TNFRSF8 and classic Hodgkin lymphoma: In lymphoma, CD30, as an important diagnostic biomarker, is universally expressed in classical Hodgkin lymphoma (cHL) and anaplastic large cell lymphoma (ALCL), but in other lymphoproliferative disorders, such as diffuse large B‐cell lymphoma (DLBCL), peripheral T‐cell lymphoma (PTCL) and cutaneous T‐cell lymphoma (CTCL), it is also expressed to variable degrees.2