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.”