In studies investigating the cause of increased MDSC production in patients with uterine cervical and endometrial cancers, an increased number of MDSCs was found to be associated with increased serum E2 concentrations [33], serum PGE2 concentrations [29,30], leukocytosis [21,22,29], tumor G-CSF concentrations [21,22,28,29], IL-6 expression [29], or number of cancer stem-like cells in tumors [29,30]. The gene discussed is CSF3; the disease is endometrial cancer.