ERCC6 and breast cancer: Haplotype and diplotype analysis did not reveal any statistically-significant associations in the entire BPC3 dataset; however, when stratified by cohort, significant association of ERCC6 Hap 6 (OR 1.65, 95% CI 1.02–2.68, p = 0.04) with breast cancer was detected in PBCS (results not shown).