| Summary: | Because of their reluctance to visit the hospital due to concerns about contracting coronavirus disease 2019 (COVID-19), patients with colorectal cancer have been affected by delays in care during the pandemic. This study assessed the effects of the pandemic on the clinical characteristics and surgical treatment patterns of colorectal cancer patients at a tertiary medical facility in Korea. Patients who underwent colorectal cancer surgery at our institution between March and September 2020 were analyzed. Clinicopathological and treatment characteristics were compared with those of patients who underwent surgery in 2018 and 2019. The patients who did not undergo tumor resection (4.1% vs. 1.8%, <i>p</i> < 0.001) and who received neoadjuvant treatment (16.7% vs. 14.7%, <i>p</i> = 0.039) were significantly higher during the COVID period. The minimally invasive approach was performed less during the COVID period (81.2% vs. 88%, <i>p</i> < 0.001). More patients in the COVID period required combined resection of organs adjacent to the tumor (4.8% vs. 2.8%, <i>p</i> = 0.017). Surgical aggressiveness, as shown by the proportion of patients undergoing minimally invasive surgery and adjacent organ resection, was significantly influenced by the pandemic. In addition, resectability decreased during the COVID period. These characteristics will likely influence long-term oncological outcomes, indicating the need for long-term monitoring of this cohort.
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