KRT5 and sarcomatoid carcinoma: Correspondingly, a positive TTF-1 (clone SPT24) in ≥10% of the tumor cells and/or presence of obvious glands in the TMA sections identified 404 (97%) of 416 AC but also included 25 of 33 neuroendocrine tumors, 6 of 194 SqCC (all positive for CK5 and p40 and negative for TTF-1 clone 8G7G3/1 and napsin A) and three sarcomatoid carcinomas.