1. Warren S, Gates O. Multiple primary malignant tumors: survey of the literature and a statistical study. Am J Cancer 1932; 16: 1358-1414
2. Multiple primary tumours: challenges and approaches, a review
3. Meeks MW, Grace S, Chen Y, Petterchak J, Bolesta E, Zhou Y, Lai JP. Synchronous Quadruple Primary Neoplasms: Colon Adenocarcinoma, Collision Tumor of Neuroendocrine Tumor and Schwann Cell Hamartoma and Sessile Serrated Adenoma of the Appendix. Anticancer Res 2016; 36: 4307-4311
4. Metastatic and independent cancers of the endometrium and ovary: A clinicopathologic study of 34 cases
5. Prognosis of women with stage I endometrioid endometrial cancer and synchronous stage I endometrioid ovarian cancer