CD30 expression has been consistently reported in CD30+ lymphoproliferative disorders (LPDs)15 but differs in conditions such as MF/SS, hydroa vacciniforme‐like LPDs, peripheral T‐cell lymphoma, not otherwise specified (PTCL and NOS), and adult T‐cell leukemia/lymphoma. The gene discussed is TNFRSF8; the disease is synovial sarcoma.