The standard panel of immunostains used in the workup of a T-cell lymphoma includes CD20, CD2, CD3, CD4, CD5, CD8, CD30, CD56, TCR-β, TIA-1 (T-cell intracellular antigen 1), Ki67, and in situ hybridization assay for EBV (Epstein-Barr virus) encoded RNA (ribonucleic acid). This evidence concerns the gene CD4 and T-cell non-Hodgkin lymphoma.