Pfizer Inc. announced positive results from the phase III TALAPRO-2 study of Talzenna (talazoparib), an oral poly ADP-ribose polymerase inhibitor, in combination with Xtandi (enzalutamide), an androgen receptor pathway inhibitor, demonstrating a statistically significant and clinically meaningful improvement in overall survival compared to placebo plus Xtandi in patients with metastatic castration-resistant prostate cancer, with or without homologous recombination repair gene mutations.