PDS Biotech Announces Interim Safety and Immune Response Data from Phase 1/2 Clinical Trial Evaluating Novel Antibody Drug Conjugate PDS0301 Combined with Docetaxel to Treat Metastatic Prostate Cancer

• First study of patients with metastatic prostate cancer to evaluate standard-of-care chemotherapy (docetaxel) combined with an antibody drug conjugate (PDS0301).
• Decrease in prostate specific antigen (PSA) levels was seen in all patients at all three tested doses of PDS0301.
• The combination was well-tolerated at all tested dose levels.
• Data to be presented by National Cancer Institute as an oral presentation at Cytokines 2023.

PRINCETON, N.J., Oct. 11, 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 interim safety and immune response data for the first-in-human Phase 1/2 clinical trial evaluating PDS0301, a novel investigational tumor-targeting, antibody-conjugated Interleukin 12, in combination with current standard-of-care (SOC) chemotherapy, docetaxel, to treat metastatic castration sensitive (mCSPC) and castration resistant (mCRPC) prostate cancer. The data will be featured in an oral presentation by Ravi A. Madan, MD, Head, Prostate Cancer Clinical Research Section, Genitourinary Malignancies Branch, Center for Cancer Research of the National Cancer Institute, an Institute of the National Institutes of Health, at the 11^th Annual Meeting of the International Cytokine & Interferon Society (Cytokines 2023) in Athens, Greece.

“We are encouraged by the preliminary data from the Phase 1/2 clinical trial evaluating PDS0301 in combination with docetaxel for patients with metastatic prostate cancer which has the potential to improve treatment outcomes for patients with advanced and refractory prostate cancers that have spread to other parts of the body,” said Lauren V. Wood, MD, Chief Medical Officer of PDS Biotech.

Eighteen patients (11 with mCSPC and 7 with mCRPC) with a median age of 69 years (range 39-82) were evaluated for clinical activity and toxicity. Three dose levels of PDS0301 (8.0 mcg/kg, 12.0 mcg/kg, and 16.8 mcg/kg) in combination with docetaxel (75 mg/m²) were administered every three weeks beginning with the second cycle of treatment. The dose-limiting toxicity (DLT) window spanned the 6 weeks after initiating docetaxel. While all doses of PDS0301 were well-tolerated, the 12.0 mcg/kg dose of PDS0301 with chemotherapy provided the best combination of immune response and tolerability.