Inclusion criteria included (1): the primary lesion was located in the stomach or colorectum and was diagnosed as KTs following differentiation from primary malignant or benign ovarian tumor, as revealed by pathological examination and (2) clinical data were complete, pathological wax blocks were well-preserved, and long-term follow-up data were obtained.
Exclusion criteria included (1): other tumors or intestinal diseases (2); primary foci originating from other sites, such as breast, appendix, and cervix; and (3) patients who simply received medical treatment, out-of-hospital surgery, or just received pathological consultation in our hospital.