Combination of PD-1 inhibitor with GVD (gemcitabine, vinorelbine, liposomal doxorubicin) versus GVD regimen as second-line therapy for relapsed/refractory classical Hodgkin lymphoma. - Zhang YC; Wang JN; Ma SY; Cai J; Su N; Huang HQ; Li ZM; Xia ZJ; Huang H; Liu PP; Xia Y; Cai QQ (British journal of haematology, 2022)