[Clinical Benefits of Transurethral Resection Under Narrow Band Imaging for Non-Muscle Invasive Bladder Cancer].

The aim of this study was to reveal the clinical benefits of transurethral resection (TUR) under narrow band imaging (NBI-TUR) for non-muscle-invasive bladder cancer (NMIBC) compared with conventional white light imaging TUR (WLI-TUR). The subjects were 172 patients with NMIBC who were followed for more than 1 year after undergoing TUR with no additional postoperative treatment. In the WLI-TUR group (n=101), lesions that were detected as positive after systematic intravesical observation under WLI were resected completely under WLI. In the NBI-TUR group (n=71), similar observations under WLI were followed by systematic intravesical observation under NBI. After multiple site biopsy under NBI, TUR was performed for all lesions that were detected as positive under NBI. The sensitivity was calculated based on the results of cystoscopy and pathology of multiple site biopsy samples under WLI and NBI in the NBITUR group. The tumor recurrence rate was analyzed in both groups. Background factors did not differ significantly between the two groups, except for the observation period (63.3 months in the WLI-TUR group vs 42.0 months in the NBI-TUR group, p<0.01). The procedure under NBI had significantly higher sensitivity (94.6% vs 75.0%, p<0.01) compared with that under WLI. The recurrence-free rate in the NBITUR group was significantly higher than that in the WLI-TUR group (p=0.013). The tumor recurrencefree rate of NBI-TUR is higher than that of conventional WLI-TUR for patients with NMIBC.