Pro103Ser in ZNF800 does not associate with other autoimmune diseases or with cancer overall, but is associated with ovarian cancer (OR = 1.29, P = 8.1 × 10−5) and breast cancer (OR = 1.10, P = 3.2 × 10−5) in the same direction as with AITD and the signals co-localize. This evidence concerns the gene ZNF800 and ovarian cancer.