Deep Prostate-specific Antigen Response following Addition of Apalutamide to Ongoing Androgen Deprivation Therapy and Long-term Clinical Benefit in SPARTAN.

Apalutamide plus androgen deprivation therapy (ADT) significantly improved metastasis-free survival (MFS), overall survival (OS), and time to prostate-specific antigen (PSA) progression in the placebo-controlled SPARTAN study of high-risk nonmetastatic castration-resistant prostate cancer (nmCRPC). To assess the relationships between PSA kinetics, outcomes, and molecular subtypes in SPARTAN. The authors conducted a post hoc analysis of nmCRPC patients randomized to receive apalutamide (n = 806) or placebo (n = 401) plus ADT and a subset stratified by molecular classifiers. Apalutamide 240 mg/d. The association between PSA kinetics and MFS, OS, time to PSA progression, and molecular subtypes was evaluated using the landmark analysis and Kaplan-Meier methods. By 3 mo, PSA decreased in most apalutamide-treated patients and increased in most placebo-treated patients. After apalutamide, the median time to PSA nadir, confirmed ≥50% PSA reduction, ≥90% PSA reduction, and PSA ≤0.2 ng/ml were 7.4, 1.0, 1.9, and 2.8 mo, respectively. By 6 mo, 90%, 57%, and 32% of apalutamide patients had ≥50% PSA reduction, ≥90% PSA reduction, and PSA ≤0.2 ng/ml, respectively, while only 1.5% of placebo patients experienced ≥50% PSA reduction. PSA reductions were observed within 3 mo and up to 12 mo of apalutamide treatment, and were similar across molecular subtypes. Deep PSA responses (≥90% PSA reduction or PSA ≤0.2 ng/ml) at landmark 6-mo apalutamide treatment were significantly associated with improved time to PSA progression (hazard ratio {HR} [95% confidence interval {CI}] 0.25 [0.18-0.33] or 0.13 [0.08-0.21]), MFS (0.41 [0.29-0.57] or 0.3 [0.19-0.47]), and OS (0.45 [0.35-0.59] or 0.26 [0.18-0.38]; p < 0.001 for all). Apalutamide plus ADT produced rapid, deep, and durable PSA responses by 6-mo treatment regardless of assessed molecular prognostic markers. An early PSA response with apalutamide was associated with clinical benefits, supporting prognostic value of PSA monitoring. In this report, we describe how prostate-specific antigen (PSA) levels relate to outcomes in patients with nonmetastatic castration-resistant prostate cancer treated with apalutamide plus androgen deprivation therapy (ADT). We found that treatment with apalutamide plus ADT resulted in rapid, deep, and durable PSA responses in the majority of patients, including those with high-risk molecular subtypes, which were associated with improved survival.

Saad F ，Small EJ ，Feng FY ，Graff JN ，Olmos D ，Hadaschik BA ，Oudard S ，Londhe A ，Bhaumik A ，Lopez-Gitlitz A ，Thomas S ，Mundle SD ，Chowdhury S ，Smith MR ... -  《-》

Post Hoc Analysis of Rapid and Deep Prostate-specific Antigen Decline and Patient-reported Health-related Quality of Life in SPARTAN and TITAN Patients with Advanced Prostate Cancer.

Small EJ ，Chi KN ，Chowdhury S ，Bevans KB ，Bhaumik A ，Saad F ，Chung BH ，Karsh LI ，Oudard S ，De Porre P ，Brookman-May SD ，McCarthy SA ，Mundle SD ，Uemura H ，Smith MR ，Agarwal N ... -  《European Urology Oncology》

Deep, rapid, and durable prostate-specific antigen decline with apalutamide plus androgen deprivation therapy is associated with longer survival and improved clinical outcomes in TITAN patients with metastatic castration-sensitive prostate cancer.

The first interim analysis of the phase III, randomized, double-blind, placebo-controlled, multinational TITAN study demonstrated improved overall survival (OS) and radiographic progression-free survival (rPFS) with apalutamide added to ongoing androgen deprivation therapy (ADT) in patients with metastatic castration-sensitive prostate cancer. The final analysis confirmed improvement in OS and other long-term outcomes. We evaluated prostate-specific antigen (PSA) kinetics and the association between PSA decline and outcomes in patients with metastatic castration-sensitive prostate cancer from TITAN. Patients received apalutamide (240 mg/day) or placebo plus ADT (1 : 1). This post hoc exploratory analysis evaluated PSA kinetics and decline in relation to rPFS (22.7 months' follow-up) and OS, time to PSA progression, and time to castration resistance (44.0 months' follow-up) in patients with or without confirmed PSA decline using a landmark analysis, the Kaplan-Meier method, and Cox proportional hazards model. One thousand and fifty-two patients (apalutamide, 525; placebo, 527) were enrolled. Best confirmed PSA declines (≥50% or ≥90% from baseline or to ≤0.2 ng/ml) were achieved at any time during the study in 90%, 73%, and 68% of apalutamide-treated versus 55%, 29%, and 32% of placebo-treated patients, respectively. By 3 months of apalutamide treatment, best deep PSA decline of ≥90% or to ≤0.2 ng/ml occurred in 59% and 51% of apalutamide- and in 13% and 18% of placebo-treated patients, respectively. Achievement of deep PSA decline at landmark 3 months of apalutamide treatment was associated with longer OS [hazard ratio (HR) 0.35; 95% confidence interval (CI) 0.25-0.48), rPFS (HR 0.44; 95% CI 0.30-0.65), time to PSA progression (HR 0.31; 95% CI 0.22-0.44), and time to castration resistance (HR 0.38; 95% CI 0.27-0.52) compared with no decline (P < 0.0001 for all). Similar results were observed at landmark 6 and 12 months of apalutamide treatment. Apalutamide plus ADT demonstrated a robust (rapid, deep, and durable) PSA decline that was associated with improved clinical outcomes, including long-term survival.

Chowdhury S ，Bjartell A ，Agarwal N ，Chung BH ，Given RW ，Pereira de Santana Gomes AJ ，Merseburger AS ，Özgüroğlu M ，Juárez Soto Á ，Uemura H ，Ye D ，Brookman-May SD ，Londhe A ，Bhaumik A ，Mundle SD ，Larsen JS ，McCarthy SA ，Chi KN ... -  《-》

Health-related Quality of Life at the SPARTAN Final Analysis of Apalutamide for Nonmetastatic Castration-resistant Prostate Cancer Patients Receiving Androgen Deprivation Therapy.

In SPARTAN, apalutamide improved metastasis-free and overall survival for patients with nonmetastatic castration-resistant prostate cancer (nmCRPC) with a prostate-specific antigen doubling time of ≤10 mo. We evaluated health-related quality of life (HRQoL) at the final analysis of the SPARTAN study. Patients received apalutamide (240 mg/d) or placebo in 28-d cycles. All patients continued androgen deprivation therapy (ADT). A total of 1207 patients with nmCRPC were randomized 2:1 to apalutamide or placebo. HRQoL was assessed using Functional Assessment of Cancer Therapy-Prostate (FACT-P) and EQ-5D-3L questionnaires at day 1 of cycle 1 (predose/baseline), cycles 2-6, every two cycles during cycles 7-13, every four cycles thereafter, at the end of treatment, and every 4 mo after progression to 1  yr. Results are presented using descriptive statistics. A mixed model for repeated measures was fitted to estimate the mean scores at each scheduled visit during treatment. At final analysis, with 52 mo follow-up for survival, the median treatment duration was 32.9 mo for apalutamide and 11.5 mo for placebo. Patients had good baseline HRQoL. At each scheduled collection during treatment, >90% per group completed the questionnaires. The change in FACT-P total score from baseline to cycles 21 and 25 significantly favored apalutamide over placebo (p = 0.0138 and 0.0009, respectively). The apalutamide group generally maintained favorable FACT-P (total and subscales) and EQ-5D-3L scores, while placebo scores tended to decline over time (starting in cycles 11-13 and pronounced by cycles 21-25). Notably, patient-reported fatigue did not worsen with apalutamide. Most patients reported being "not at all bothered" by side effects, and bother did not increase over time with apalutamide or placebo. Patients receiving apalutamide had minimal change in side-effect bother following symptomatic adverse events. Final analysis of SPARTAN confirms that HRQoL is preserved in patients with nmCRPC receiving apalutamide plus ADT, but declines in patients receiving placebo plus ADT after approximately 1 yr. Responses from patients with prostate cancer who were included in the SPARTAN study indicated that treatment with apalutamide, even after the most extensive follow-up time possible, did not reduce their quality of life. These results, along with improved survival and longer time to the development of metastases (reported separately), confirm the benefits of apalutamide for patients with nonmetastatic castration-resistant prostate cancer.

Oudard S ，Hadaschik B ，Saad F ，Cella D ，Basch E ，Graff JN ，Uemura H ，Dibaj S ，Li S ，Brookman-May SD ，De Porre P ，Bevans KB ，Trudeau JJ ，Small EJ ，Smith MR ... -  《European Urology Focus》

Association of Molecular Subtypes With Differential Outcome to Apalutamide Treatment in Nonmetastatic Castration-Resistant Prostate Cancer.

Feng FY ，Thomas S ，Saad F ，Gormley M ，Yu MK ，Ricci DS ，Rooney B ，Brookman-May S ，McCarthy S ，Olmos D ，Chowdhury S ，Hadaschik B ，Liu Y ，Davicioni E ，Smith MR ，Small EJ ... -  《-》