PDS Biotechnology (PDSB) Announces Preliminary Efficacy Achievement in Phase 2 Combination Trial of PDS0101 Led by the National Cancer Institute

February 3, 2021 9:04 AM EST

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PDS Biotechnology Corporation (Nasdaq: PDSB), a clinical-stage immunotherapy company developing novel cancer therapies and infectious disease vaccines based on the Company’s proprietary Versamune® T-cell activating technology, today announced that the National Cancer Institute’s (NCI) Phase 2 clinical study of PDS0101 for the treatment of advanced human papillomavirus (HPV)-associated cancers that have progressed or returned after treatment achieved its preliminary objective response. The trial, which studies PDS0101 in combination with two investigational immune-modulating agents bintrafusp alfa (M7824), a TGF-β “trap”/ anti-PD-L1 bifunctional fusion protein, and NHS-IL12 (M9241), a DNA-targeted immunocytokine, will now progress to full enrollment of approximately 20 in this group of checkpoint inhibitor (CPI) naïve patients. As a result of achieving this milestone, preliminary efficacy assessment of the triple combination in an added group of approximately 20 patients who have failed prior therapy with checkpoint inhibitors (CPI refractory) is ongoing.

The NCI Center for Cancer Research’s Laboratory of Tumor Immunology and Biology (LTIB) and Genitourinary Malignancies Branch (GMB) are jointly leading this Phase 2 trial. The trial is evaluating the treatment combination in two patient groups: one in patients who failed prior treatment, but are naïve to checkpoint inhibitor treatment; and the second in patients who have failed treatment with checkpoint inhibitors. As prespecified in the clinical trial design, the achievement of an objective response as measured by radiographic tumor responses according to RECIST 1.1 or iRECIST among at least three of the first eight patients allows the trial to progress to full enrollment.

Pooled data from phase 1 and 2 trials reported in the October 2020 issue of the Journal for Immunotherapy of Cancer (J ImmunoTher Cancer 2020;8:e001395. doi:10.1136/jitc-2020-001395) showed that bintrafusp alfa (M7824) a first-in-class bifunctional fusion protein composed of the extracellular domain of human TGF-β (TGF-β “trap”) fused to an IgG1 antibody blocking PD-L1 (anti–PD-L1) protein, demonstrated efficacy in checkpoint inhibitor-naïve patients with HPV-associated malignancies. The observed response rate was 30.5%. M9241 is an immunocytokine composed of 2 heterodimers of IL-12 fused to the heavy chains of a human antibody targeting DNA released from necrotic tumor cells. In preclinical studies performed at the NCI comparing each drug alone versus all three agents used in combination, the triple combination achieved the highest induction of tumor-specific CD8+ killer T-cells and superior antitumor effect (J ImmunoTher Cancer 2020;8:e000612. doi:10.1136/jitc-2020-000612).

“The achievement of this important milestone in this NCI-led Phase 2 clinical trial strengthens the evidence of our novel Versamune® platform’s potential ability to induce high levels of tumor-specific CD8+ killer T-cells that attack the cancer to achieve tumor regression,” commented Dr. Lauren Wood, Chief Medical Officer of PDS Biotech. “The initial data solidifies our belief that PDS0101’s demonstrated preclinical efficacy when combined with these two immune-modulating agents, has the potential to significantly improve clinical outcomes for patients with advanced and currently untreatable HPV-associated cancers.”

The studies are being performed as part of a Cooperative Research and Development Agreement (CRADA) between PDS Biotech and the NCI. Dr. Jeffrey Schlom, Chief, LTIB, and Dr. James Gulley, Chief, GMB, at NCI are serving as principal investigators for the NCI, while Dr. Frank Bedu-Addo and Dr. Lauren Wood, PDS Biotech’s Chief Executive Officer and Chief Medical Officer respectively, are serving as PDS Biotech’s investigators.

Dr. Julius Strauss, Staff Clinician, LTIB, is serving as the Principal Investigator of this phase 2 clinical trial in advanced HPV-associated cancers. For patients interested in enrolling in this clinical study, please call NCI’s toll-free number 1-800-4-CANCER (1-800-422-6237), email NCIMO_Referrals@mail.nih.gov, or visit the website: https://trials.cancer.gov.

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