Updated data show a second partial response in Part B
Overall response rate of 15.4% and disease control rate of 46% in Part B with durable clinical benefit in patients with prior disease progression
Preliminary data show disease control rate of 67% in first 3 patients in Part C, with ADXS-503 being dosed in combination with pembrolizumab in first line
“NSCLC patients resistant to PD-1/-L1 checkpoint inhibitors (CPIs) have limited treatment options. Current treatment guidelines allow for CPI re-challenge but the overall response rate (ORR) seen with this approach is below 10% and disease control rate (DCR) of up to 45%. Thus, it is encouraging to report that in Part B of the study, the documented ORR has now increased to 15.4 % and DCR has reached 46% in the first 13 evaluable patients treated with ADXS-503 as an add-on therapy at progression with pembrolizumab,” said Dr.
Dr.
Key Updates and Future Data Read-outs:
- In Part B of the study, 14 patients have been treated and 13 are evaluable with ADXS-503 as an add on therapy to patients failing pembrolizumab as last therapy with all of them evaluable for safety and efficacy
- Combination therapy was well tolerated with no dose-limiting-toxicity (DLT) or added toxicity of the two drugs. Grade 1 and 2, transient and reversible events included chills, fever, fatigue, in approximately half of the patients
- The ORR was 15.4% (2/13) and DCR was 46% (6/13)
- Clinical benefit was durable, with two partial responses (PR) sustained for 702 and 189 days, respectively, and 3 patients with stable disease (SD), sustained for 448, 175 and 117 days. Another patient with stable disease is still under evaluation
- Available data demonstrate that patients who achieve clinical benefit include those with PD-L1 expression ≥50%, secondary resistance disease to pembrolizumab and those who show proliferation and/or activation of NK and CD8+ T cells within the first weeks of therapy
- Additional translational studies, including flow cytometry, ELISPOT, cytokines/chemokine levels, mutational analysis, MSI TMB and cfDNA and their clinical correlates, will be presented at an upcoming medical meeting
- In Part C of the study, 3 patients with newly diagnosed NSCLC have been treated with ADXS-503 plus pembrolizumab. Treatment has been well tolerated and disease control rate thus far is 67%, with two patients sustaining stable disease for 332 and 94 days.
- Enrollment in Part B and Part C of the ongoing study will continue to further evaluate the clinical benefit and immune effects of adding on ADXS-503 to patients progressing on pembrolizumab
The Phase 1/2 clinical trial of ADXS-503 is seeking to establish the recommended dose, safety, tolerability and clinical activity of ADXS-503 administered alone and in combination with a KEYTRUDA® in approximately 50 patients with NSCLC, in at least five sites across the
About ADXS-503
ADXS-503 is a live attenuated Listeria monocytogenes (Lm)-based, off-the-shelf immunotherapy that is under clinical development as a single agent and in combination with other cancer therapies for the treatment of squamous and non-squamous non-small cell lung cancer (NSCLC). ADXS-503 is bioengineered to secrete an antigen-adjuvant fusion protein consisting of a truncated fragment of listeriolysin O (tLLO) fused to 22 NSCLC-associated tumor antigens. The proposed mechanism of action of Advaxis’ Lm-based immunotherapy is to stimulate both the innate and adaptive immune systems to initiate a coordinated antitumor response culminating in the generation of tumor antigen-specific T cells that are capable of infiltrating and destroying the tumor.
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This press release contains forward-looking statements that are made pursuant to the safe harbor provisions within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements are any statements that express the current beliefs and expectations of management, including but not limited to statements related to the expected clinical development of the Company’s drug product candidates, statements about the Company’s balance sheet position, and statements related to the goals, plans and expectations for the Company’s ongoing clinical studies. These and other risks are discussed in the Company’s filings with the SEC, including, without limitation, its Annual Report on Form 10-K, filed on January 22, 2021, and its periodic reports on Form 10-Q and Form 8-K. Any statements contained herein that do not describe historical facts are forward-looking statements that are subject to risks and uncertainties that could cause actual results, performance and achievements to differ materially from those discussed in such forward-looking statements. The Company cautions readers not to place undue reliance on any forward-looking statements, which speak only as of the date they were made. The Company undertakes no obligation to update or revise forward-looking statements, except as otherwise required by law, whether as a result of new information, future events or otherwise.
KEYTRUDA® is a registered trademark of Merck Sharp & Dohme Corp., a subsidiary of
Investor Contact
Tim@lifesciadvisors.com
(917) 679-9282
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