We found that overall relapse samples gained coding region nonsynonymous SNVs in 305 genes, among which only 71 were mutated in other previously reported primary DLBCL genomic sequencing studies, including BCL2, EP300, KMT2D, MYC, TET2, and TNFRSF14 [17–20]. The gene discussed is TET2; the disease is diffuse large B-cell lymphoma.