ASCO 2026: Translating the Top Prostate Cancer Data Into Clinical Action

In the newest episode of Oncology Decoded, hosts Manojkumar Bupathi, MD, MS; and Benjamin Garmezy, MD, provided a recap of the most critical presentations and data to emerge from the 2026 American Society of Clinical Oncology (ASCO) Annual Meeting. Specifically, they highlighted the late-breaking abstracts that may transform the standard of care for different prostate cancer populations.

Bupathi and Garmezy are executive cochairs of the Genitourinary Cancer Research Executive Committee at Sarah Cannon Research Institute (SCRI). Additionally, Bupathi is president and medical oncologist with Rocky Mountain Cancer Centers, specializing in solid tumors and genitourinary cancers. Garmezy is the associate director of genitourinary research for SCRI and a medical oncologist at SCRI Oncology Partners, specializing in genitourinary cancers.

Together, they dissected updated results from the following trials:

TALAPRO-3

In the phase 3 TALAPRO-3 trial (NCT04821622), combining talazoparib (Talzenna) with enzalutamide (Xtandi) significantly improved radiographic progression-free survival (rPFS) vs standard enzalutamide monotherapy among patients with metastatic castration-sensitive prostate cancer (CSPC) harboring homologous recombination repair (HRR) alterations.¹ Based on investigator assessment, the median rPFS was not reached (NR; 95% CI, NR-NR) with the talazoparib combination vs 45.8 months (95% CI, 37.7-NR) with enzalutamide plus placebo (HR, 0.481; 95% CI, 0.357-0.647; P <.0001).

Overall, the data supported talazoparib plus enzalutamide as a potential treatment option for patients with HRR-altered metastatic CSPC and highlighted the importance of early molecular testing in prostate cancer.

PROTEUS

Findings from the phase 3 PROTEUS trial (NCT03767244) demonstrated a reduced risk of death or metastasis with apalutamide (Erleada) plus androgen deprivation therapy (ADT) vs placebo plus ADT among patients with high-risk localized or locally advanced prostate cancer.² With a median follow-up of 61.7 months, 8.9% of patients in the apalutamide group experienced a pathological complete response (pCR) vs 1% of those who received placebo (OR, 10.17; 95% CI, 5.27-19.64; P <.001). The likelihood of metastasis-free survival at 5 years was 78.2% vs 73.5% in each respective arm (HR, 0.80; 95% CI, 0.67-0.96; P = .02).

According to the study investigators, results from PROTEUS may support apalutamide plus ADT and radical prostatectomy as a new standard of care for patient with high-risk localized or locally advanced disease.

References

1. Agarwal N, Matsubara N, Azad A, et al. TALAPRO-3: Talazoparib (TALA) + enzalutamide (ENZA) compared with placebo (PBO) + ENZA for the treatment of patients (pts) with metastatic castration-sensitive prostate cancer (mCSPC) harboring homologous recombination repair (HRR) gene alterations. J Clin Oncol. 2026;44(suppl 17):LBA5007. doi:10.1200/JCO.2026.44.17_suppl.LBA5007
2. Taplin ME, Gleave M, Shore N, et al. Perioperative (neoadjuvant and adjuvant) apalutamide (APA) + androgen deprivation therapy (ADT) vs placebo (PBO) + ADT with radical prostatectomy (RP) in high-risk localized or locally advanced prostate cancer (HR LPC/LAPC): final analysis of the PROTEUS phase 3 study. J Clin Oncol. 2026;44(suppl 17):LBA1. doi:10.1200/JCO.2026.44.17_suppl.LBA1