MMP1 and breast cancer: Similarly, the converse of the haplotype MMP1 TCTC was inversely associated with breast cancer risk when looking at copy number for all women (OR 0.65, 95% CI 0.45,0.95 p = 0.027) and among women with the least Native American ancestry specifically (OR 0.60, 95% CI 0.40,0.91 p = 0.015).