<prompt> Ovarian tumours are commonly arise fromStromaSurface epitheliumGerminal epitheliumEndodermal  <response>: Surface epithelium 397-S 333-S14thOvarian cancers Epithelial ovarian cancers accounts for 80 to 90 of ovarian cancers Non-epithelial cancers account for 10 to 20These include malignancies of:I Germ cell originII Sex cord stromal cell originIII Metastatic cancersIV Rare malignancies like lipoid cell tumours sarcomas 