Long HCDR3 length was associated with higher PD-L1 expression in B cells in GCB-DLBCL (Fig. 3b; significant in the training set; marginally significant in the validation set) and higher PD-1 expression in CD4+/CD8+ T cells in ABC-DLBCL (Fig. 3b; significant in the validation set; strong trends in the training set). This evidence concerns the gene PDCD1 and diffuse large B-cell lymphoma.