Seventy-one of the genes listed on Supplemental Table S4 had been previously noted to be differentially expressed in at least one of these reports, and two genes TACSTD1 (encoding tumor-associated calcium signal transducer 1) and WFDC2 (encoding whey acidic protein type, four-disulfide core domain 2, or putative ovarian carcinoma marker HE4) had been noted in five and six previous reports, respectively, suggesting that overexpression of these genes may play critical roles in the early stages of ovarian tumorigenesis. Here, WFDC2 is linked to ovarian carcinoma.