We showed that the overall gene expression level of DNMT1 was higher in GC B cells in 22 diffuse large B‐cell lymphoma (DLBCL) patient samples in comparison to that of B cells in either 24 mantle cell lymphoma and 13 nodal marginal zone lymphoma patient samples (Figure S1), whereas p38γ expression was higher in mantle cell lymphoma than in DLBCL. The gene discussed is DNMT1; the disease is mantle cell lymphoma.