Patients with classic Hodgkin lymphoma (CHL)‐type methotrexate‐associated lymphoproliferative disorder (MTX‐LPD) with high programmed cell death‐ligand 1 (PD‐L1) expression tended to have exacerbations and relapses after MTX discontinuation. The gene discussed is CD274; the disease is disseminated peritoneal leiomyomatosis.