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Medivation Announces Presentation of Phase I Talazoparib Combination Data in Several Advanced Cancers

SAN FRANCISCO, CA, Apr 17, 2016 (Marketwired via COMTEX) -- Medivation, Inc. MDVN, +3.96% today announced that Phase I data from its investigational agent talazoparib, a highly-potent PARP inhibitor, was presented at the American Association for Cancer Research (AACR) Annual Meeting 2016 in New Orleans by the study's lead investigator Zev A. Wainberg, M.D., Associate Professor of Medicine at the University of California Los Angeles (UCLA) and Co-Director of the UCLA GI Oncology Program, during a Clinical Trials Mini-Symposium. The primary objective of the study was to determine the maximum tolerated dose (MTD) of talazoparib in combination with either low-dose temozolomide or low-dose irinotecan in heavily pretreated patients with advanced malignancies.

The data from the 40 patient trial demonstrated that combination treatment with talazoparib and low-dose chemotherapy resulted in stable disease or an objective response in 23 of 40 heavily pretreated patients with a variety of advanced cancers (clinical benefit rate of 58%). Most notably, objective responses were seen in four of seven (57%) heavily pre-treated non-BRCA-mutated ovarian cancer patients when talazoparib was used in combination with either low-dose temozolomide or low-dose irinotecan. Six of seven individuals (86%) with non-BRCA ovarian cancer had clinical benefit (four partial responses and two stable disease) and had a reduction in CA 125 levels by 50% or greater.

Importantly, the overall study demonstrated responses to combination talazoparib/low-dose chemotherapy in patients with multiple tumor types in which specific deleterious mutations in certain DNA repair genes extended beyond BRCA deficiency, including one patient who did not meet the criteria of having homologous recombination deficiency (HRD). These effects may be mediated through PARP inhibition, as well as enhanced PARP trapping, which interferes with the tumor cell's ability to replicate DNA by locking PARP molecules onto the DNA strand.

"In non-clinical studies, talazoparib has been shown to have high potency specifically against PARP 1 and 2, and antitumor effects in various solid tumors. With these new results, we now have evidence in humans that suggests talazoparib in combination with low-dose chemotherapy is active in tumors with defects in DNA repair beyond BRCA deficiency, and possibly in patients without evidence of HRD. We feel these data...