Rs743554

microRNA 749 Swedish incident breast cancer cases with detailed clinical data and up to 15 years of follow-up together with 1493 matched controls. The strongest association was between the rs743554(T) allele of the ITGB4 gene and estrogen receptor negative (ER-) tumors (odds ratio 2.09, CI: 1.19-3.67) and worse survival compared to the wild type genotype carriers (hazard ratio [HR] 2.11, CI: 1.21-3.68). The poor survival was significantly associated with the aggressive tumour characteristics: high grade, lymph node metastasis and high stage.