highly significantP < 1e-10
On applying a relaxed threshold of FDR <0.3 we observed a total of 2,514 BRCA1 -mutation associated CpGs, of which 1,422 (57%) were hypermethylated (hyperM) and 1,092 (43%) were hypomethylated (hypoM) in women who had a BRCA1 mutation (Figure 1 , Additional file 5 ), representing a highly significant skew towards hypermethylated CpGs (Binomial test P < 1e-10).