CTLA4 and lymphoma: In our study on B-cell lymphoma, CTLA4 rs231775 was not associated with lymphoma risk, with minor allele frequencies of 0.37 in the DLBCL cohort (sample size 111) and in the European population at large (ALFA sample size 509524, ncbi.nlm.nih.gov/snp/, access date 22 July 2025).