Improved outcomes in elderly patients with metastatic castration-resistant prostate cancer treated with the androgen receptor inhibitor enzalutamide: results from the phase III AFFIRM trial.
BACKGROUND
The randomized, double-blind phase III AFFIRM trial demonstrated that enzalutamide, an oral androgen receptor inhibitor, significantly prolonged overall survival (OS) [median 18.4 versus 13.6 months (hazard ratio, HR) 0.63 (95% confidence interval, CI, 0.53-0.75); P<0.001] compared with placebo in patients with metastatic castration-resistant prostate cancer who received prior docetaxel chemotherapy.


PATIENTS AND METHODS
A post hoc analysis was carried out to assess the efficacy and safety of enzalutamide on outcomes in younger (<75 years) and elderly (≥75 years) patients in the AFFIRM population. Statistics are presented by age group (<75 years, ≥75 years) for efficacy outcomes of OS, radiographic progression-free survival (rPFS), time to prostate-specific antigen (PSA) progression, PSA response, and safety.


RESULTS
OS was significantly improved with enzalutamide over placebo in patients<75 years [median not yet reached versus 13.6 months; HR 0.63 (95% CI 0.52-0.78), P<0.001] and in patients ≥75 years [median 18.2 versus 13.3 months; HR 0.61 (95% CI 0.43-0.86), P=0.004], respectively. rPFS was similarly improved in both the younger [HR 0.45 (95% CI 0.38-0.53), P<0.001] and elderly patient cohorts [HR 0.27 (95% CI 0.20-0.37), P<0.001] relative to placebo, as were time to PSA progression and PSA response. Adverse events (AEs) were similar between the two enzalutamide age groups, with the exception of an increase in patients≥75 years in the rates of all grade peripheral edema (22.1% versus 12.5%), fatigue (39.7% versus 31.6%), and diarrhea (26.6% versus 19.6%). The overall grade≥3 AE rates were low with no major difference in frequency or severity between age groups or treatment arms. Five patients were reported with seizure events; three patients<75 years and two patients ≥75 years.


CONCLUSIONS
Enzalutamide significantly improves outcomes in both younger (<75 years) and elderly patients (≥75 years), with comparable safety and tolerability.
['Sternberg|C N|CN|', 'de Bono|J S|JS|', 'Chi|K N|KN|', 'Fizazi|K|K|', 'Mulders|P|P|', 'Cerbone|L|L|', 'Hirmand|M|M|', 'Forer|D|D|', 'Scher|H I|HI|']
D000368:Aged D059002:Androgen Receptor Antagonists D000970:Antineoplastic Agents D001549:Benzamides D001859:Bone Neoplasms D018572:Disease-Free Survival D004311:Double-Blind Method D006801:Humans D053208:Kaplan-Meier Estimate D008297:Male D009570:Nitriles D010669:Phenylthiohydantoin D016016:Proportional Hazards Models D064129:Prostatic Neoplasms, Castration-Resistant D016896:Treatment Outcome
elderly patients metastatic castration-resistant prostate cancer enzalutamide AFFIRM trial