Immunohistochemically, the tumor cells were cytokeratin -, vimentin +, CD3+ (Figure 3B), CD45RO+, CD5-, CD7-, CD4-, CD8-, CD10-, CD20- (Figure 3C), CD30-, CD79a-, CD138-, CD56- (Figure 3D), granzyme B-, TIA-1 cytotoxic granule-associated RNA binding protein (TIA-1) + (Figure 3E) and ALK-. The gene discussed is CD5; the disease is neoplasm.