, uncertainties, and other important factors in Adicet’s other filings with the SEC. All disclosure under this press release is as of the date of this press release, and Adicet undertakes no duty to update this information unless required by law

View source version on businesswire.com: https://www.businesswire.com/news/home/20240919208645/en/

Adicet Bio, Inc.

Investor and Media Contacts

Investors:

Anne Bowdidge

abowdidge@adicetbio.com

Janhavi Mohite

Precision AQ

212-362-1200

janhavi.mohite@precisionaq.com

Media:

Kerry Beth Daly

kbdaly@adicetbio.com

Source: Adicet Bio, Inc.

FAQ

What are the key findings of ADI-001 in the Phase 1 GLEAN trial for ACET?

The key findings for ADI-001 in the Phase 1 GLEAN trial include robust tissue trafficking, significant CAR T cell activation, and complete CD19+ B cell depletion in secondary lymphoid tissue. These results demonstrate ADI-001's potential as a best-in-class allogeneic cell therapy for autoimmune diseases.

How does ADI-001's performance compare to other CAR T therapies for ACET?

ADI-001 showed superior exposure in secondary lymphoid tissue compared to published third-party data for alpha-beta CAR T therapies. It demonstrated significant levels of CAR T cell activation and tissue exposure in lymph node biopsies, with a mean exposure of 236,701 CAR T cells per million across all dose levels.

When does Adicet Bio (ACET) expect to report initial clinical data for ADI-001?

Adicet Bio expects to report initial clinical data for ADI-001 in the first half of 2025. The company is advancing ADI-001 clinical programs in lupus nephritis, systemic lupus erythematosus, systemic sclerosis, and anti-neutrophil cytoplasmic autoantibody associated vasculitis (AAV).

What is the significance of B cell depletion in ADI-001's performance for ACET?

Complete depletion of CD19+ B cells within analyzed secondary lymphoid tissue was observed with ADI-001. This is significant because recent studies have shown that CD20-targeted antibody modalities failed to deplete B cells within secondary lymphoid tissues, while ADI-001 achieved complete B-cell depletion in both peripheral blood and tissues.