Backgrounds At present, the application of tumor reduction surgery in oligometastatic prostate cancer has aroused extensive discussion among urologists, but clinicians have not reached a consensus on this issue. The purpose of this study was to evaluate the effect of cytoreductive surgery for patients with oligometastatic prostate cancer by meta-analysis. Methods All relevant studies were systematically searched through The Cochrane Library, PubMed, Web of Science, EMBASE, and China Biomedical Literature Database (CBM) up to December 2019. All the previous clinical studies on the comparison of long-term efficacy between the cytoreductive surgery group and the endocrine therapy group were included in the search. The included studies were analyzed using Stata ver.14.0. The research has been registered on PROSPERO website with the registration number of crd42021224316. The relevant registration information can be obtained from the website: https://www.crd.york.ac.uk/prospero. Results The case presentation is as follows: ten studies were identified that met the conclusion criteria. The total number of samples was 804; 449 patients underwent cytoreductive surgery, and 355 patients underwent endocrine therapy, and we conducted a meta-analysis of studies to compare the prognosis of endocrine therapy and cytoreductive surgery for treating prostate cancer. After all the studies were analyzed, we found that between cytoreductive surgery and endocrine therapy, a significant difference existed in overall survival (HR = 0.635, 95% CI 0.443–0.908, P = 0.013), cancer-specific survival (HR = 0.407, 95% CI 0.243–0.681, P = 0.001), and progression-free survival (HR = 0.489, 95% CI 0.315–0.758, P = 0.001), while there were no significant difference in progresses to castration-resistant prostate cancer (HR = 0.859, 95% CI 0.475–1.554, P = 0.616). Conclusion The cytoreductive surgery held advantages in overall survival, cancer-specific survival, and progression-free survival. Therefore, compared with endocrine therapy, cytoreductive surgery could be a more suitable approach in treating oligometastatic prostate cancer.
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