HMOX2 and myeloid sarcoma: Data from the present case-control association study suggest a weak association between the allelic variants HMOX2 rs1051308A and HMOX1 rs2071746A with the risk for MS (although only HMOX2 rs1051308A was finally associated after multiple comparison analysis), while the other 2 studied SNPs in the HMOX gene were not associated with a modification of MS risk.