It also identified a significant association between SNPs, suggesting that the A and B antigens can be associated with an increased risk of pancreatic cancer, i.e., blood group O carries a lower risk of the disease.42Returning to the question from the beginning of the discussion, we can conclude from our results and literature that for the research on the link between the ABO system and the incidence of BC, blood group typing at the gene level is more appropriate than an immunohistochemical analysis at the antigen level. The gene discussed is ABO; the disease is breast cancer.