Real-world outcomes in patients with metastatic castration-resistant prostate cancer beyond progression after upfront androgen receptor signaling inhibitor

• Published in: International journal of clinical oncology Vol. 29; no. 12; pp. 1946 - 1958
• Main Authors: Yamamoto, Yutaka, Fujimoto, Saizo, Hashimoto, Mamoru, Minami, Takafumi, Fukuokaya, Wataru, Yanagisawa, Takafumi, Saruta, Masanobu, Takahara, Kiyoshi, Nishimura, Kazuki, Tsujino, Takuya, Nakamori, Yuta, Hashimoto, Takeshi, Kimura, Takahiro, Shiroki, Ryoichi, Azuma, Haruhito, Ohno, Yoshio, Fujita, Kazutoshi
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.12.2024; Springer Nature B.V
• Subjects: Aged; Aged, 80 and over; Androgen Receptor Antagonists - therapeutic use; Androgen receptors; Androgens; Cancer Research; Castration; Disease Progression; Docetaxel - therapeutic use; Humans; Male; Medicine; Medicine & Public Health; Metastases; Metastasis; Middle Aged; Oncology; Original Article; Patients; Progression-Free Survival; Prostate cancer; Prostate-specific antigen; Prostatic Neoplasms, Castration-Resistant - drug therapy; Prostatic Neoplasms, Castration-Resistant - mortality; Prostatic Neoplasms, Castration-Resistant - pathology; Receptors, Androgen; Retrospective Studies; Surgical Oncology; Survival; Treatment Outcome; Metastatic castration-sensitive prostate cancer; Upfront; Androgen receptor signaling inhibitor; Docetaxel
• ISSN: 1341-9625; 1437-7772; 1437-7772
• DOI: 10.1007/s10147-024-02637-6

Background Upfront androgen receptor signaling inhibitor (ARSI) along with androgen deprivation therapy is the current standard of care for metastatic castration-sensitive prostate cancer. However, evidence on second-line therapy after upfront ARSI is scarce. We aimed to evaluate the oncological outcome of ARSI versus docetaxel (DOC) after upfront ARSI therapy in a real-world clinical practice. Methods Subjects were metastatic castration-resistant prostate cancer (mCRPC) patients who had progressed within 2 years of upfront ARSI therapy and received ARSI (ARSI group) or DOC (DOC group) as a second-line therapy. Second-line progression-free survival (second-line PFS), and second-line overall survival (second-line OS) were assessed. Propensity score matching (PSM) was used to adjust the clinicopathological features and treatment patterns. Results A total of 101 mCRPC patients, 68 in the ARSI group, and 33 in the DOC group, were included in this analysis. Median second-line PFS was 6.3 months in the ARSI group and 4.9 months in the DOC group ( p  = 0.21). Median second-line OS was 25.0 months in the ARSI group and 14.2 months in the DOC group ( p  = 0.06). Prostate-specific antigen nadir ≤ 0.2 ng/ml during upfront ARSI therapy was significantly associated with improved second-line PFS. After PSM, no significant difference in second-line PFS and second-line OS were observed between the two groups. Conclusion ARSI or DOC has comparable oncologic outcomes in terms of second-line PFS and second-line OS. Further prospective research with longer follow-ups will be needed to identify the optimal treatment after upfront ARSI therapy.