Tumor expression of Nectin-1–4 and its clinical implication in muscle invasive bladder cancer: An intra-patient variability of Nectin-4 expression

There is limited evidence regarding the tumor expression of nectins and their clinical implications in muscle invasive bladder cancer. Herein, we evaluated expression of Nectins 1-4 in 64 patients with muscle invasive bladder cancer who underwent radical cystectomy using a histochemical scoring method (H-score; immunohistochemical staining intensity multiplied by the percentage of positive-staining cells). The cutoff values were defined based on the median H-scores. Of the 64 patients, 45 (70%) had residual tumors in radical cystectomy specimens, while 13 (20%) had lymph node metastasis. The median (interquartile range) H-scores of Nectin-1, - 2, - 3, and - 4 expression were 0 (0-10), 80 (30-180), 5 (0-30), and 100 (33-160), respectively. The Nectin-4 H-score of the neuroendocrine variant was significantly lower than that of pure urothelial carcinoma (P = 0.015). Post-neoadjuvant chemotherapy pathological response (