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Advaxis’s Phase 2 Head and Neck Cancer Study of AXAL Advances to Second Stage

 

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Advaxis, Inc. announced that its Phase 2 “window of opportunity” clinical study of its lead immunotherapy candidate, axalimogene filolisbac (AXAL), in patients with late-stage HPV-associated oropharyngeal cancer (HPVOPC) met its stage 1 primary objective and is advancing into the second stage of the clinical study.

This is an investigator-initiated prospective clinical study of patients with stage I-IV HPVOPC who are to undergo ablative trans-oral robotic surgery (TORS) as a preoperative treatment. The clinical study leverages the five- to six-week period between diagnosis and TORS, making it possible to analyze and compare the tumor microenvironment as well as peripheral blood samples collected before and after AXAL treatments.

The clinical study is designed to show that AXAL is highly immunogenic and worth further investigation if the overall rate of vaccine-induced T-cell responses is 75 percent or more. By looking at both IFN-γ and TNFα expressing T cells in the peripheral blood, it was found that systemic HPV-reactive T-cell responses were increased in enough patients treated with AXAL to meet the stage 1 immune response target. This evidence of systemic response is consistent with a recent abstract presented at the American Association for Cancer Research (AACR) describing increased cytotoxic T-cell infiltration into the tumor microenvironment in HPVOPC patients treated with AXAL.

“The assessment of the TNFα and IFN-γ response based on data from eight of the anticipated nine patients to be enrolled in stage 1 confirmed that the clinical study has already met the target for the overall rate of vaccine-induced T-cell response, paving the way for us to progress to stage 2,” said the study’s lead investigator Andrew G. Sikora, MD, PhD, of the Bobby R. Alford Department of Otolaryngology-Head and Neck Surgery at Baylor College of Medicine. “Together with our prior published data showing increased intratumoral T-cell infiltration in a significant number of AXAL treated patients, these data provide the confidence needed to move forward with the definitive evaluation of its immunogenicity.”

Stage 2 of the clinical study will enroll up to 13 patients with late-stage HPVOPC. This stage of the clinical study will be conducted at the Icahn School of Medicine at Mount Sinai and a second investigative site anticipated to be the Baylor College of Medicine. The study received a three-year $1.1 million grant from the U.S. Food and Drug Administration’s Office of Orphan Products Development, which funds research for the development of products for rare diseases.

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