The Impact of Restaging Transurethral Resection of Bladder Tumor on Survival Parameters in T1 Nonmuscle-Invasive Bladder Cancer: Systematic Review and Meta-Analysis.

T1, high-grade, nonmuscle-invasive bladder cancer (NMIBC) is characterized by a high recurrence rate and progression to muscle-invasive disease concerns a significant number of patients. To overcome limitations of initial transurethral resection of bladder tumor (TURBT), various strategies are proposed in the literature. One of them is performance of restaging TURBT (re-TURBT). In recent years, it has been shown that re-TURBT can provide valuable additional pathologic information. However, its potential effect on survival improvement is debatable and benefits from this procedure have been suggested to be dependent on several clinicopathological factors (e.g., the presence of detrusor muscle in initial TURBT). A systematic search was conducted within the three electronic databases, including Medline, Scopus, and Embase. The following outcomes were retrieved: outcome measurements of recurrence-free survival (RFS), progression-free survival (PFS), cancer-specific survival (CSS), and overall survival (OS), including hazard ratios and 95% confidence intervals. Initially, a main analysis for each outcome (RFS, PFS, CSS, and OS) was performed. Subsequently, we conducted subgroup analyses for the following factors: T1 grade, presence of detrusor muscle in initial TURBT, and type of adjuvant intravesical therapy. Finally, six studies with overall 3257 participants were identified for this meta-analysis. A significant impact of re-TURBT on RFS, PFS, CSS, and OS was not found in the overall analysis that included all patients with T1 bladder tumors. On the other hand, subgroup analyses, including studies reporting cohorts with mixed T1 tumor grading, revealed that re-TURBT was associated with significantly better RFS, PFS, and OS. This meta-analysis shows that re-TURBT does not improve survival outcomes in patients with T1 tumors; however, results of some particular subgroup analyses indicate its potential positive impact on the subsequent course of the disease. Furthermore, high-quality, prospective, randomized controlled trials are necessary to make a final statement about the therapeutic role of re-TURBT in T1 NMIBC.