The prognostic significance of percentage of tumour involvement according to disease risk group in men treated with radical prostatectomy

• Published in: Asian journal of andrology Vol. 13; no. 6; pp. 828 - 832
• Main Authors: Oh, Jong Jin, Lee, Sang Cheol, Jeong, Chang Wook, Yoon, Cheol Yong, Jeong, Seong Jin, Hong, Sung Kyu, Byun, Seok-Soo, Rho, Yoon Kwan, Choe, Gheeyoung, Lee, Sang Eun
• Format: Journal Article
• Language: English
• Published: China Medknow Publications & Media Pvt. Ltd 01.11.2011; Nature Publishing Group
• Subjects: Aged; Disease-Free Survival; Humans; Male; Middle Aged; Original; Prognosis; Prostate-Specific Antigen - blood; Prostatectomy - methods; Prostatic Neoplasms - pathology; Prostatic Neoplasms - surgery; Recurrence; 前列腺癌; 多变量模型; 多因素分析; 疾病; 肿瘤; 辅助治疗; 预后; 风险
• ISSN: 1008-682X; 1745-7262
• DOI: 10.1038/aja.2011.111

We investigated the prognostic significance of percentage of tumour involvement （PTI） according to the clinicopathological features of prostate cancer among patients who underwent radical prostatectomy （RP）. A retrospective study of 534 patients who underwent RP between September 2003 and March 2008 without any neoadjuvant or adjuvant therapy was performed. The associations of PTI with various clinicopathological features and biochemical recurrence-free survival were examined via uni- and multivariate analyses. The predictive accuracy of the multivariate model was assessed with a receiver operating characteristics-derived area under the curve. PTI was demonstrated to be significantly associated with preoperative prostate-specific antigen （PSA） level （P=0.001）, pathological Gleason score （P〈0.001）, extraprostatic tumour extension （P〈0.001）, seminal vesicle invasion （P〈0.001） and positive surgical margin （P〈0.001） in univariate analyses. When patients were stratified into disease risk groups, PTI was an independent predictor of biochemical recurrence-free survival in multivariate analysis only among the low-risk group （P=0.033） but not the intermediate- （P=0.287） or the high-risk groups （P=0.828）. The addition of the PTI did not significantly increase the accuracy of the multivariate model devised for the prediction of biochemical recurrence-free survival among both total patients （P=-0.459） and the low-risk group （P=0.268）, respectively. In conclusion, although PTI appeared to be a more significant prognostic factor among patients with low-risk disease than among those with higher risk diseases, overall, the PTI may not provide additional prognostic information beyond what can already be obtained via established prognostic factors.