ITGA4 and myeloid sarcoma: The intronic polymorphism (intron 17–18) ITGA4 rs6721763, located 929 bp away from the splicing site of exon 18 of ITGA4 gene, has been previously associated the MSSS in a dose-dependent manner and also with the MS risk, while the intronic rs17225354 has been associated with MS risk [30], [37].