The high level of PNPO mRNA expression was also found in serous (n = 41), mucinous (13) and endometrioid (n = 37) adenocarcinoma as well as in clear cell carcinoma (n = 8) compared with normal ovary (n = 4) in the microarray data sets of Hendrix from Oncomine database (www.oncomine.org) (Supplementary Figure S8). This evidence concerns the gene PNPO and clear cell adenocarcinoma.