Deletions in three genes were associated with increased risk of breast cancer (DOCK5, P = 3 × 10-3; OR4C11, P = 2 × 10-2; and OR4P4, P = 3 × 10-2). qPCR did not confirm the small 646-base-pair deletion at the DOCK5 locus (Table 4). This evidence concerns the gene OR4P4 and breast carcinoma.