Advaxis says ADXS-PSA in combination with KEYTRUDA prolonged survival in mCRPC Advaxis () announced updated data from the Phase 1/2 KEYNOTE-046 study in metastatic, castration-resistant prostate cancer. This trial is being conducted in conjunction with Merck (MRK) and is evaluating ADXS-PSA, one of Advaxis’ Listeria monocytogenes-based immunotherapies, alone and in combination with KEYTRUDA, Merck’s anti-PD-1 therapy. Findings will be highlighted in a poster discussion entitled “Effects of ADXS-PSA with or without Pembrolizumab on Survival and Antigen Spreading in Metastatic, Castration-Resistant Prostate Cancer Patients” at the American Association for Cancer Research Annual Meeting underway in Atlanta. KEYNOTE-046 is an open-label, multicenter, dose-determining safety and tolerability Phase 1/2 trial of 50 heavily pretreated patients conducted in two parts, with a Phase 2 expansion cohort. The objective of the study is to evaluate ADXS-PSA alone and in combination with KEYTRUDA for primary endpoints that include safety, tolerability and dosing. Secondary endpoints include anti-tumor activity and progression-free survival, and exploratory endpoints include associations between biomarkers of immunologic response with clinical outcomes. Key findings from the combination arm of KEYNOTE-046 include the following: The majority of treatment-related adverse events consisted of transient and reversible Grade 1-2 chills/rigors, fever, hypotension, nausea and fatigue. The combination of ADXS-PSA and pembrolizumab has been well-tolerated, to date, with no additive toxicity observed. Median overall survival was 21.1 months at data cutoff in this dataset of 37 patients. Correlative immune analyses showed T-cell responses against PSA in 75% of subjects and antigen spreading in 85% of subjects. Broader immune stimulation, including B-cell activation, was observed in the combination arm than in the ADXS-PSA monotherapy arm.
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