BACKGROUND: Secondary tumors of the ovary (STOs) account for 10-25% of all ovarian malignancies, including metastases from primary gynecological tumors. Colorectal cancer (CRC) has been recognized as one of the most common causes of STOs in Western countries. Despite it being well-known that CRC originating from the right versus left side of the colon/rectum differ substantially, there is a paucity of information regarding the effect of the primary tumor sidedness on the clinicopathological characteristics of STOs. METHODS: This retrospective, observational chart review study included patients with histologically confirmed STOs of CRC origin diagnosed between January 2000 and December 2019. The clinicopathological characteristics of STOs originating from left-sided and right-sided CRC were compared. Univariable and multivariable analyses employing elastic net Cox proportional hazard models were used to evaluate potential prognostic factors. Further, the role of imaging methods in STOs diagnostics was evaluated. RESULTS: Fifty-one patients with STOs of colorectal origin were identified. The primary tumor originated in the right and left colon/rectum in 39% and 61% of the cases, respectively. STOs originating from right-sided primary tumors were more frequently bilateral, associated with peritoneal carcinomatosis, had the ovarian surface affected by the tumor, and contained a mucinous component. The independent prognostic factors for overall survival in the whole cohort included: the presence of macroscopic residual disease after cytoreductive surgery, menopausal status, the application of systemic therapy, and the application of targeted therapy. In 54% of cases, the imaging methods failed to determine the laterality of the STOs correctly as compared to pathological reports and/or intraoperative findings. CONCLUSION: STOs originating from left-sided and right-sided CRC show distinct clinicopathological characteristics. Moreover, different metastatic pathways might be employed according to the primary tumor sidedness. Considering the discrepancies between radiological assessment and histopathological findings regarding the laterality of STOs, bilateral adnexectomy should be advised whenever feasible.

Department of Gynecology 1st Private Surgical Center Ltd Sanus Hradec Králové Labská kotlina 1 1220 50002 Hradec Králové Czech Republic

Department of Medical Biophysics Faculty of Medicine in Hradec Králové Charles University Šimkova 870 50003 Hradec Králové Czech Republic

Department of Obstetrics and Gynecology Faculty of Medicine and University Hospital in Hradec Králové Charles University Sokolská 581 50005 Hradec Králové Czech Republic

Department of Oncology and Radiotherapy Faculty of Medicine and University Hospital in Hradec Králové Charles University Sokolská 581 50005 Hradec Králové Czech Republic

The Fingerland Department of Pathology Faculty of Medicine and University Hospital in Hradec Králové Charles University Sokolská 581 50005 Hradec Králové Czech Republic

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