The fact that we observe a decrease of the WID-OC-index from serous to clear cell/endometrioid to mucinous cancers again suggests a “shift” of epigenetic differentiation (i.e. differentiation of fallopian tube reflected in cervical epithelial cells) predisposes individuals to ovarian cancer formation; (iv) given that the index is more discriminatory in samples with a high epithelial cell content and that the index almost exclusively consists of CpGs, which are highly variable in epithelial but not in immune cells, attests to this. This evidence concerns the gene BGLAP and ovarian carcinoma.