Figure 1: Diffuse proliferation of tumor cells with round regular nuclei and single central eosinophilic nucleoli, and moderate amounts of basiphilic cytoplasm. Gland-like arrangement of tumor cells was locally seen in C (A, HE 100�; B, HE 400�; C, HE 400�). Immunostains of EMA(D), VS38c(E), ALK(F) (EnVision two-step: D, 100�; E, 200�; F, 400�).