PDS Biotech Announces Preliminary Biomarker Study Results in Subset of Advanced HPV-Positive Head and Neck Cancer Patients at ESMO

• Combination of PDS0101 and KEYTRUDA^® appears to lead to changes towards a TH1 predominant cytokine profile reported to be associated with improved killer T cell activity
• Lowered CD8 T cells in peripheral blood after treatment align with previously reported CD8 T cell targeting and accumulation in tumors¹

PRINCETON, N.J., Oct. 23, 2023 (GLOBE NEWSWIRE) -- PDS Biotechnology Corporation (Nasdaq: PDSB) (PDS Biotech or the Company), a clinical-stage immunotherapy company developing a growing pipeline of targeted cancer immunotherapies and infectious disease vaccines based on the Company’s proprietary T cell activating platforms, today announced immune response data from a preliminary analysis of a subset of patients in VERSATILE-002, the Phase 2 clinical trial evaluating the safety and efficacy of PDS0101 in combination with Merck’s anti-PD-1 therapy KEYTRUDA^® (pembrolizumab) in patients with human papillomavirus (HPV)16-positive recurrent or metastatic head and neck squamous cell carcinoma (HNSCC). The data presented during the European Society for Medical Oncology Congress 2023 (ESMO Congress 2023) provided preliminary insight to the pre-existing immune responses in advanced HPV-positive HNSCC patients and potential changes to the immune profile after treatment.

“Generation of multifunctional, anti-tumor T cells with the relevant cytokine and chemokine profiles are necessary for effective long-term control of tumor growth and clinical outcomes. This initial study focused on understanding the immunological profile of advanced head and cancer patients in the blood,” said Kevin Harrington, PhD, Professor of Biological Cancer Therapies, The Royal Marsden. “This preliminary study suggests that PDS0101 may promote a TH1 predominant cytokine profile as well as induction of important T cell activating chemokines. Such studies could be helpful in providing further insight into how PDS0101 in combination with KEYTRUDA^® alters T cell cytokine and chemokine profiles to promote improved clinical outcomes.”

The data presented at ESMO 2023 included 18 patients with a median age of 63 years (range 46-83) and all had confirmed HPV16-positive tumors. The immunological profiles were assessed at three timepoints: pre-treatment,12 (cycle 5), and 36 weeks (cycle 13) following four and five cycles of combination therapy, respectively.

Highlights of the analysis include:

• Combination of PDS0101 and KEYTRUDA^® appears to lead to changes towards a TH1 predominant cytokine profile reported to be associated with improved killer T cell activity
• Combination of PDS0101 and KEYTRUDA^® resulted in increased polyfunctionality reflected in T cells expressing 5 or more cytokines. Increased polyfunctionality is typically associated with enhanced killing function and anti-tumor activity

“This analysis provides preliminary insights into how PDS0101 in combination with KEYTRUDA^® may be impacting specific cytokines and chemokines in CD8 and CD4 T cell populations,” said Lauren V. Wood, MD, Chief Medical Officer of PDS Biotech. “The investigational combination appears to be promoting a predominant TH1 immunologic profile that is associated with decreases in CD8 T cells in peripheral blood. We are encouraged that these observations align with other Phase 2 studies reporting PDS0101-induced polyfunctional CD8 T cells traffic to tumors and we look forward to continued investigation in our VERSATILE-003 Phase 3 study.”

¹ Klopp A, et al. 2022. IMMUNOCERV, an ongoing Phase II trial combining PDS0101, an HPV-specific T cell immunotherapy, with chemotherapy and radiation for treatment of locally advanced cervical cancers. Presented at: Society for Immunotherapy of Cancer; November 8-12, 2022. Boston, MA. Abstract: 674.

About PDS0101
PDS0101, PDS Biotech’s lead candidate, is a novel investigational human papillomavirus (HPV)-targeted immunotherapy that stimulates a potent targeted T cell attack against HPV-positive cancers. PDS0101 is given by subcutaneous injection alone or in combination with other immunotherapies and cancer treatments. In a Phase 1 study of PDS0101 in monotherapy, the treatment demonstrated the ability to generate multifunctional HPV16-targeted CD8 and CD4 T cells with minimal toxicity. Interim data suggests PDS0101 generates clinically active immune responses and the combination of PDS0101 with other treatments can demonstrate significant disease control by reducing or shrinking tumors, delaying disease progression, and/or prolonging survival. The combination of PDS0101 with other treatments does not appear to compound the toxicity of other agents.

About VERSATILE-002
VERSATILE-002 is a single-arm Phase 2 trial evaluating the safety and efficacy of PDS0101, an HPV16-targeted investigational T cell-activating immunotherapy that leverages PDS Biotech’s proprietary Versamune^® technology, in combination with Merck’s anti-PD-1 therapy, KEYTRUDA^® (pembrolizumab). The combination is being evaluated in immune checkpoint inhibitor (ICI)-naïve and ICI-refractory patients with recurrent/metastatic HPV16-positive head and neck squamous cell carcinoma (HNSCC) and was granted Fast Track designation by the Food and Drug Administration in June 2022.

About PDS Biotechnology
PDS Biotech is a clinical-stage immunotherapy company developing a growing pipeline of targeted cancer and infectious disease immunotherapies based on our proprietary Versamune^®, Versamune^® plus PDS0301, and Infectimune^® T cell-activating platforms. We believe our targeted immunotherapies have the potential to overcome the limitations of current immunotherapy approaches through the activation of the right type, quantity and potency of T cells. To date, our lead Versamune^® clinical candidate, PDS0101, has demonstrated the ability to reduce and shrink tumors and stabilize disease in combination with approved and investigational therapeutics in patients with a broad range of HPV16-associated cancers in multiple Phase 2 clinical trials and will be advancing into a Phase 3 clinical trial in combination with KEYTRUDA^® for the treatment of recurrent/metastatic HPV16-positive head and neck cancer in 2023. Our Infectimune^® based vaccines have also demonstrated the potential to induce not only robust and durable neutralizing antibody responses, but also powerful T cell responses, including long-lasting memory T cell responses in pre-clinical studies to date. To learn more, please visit www.pdsbiotech.com or follow us on Twitter at @PDSBiotech.

Forward Looking Statements
This communication contains forward-looking statements (including within the meaning of Section 21E of the United States Securities Exchange Act of 1934, as amended, and Section 27A of the United States Securities Act of 1933, as amended) concerning PDS Biotechnology Corporation (the “Company”) and other matters. These statements may discuss goals, intentions and expectations as to future plans, trends, events, results of operations or financial condition, or otherwise, based on current beliefs of the Company’s management, as well as assumptions made by, and information currently available to, management. Forward-looking statements generally include statements that are predictive in nature and depend upon or refer to future events or conditions, and include words such as “may,” “will,” “should,” “would,” “expect,” “anticipate,” “plan,” “likely,” “believe,” “estimate,” “project,” “intend,” “forecast,” “guidance”, “outlook” and other similar expressions among others. Forward-looking statements are based on current beliefs and assumptions that are subject to risks and uncertainties and are not guarantees of future performance. Actual results could differ materially from those contained in any forward-looking statement as a result of various factors, including, without limitation: the Company’s ability to protect its intellectual property rights; the Company’s anticipated capital requirements, including the Company’s anticipated cash runway and the Company’s current expectations regarding its plans for future equity financings; the Company’s dependence on additional financing to fund its operations and complete the development and commercialization of its product candidates, and the risks that raising such additional capital may restrict the Company’s operations or require the Company to relinquish rights to the Company’s technologies or product candidates; the Company’s limited operating history in the Company’s current line of business, which makes it difficult to evaluate the Company’s prospects, the Company’s business plan or the likelihood of the Company’s successful implementation of such business plan; the timing for the Company or its partners to initiate the planned clinical trials for PDS0101, PDS0203 and other Versamune^® and Infectimune^® based product candidates; the future success of such trials; the successful implementation of the Company’s research and development programs and collaborations, including any collaboration studies concerning PDS0101, PDS0203 and other Versamune^® and Infectimune^® based product candidates and the Company’s interpretation of the results and findings of such programs and collaborations and whether such results are sufficient to support the future success of the Company’s product candidates; the success, timing and cost of the Company’s ongoing clinical trials and anticipated clinical trials for the Company’s current product candidates, including statements regarding the timing of initiation, pace of enrollment and completion of the trials (including the Company’s ability to fully fund its disclosed clinical trials, which assumes no material changes to the Company’s currently projected expenses), futility analyses, presentations at conferences and data reported in an abstract, and receipt of interim or preliminary results (including, without limitation, any preclinical results or data), which are not necessarily indicative of the final results of the Company’s ongoing clinical trials; any Company statements about its understanding of product candidates mechanisms of action and interpretation of preclinical and early clinical results from its clinical development programs and any collaboration studies; and other factors, including legislative, regulatory, political and economic developments not within the Company’s control. The foregoing review of important factors that could cause actual events to differ from expectations should not be construed as exhaustive and should be read in conjunction with statements that are included herein and elsewhere, including the other risks, uncertainties, and other factors described under “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations'' and elsewhere in the documents we file with the U.S. Securities and Exchange Commission. The forward-looking statements are made only as of the date of this press release and, except as required by applicable law, the Company undertakes no obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise. 

Versamune^® and Infectimune^® are registered trademarks of PDS Biotechnology Corporation. KEYTRUDA^® is a registered trademark of Merck Sharp and Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, N.J., USA.

Investor Contact:
Rich Cockrell
CG Capital
Phone: +1 (404) 736-3838
Email: pdsb@cg.capital

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