17+ Small Cell Neuroendocrine Carcinoma Bladder US . Bladder small cell neuroendocrine carcinomas most frequently harbor alterations in tp53, rb1, crebbp, kmt2d, and fgfr1 2. Small cell neuroendocrine carcinoma represents an extrapulmonary variant of small cell lung cancer. Pathology Outlines - Large cell neuroendocrine carcinoma from www.pathologyoutlines.com In 95% of patients it presents. Keywords oat cell carcinoma, small cell undifferentiated carcinoma, immunocytochemistry, ultrastructure, neuroendocrine differentiation. Large cell neuroendocrine carcinoma (lcnc) is one of the rarest types of bladder cancer occurring in <1%. Small cell neuroendocrine carcinoma represents an extrapulmonary variant of small cell lung cancer. Large cell neuroendocrine carcinoma of the urinary bladder: Review of the literature and review of a case. Rosen pp, fechner re, eds. 284400 definition smal...