PDGFRA and neoplasm: On immunohistochemistry, the tumor cells showed diffusely strong expression of CD34 (Fig. 3I) and PDGFRA (Fig. 3J); they were sporadically positive for S-100 protein and negative for CD117, DOG-1, smooth muscle actin, Caldesmon, ALK-80, ER, CD21, Bcl-2, STAT6, CD68, CD163, CD1a (Fig. 3K), and CD207 (langerin; Fig. 3L).