On November 10, 2025 PDS Biotechnology Corporation (Nasdaq: PDSB) ("PDS Biotech" or the "Company"), a late-stage immunotherapy company focused on transforming how the immune system targets and kills cancers, reported positive clinical and translational data presented at the 2025 Society for Immunotherapy of Cancer (SITC) (Free SITC Whitepaper) Annual Meeting. The presentations highlight immune-driven mechanisms and biomarkers that explain strong clinical activity of the Company’s investigational HPV16-targeted immunotherapy PDS0101 and its novel, investigational immunocytokine PDS01ADC.

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The studies were performed as part of PDS Biotech’s collaborative research and development agreement (CRADA) with the National Cancer Institute (NCI) Center for Cancer Research (CCR). Presentations at SITC (Free SITC Whitepaper) 2025 included one rapid oral abstract, recognized among the top 150 abstracts of the meeting, and two poster presentations.

"The data presented at SITC (Free SITC Whitepaper) further validate the scientific underpinnings of our immunotherapy platforms and confirm that our development approach is achieving the intended immunological and clinical effects," said Frank Bedu-Addo, Ph.D., President and Chief Executive Officer of PDS Biotech. "These findings provide a deeper understanding of how our immunotherapies are generating such promising results in advanced cancers. The ability to measure and model these immune effects enhances confidence in our programs and supports our regulatory strategy to advance these novel, investigational immunotherapies toward commercialization as efficiently as possible for patients with difficult-to-treat cancers."

PDS0101) Data Highlights

Rapid Oral Abstract Presentation Number: 37
Title: Baseline and early changes in serum proteomic profiles predict anti-tumor activity in patients with advanced HPV-associated malignancies treated with novel combination immunotherapy
Authors: Megan Lynch, Meghali Goswami, Charalampos Floudas, Julius Strauss, Yo-Ting Tsai, Jennifer Marte, James Gulley, Jeffrey Schlom, Renee Donahue
Recognition: Selected among the Top 150 abstracts at SITC (Free SITC Whitepaper) 2025

Key findings:

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Analysis of 50 patients with advanced HPV16-positive cancers treated with the combination of PDS0101, PDS01ADC and an immune checkpoint inhibitor showed strong and broad immune activation, with increases in multiple critical pro-inflammatory cytokines that are essential in recruiting T cells and enhancing their potency.

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Quantitative measurements of various immunological proteins in the blood were found to predict clinical benefit with good accuracy.

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The data supports continued evaluation of these biomarkers obtained by blood sampling, and prospective validation of the developed predictive models in future clinical trials.

These translational findings further reinforce the strong clinical activity seen with PDS0101 combinations across three phase 2 trials. By establishing a clear link between specific immune signatures and clinical response, the data provide strong rationale for future biomarker-guided optimization of PDS0101-based immunotherapy combinations.

PDS01ADC (IL-12 tumor-targeting immunocytokine) Data Highlights

Abstract Number: 47
Title: A tumor-targeting IL-12 immunocytokine therapy in patients with advanced solid tumors increases peripheral natural killer (NK) cells with phenotypes associated with increased tumor cell lysis
Authors: Stephanie Pitts, Nicole Toney, Jennifer Marte, James Gulley, Jeffrey Schlom, Renee Donahue

Key findings:

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PDS01ADC monotherapy promoted generation of multi-functional NK cells that were associated with induction of a clinical response in advanced treatment-resistant patients with solid tumors.

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Specific types of NK cells associated with effective killing were seen to increase in advanced cancer patients with solid tumors upon treatment with PDS01ADC, and the increases were associated with an improved clinical response.

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Several types of NK cells associated with poor anti-tumor response were seen to decrease with PDS01ADC therapy, and these decreases were associated with an improved clinical response.

Collectively, these results demonstrate immune reprogramming of NK cells toward killer phenotypes upon treatment with PDS01ADC and provide mechanistic support for PDS01ADC-based combination immunotherapy strategies.

Abstract Number: 168
Title: Increases in peripheral memory T cells with self-renewing properties in patients with advanced solid tumors treated with tumor-targeting IL-12 immunocytokine therapy
Authors: Meghali Goswami, Carolina Celades, Christine Minnar, Asma Khelifa, Lisa Poppe, Dara Bracken-Clarke, Nicole Toney, Megan Lynch, Jennifer Marte, Sofia Gameiro, James Gulley, Jeffrey Schlom, Renee Donahue

Key findings:

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PDS01ADC monotherapy increased the quantity of stem-like memory, CD8 (killer) and CD4 (helper) T cells that had self-replicating properties in patients with advanced solid tumors

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In 28 patients with advanced solid tumors, increases in stem-like T cells was associated with stabilization of disease
These translational findings show that PDS01ADC promotes specific types of self-replicating T cells that enhance the durability of anti-tumor immunity.

"The immune signatures we observed with both PDS0101 and PDS01ADC deepen our understanding of how these therapies generate a powerful anti-tumor immune response. We are seeing broad immune activation, including early natural killer cell responses and expansion of durable, stem-like memory T cells, features that are critical for long-term tumor control," said Kirk Shepard, M.D., Chief Medical Officer of PDS Biotech. "The translational data presented at SITC (Free SITC Whitepaper), including early immune biomarker signatures, HPV ctDNA dynamics, and coordinated NK and T cell activation validate our platforms scientifically. These insights will also help us design future studies and combination approaches that fully leverage each therapy’s unique mechanism of action."

Building on these findings, PDS Biotech continues to advance the development of PDS0101 and PDS01ADC. The company is developing PDS0101 in combination with Keytruda (pembrolizumab) in a phase 3 clinical trial of HPV16-positive recurrent/metastatic head and neck cancer. In parallel, PDS Biotech is advancing PDS01ADC via NCI-led Phase 2 clinical trials under PDS Biotech’s CRADA with the NCI in metastatic colorectal cancer, cholangiocarcinoma, biochemically recurrent prostate cancer, and castration resistant and castration sensitive prostate cancer. Collectively, these data presented at SITC (Free SITC Whitepaper) 2025 strengthen the scientific foundation of the Company’s immunotherapy platforms and support continued progress toward future regulatory and clinical milestones.

(Press release, PDS Biotechnology, NOV 10, 2025, View Source [SID1234659723])