For primary central nervous system lymphoma (PCNSL), which is a specific extra‐nodal subtype of DLBCL with molecular similarities to MCD type or C5 with frequent mutations in MYD88 and CD79B [26, 27], SAMD14/neurabin‐I were recently identified by us as an antigen of the BCRs. The gene discussed is PPP1R9A; the disease is primary central nervous system lymphoma.