"Ovarian tumors" refers to abnormal growths or lumps that develop in the ovaries, which are part of the female reproductive system. These tumors can be either cancerous (malignant) or non-cancerous (benign). Full definition
And although most tumors in horses occur as they get older, this is not the case with ovarian tumors as these commonly occur in horses 5 to 9 years of age. (vin.com)
He previously revealed the existence of spontaneous immune responses in ovarian tumors as well as described how regulatory T cells and tumor blood vessels affect these responses. (cancerresearch.org)