Significant activity of single agent vinorelbine against small-cell cancer of the bladder as second line chemotherapy: a case series and review of the literature.

Small-cell carcinoma of the urinary bladder is an extremely uncommon form of urologic malignancy, accounting for less that 1% of new cases of bladder cancer. It is an aggressive malignancy which, like its pulmonary counterpart, tends to spread with distant metastases. This malignancy is generally chemotherapy and radiotherapy sensitive.