Purpose To evaluate the subclassifications of pT2 diseases in tumor-nodes-metastases ( TNM) staging system for prostate cancer. Methods A retrospective analysis of the medical records of patients who underwent radical prostatectomy ( RP) with the diag-nosis of clinically localized PCa was conducted. Any preoperative therapies, in terms of active surveillance, hormone therapy or radia-tion were exclusion criteria. The RP specimens were completely embedded and histopathologically evaluated for extraprostatic exten-sion, seminal vesicle invasion and staged according to the 2002/2010 TNM staging criteria. Results Using current 2002/2010 TNM staging criteria, in all, 15 cases of the tumors were pT2, 10 cases were pT3a, and 5 cases were pT3a. When subclassification of pT2, 2 cases of the tumors were pT2a, 13 cases of the tumors were pT2c, and none was identified as a pathological T2b tumor. Conclusion The results of the present study suggest that the pathological substaging criteria of organ-confined prostate cancer via methods used in the current 2002/2010 TNM staging system may not be appropriate. Efforts should be made to upgrade the current TNM staging system for prostate cancer.