Two SNPs were found to be associated with MM susceptibility: rs3219090*A, located on the PARP1 gene and implicated in cell repair, is associated with protection from MM using the genotypic model with OR 0.79, 95% CI 0.63-0.97; p-value 0.027, and rs12203592*T, located in the IRF4 gene, implicated in the immune response, which is associated with MM risk, when the recessive model is considered with OR 6.28, 95% CI 1.45-27.13; p-value 0.014. Here, IRF4 is linked to Miyoshi myopathy.