CD99 and neoplasm: Immunohistochemically, the tumor cells were strong positive for CD56, CD3ε, TIA1 (Figure 3), and weak positive for LMP1, and negative for CD5, CD8, CD20, CD79a, CgA, Syn, SCLC, CK, EMA, CD99, CD10, TdT, PAX-5, and BCL-6.