Treatment algorithm for CD20⁺ PTLD. Chemo, chemotherapy; IC treatments, recommended treatments for immunocompetent patients; IS, immunosuppression; QW, once a week; Q3W, every 3 weeks; RCHOP, rituximab–cyclophosphamide–doxorubicin hydrochloride–vincristine–prednisone; Ritux, rituximab; V, vedotin.