On immunohistochemical (IHC) staining, the tumor cells were positive for CD4, CD56, leukocyte common antigen (LCA), and Bcl2, focally positive for CD68, terminal deoxynucleotidyl transferase (TdT), and negative for any specific markers of common myeloid, T-cell, B-cell, or monocytic-cell lineages (CD3, CD10, CD20, CD34, MPO) or Epstein-Barr virus encoded RNA (Fig. 1D). Here, PTPRC is linked to neoplasm.