In DLBCL NOS in other organs (n = 30), the most common mutations were PIM1 (n = 13, 43.3%), MYD88L265P (n = 12, 40.0%), TP53 (n = 10, 33.3%), and CD79B (n = 10, 33.3%). Here, PIM1 is linked to diffuse large B-cell lymphoma.