RT Journal Article SR Electronic T1 Cancer surgery cancellation: incidence, outcomes and recovery in a universal health care system JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP E782 OP E791 DO 10.1503/cjs.012521 VO 65 IS 6 A1 Antoine Eskander A1 Claudia Zanchetta A1 Natalie Coburn A1 Danny Enepekides A1 Lilian T. Gien A1 Reeza Menalo A1 Gener Austria A1 Ordeena Linton A1 Sue Su-Myat A1 Olga Yermakhanova A1 Jonathan Irish YR 2022 UL http://canjsurg.ca/content/65/6/E782.abstract AB Background: Cancer surgery cancellation can have negative consequences for the patient, the surgeon and the health care system. There is a paucity of literature on cancer surgery cancellation and its association with wait times, perioperative outcomes, survival and costs of care. Therefore, the objective of this study was to determine the incidence of same-day cancer surgery cancellation in a universal health care context and its association with short and long-term outcomes.Methods: This was a population-based retrospective cancer cohort study in Ontario, Canada (2010–2016). There were 199 599 patients in the control cohort and 3539 patients in the cohort that experienced a cancellation. We assessed the cohorts for differences in survival, perioperative complications and costs of care.Results: The overall cancellation rate was 1.74% and was predicted by cancer type (genitourinary), lower income quintile, and more central region of residence. Wait times in the cancelled cohort were longer than in the control cohort; however, this difference was not associated with worse survival outcomes. Patients in the cancelled cohort had higher complication rates while in hospital (7.3 %) than those in the control cohort (4.9%; p < 0.01). After adjusting for important confounders, the cancelled cohort was more costly ($1100).Conclusion: Same-day cancer surgery cancellation rates were low. They were associated with longer wait times, higher complication rates and increased costs of care. Survival was not worse in the cancelled cohort, suggesting that appropriate cancer urgency prioritization occurs. Preventable causes of cancellation should be targeted to improve outcomes in patients with cancer.