IHC: immunohistochemistry; ALCL: anaplastic large cell lymphoma; DLBL: diffuse large B-cell lymphoma; MALT: mucosa-associated lymphoid tissue lymphoma; R: radiotherapy; C: chemotherapy; S: surgery; ESD: endoscopic submucosal dissection; ND: not described; LCA: leukocyte common antigen; TIA: T-cell intracellular antigen-1; ALK: anaplastic lymphoma kinase; EBERs: Epstein-Barr virus-encoded RNA. The gene discussed is PTPRC; the disease is anaplastic large cell lymphoma.