STAT3 and ovarian cancer: Amongst the seven genes, only STAT2 and STAT3 showed no effect on the OS of ovarian cancers, i.e. high mRNA expression of STAT1, STAT4, STAT5a, STAT5b, and STAT6 was correlated to a better OS for ovarian cancer patients, especially the high level of STAT1 and STAT4 was significantly related to a favorable OS for serous ovarian cancer patients.