Enzalutamide in chemotherapy-naive patients with metastatic castration-resistant prostate cancer: A retrospective Korean multicenter study in a real-world setting

Seung Il Jung, Myung Soo Kim, Chang Wook Jeong, Cheol Kwak, Sung Kyu Hong, Seok Ho Kang, Jae Young Joung, Seung Hwan Lee, Seok Joong Yun, Tae Hwan Kim, Sung Woo Park, Seong Soo Jeon, Minyong Kang, Ji Youl Lee, Byung Ha Chung, Jun Hyuk Hong, Hanjong Ahn, Choung Soo Kim, Dong Deuk Kwon

Research output: Contribution to journalArticle

Abstract

Purpose: This study aimed to evaluate the clinical efficacy of enzalutamide in chemotherapy-naïve metastatic castration-resistant prostate cancer (mCRPC) patients using real-world data from Korean patients. Materials and Methods: We retrospectively reviewed the medical records of 199 chemotherapy-naïve patients with mCRPC at 13 tertiary centers in Korea between 2014 and 2017. All patients received enzalutamide daily and 89 patients received concurrent androgen deprivation therapy (ADT). Results: The median age of the patients was 74 years. Initial results showed that 81.5% of the patients had Gleason score ≥8 and 33.3% of the patients had European Cooperative Oncology Group Performance Status 0. The overall mortality rate was 12%. The median OS was not archieved and 76.7% of patients were alive at 30 months. Median time until PSA progression was 6 months. The overall survival rate at 2 years was significantly higher (84.6% vs. 71.7%, p=0.015) and the duration of PSA progression-free survival was significantly longer (8.0 vs. 4.6 months, p=0.008) in patients receiving concurrent ADT than in those receiving enzalutamide alone. The incidence of adverse events of grade 3 or higher was 1.7%. Multivariate Cox proportional hazard analysis indicated that ADT administered concurrently with enzalutamide significantly improved the overall survival (hazard ratio, 0.346; 95% confidence interval, 0.125–0.958). Conclusions: Enzalutamide is effective and safe for chemotherapy-naïve patients with mCRPC. Furthermore, the overall survival was significantly higher in patients receiving enzalutamide and concurrent ADT than in patients receiving enzalutamide alone.

Original languageEnglish
Pages (from-to)19-27
Number of pages9
JournalInvestigative and clinical urology
Volume61
Issue number1
DOIs
Publication statusPublished - 2020 Jan

All Science Journal Classification (ASJC) codes

  • Urology

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    Jung, S. I., Kim, M. S., Jeong, C. W., Kwak, C., Hong, S. K., Kang, S. H., Joung, J. Y., Lee, S. H., Yun, S. J., Kim, T. H., Park, S. W., Jeon, S. S., Kang, M., Lee, J. Y., Chung, B. H., Hong, J. H., Ahn, H., Kim, C. S., & Kwon, D. D. (2020). Enzalutamide in chemotherapy-naive patients with metastatic castration-resistant prostate cancer: A retrospective Korean multicenter study in a real-world setting. Investigative and clinical urology, 61(1), 19-27. https://doi.org/10.4111/icu.2020.61.1.19