Early prostate-specific antigen response among Black and non-Black patients with advanced prostate cancer treated with apalutamide.

To assess reduction in prostate-specific antigen (PSA) levels among Black and non-Black patients treated with apalutamide for non-metastatic castration-resistant prostate cancer (nmCRPC) or metastatic castration-sensitive prostate cancer (mCSPC). Patients were identified from electronic medical data. PSA reduction (≥50%, ≥90% or below 0.2 ng/ml) after apalutamide initiation was assessed. A total of 313 patients with nmCRPC and 260 patients with mCSPC were identified. The majority of patients treated with apalutamide achieved a 90% reduction in PSA regardless of indication or race. The proportion of patients achieving a PSA reduction at any level was similar among Black and non-Black patients and was consistent with apalutamide phase III trials. In routine clinical practice, apalutamide consistently produced reduction in PSA levels in Black and non-Black men with nmCRPC or mCSPC.