Multidisciplinary treatment for small cell carcinoma of the bladder: a case report.

Small cell carcinoma (SCC) of the urinary bladder is a rare and highly aggressive subtype of bladder cancer. Most cases are diagnosed at advanced stages, and its therapeutic strategy remains unestablished. Here, we report a case of bladder SCC in which multidisciplinary treatment has resulted in relatively long-term survival. A 68-year-old man presented with gross hematuria. A cystoscopy revealed an invasive bladder tumor. A transurethral resection of bladder tumor (TURBT) was performed, and the pathological diagnosis was SCC. After systemic chemotherapy using etoposide and carboplatin and subsequent TURBT, a radical cystectomy and ileal conduit were performed. Three months postoperatively, the patient had a recurrence in the para-aortic lymph node. Systemic combination chemotherapy with carboplatin plus irinotecan (CBDCA + CPT-11) was administered, followed by amrubicin and an immune checkpoint inhibitor. In addition to this treatment, radiation therapy for the metastatic region led to the reduction of pain and shrinkage of the metastatic lesion. The patient survived for 2 years after the initial diagnosis. Our report indicates that multidisciplinary treatment can be effective for SCC of the bladder, and a therapeutic strategy including the identification of novel biomarkers should be established.