Of note, out of 28 patients categorized under LGLL/LGLP category, a concurrently existing small clonal large granular lymphocytic population (LGLP) (CD3+CD8+CD56+CD57+ T cells) was detected in patients diagnosed with primary mediastinal B-cell lymphoma (PMBCL), T-cell rich B-cell lymphoma (TCRBCL), and cutaneous ALCL. The gene discussed is B3GAT1; the disease is T-cell large granular lymphocyte leukemia.