Two independent pathologists confirmed the diagnosis of monomorhic PTLD, specifically diffuse large B-cell lymphoma (DLBCL), GCB subtype, “double expressor” phenotype, given the positive staining for BCL 2 positivity in ≥50% of tumor cells and MYC positivity in ≥40% of tumor cells (Figure 3). This evidence concerns the gene MYC and diffuse large B-cell lymphoma.