Sarcopenia Predicts Postoperative Complications and Survival of Colorectal Cancer Patients Undergoing Radical Surgery

<b>Aims/Background</b> Previous literature has indicated that sarcopenia is related to poor outcomes after radical resection for colorectal cancer (CRC). However, its effect on the postoperative clinical outcomes of CRC remains controversial. This study aimed to elucidate the predictive value of sarcopenia for postoperative complications and survival in CRC patients. <b>Methods</b> This investigation retrospectively assessed the clinical data of 226 CRC patients who underwent radical resection at the Department of Gastrointestinal Surgery, Affiliated Hospital of Zunyi Medical University from January 2018 to December 2020. Sarcopenia was diagnosed according to the recommendations of the Asian Working Group for Sarcopenia in 2019, and patients were categorized into sarcopenia and non-sarcopenia groups. Multivariate and univariate analyses were employed to assess the risk factors for postoperative complications. The Kaplan-Meier method and survival curve were used to analyze postoperative survival time. Cox proportional hazards regression models were used to evaluate risk factors affecting the prognosis of CRC patients. <b>Results</b> This investigation included 226 patients, of which 68 were diagnosed with sarcopenia. Furthermore, it was revealed that sarcopenia was linked with older age (<i>p</i> < 0.001), low body mass index (<i>p</i> < 0.001), high prevalence of diabetes (<i>p</i> = 0.002), high cystatin level (<i>p</i> = 0.017), and low 3rd lumbar spine (L3) planar skeletal muscle index (<i>p</i> < 0.001), but was not related to the tumour stage or the gender. Moreover, sarcopenia was also correlated with increased occurrence of all postoperative complications (<i>p</i> = 0.050). The results of the multivariate analysis indicated that sarcopenia was an independent risk factor for postoperative complications (odds ratio (OR): 7.154; 95% confidence interval (CI): 2.261-22.633; <i>p</i> = 0.017). The Kaplan-Meier analysis revealed that sarcopenia patients had significantly lower 5-year disease-free survival (DFS) (48.5% vs 59.5%; log-rank <i>p</i> = 0.033) and 5-year overall survival (OS) (57.4% vs 77.2%; log-rank <i>p</i> < 0.001) rates. Sarcopenia was an independent risk factor for poor DFS (hazard ratio (HR) = 1.404; <i>p</i> = 0.016) and OS (HR = 1.290; <i>p</i> = 0.021). <b>Conclusion</b> In CRC patients undergoing radical surgery, sarcopenia is an independent risk factor for postoperative complications. Sarcopenia may be a predictive factor for the prognosis and survival of CRC patients undergoing radical resection.