Evaluation of preoperative visceral fat area / psoas muscle area ratio and prognosis in patients with colorectal cancer.

BACKGROUND

Recent research has focused on the prognostic relevance of preoperative sarcopenia and sarcopenic obesity in various cancers. In this study we investigated the relationship between visceral fat area (VFA), psoas muscle area (PMA), and the prognosis of patients undergoing colorectal cancer surgery.

METHODS

Patients with stage III colorectal cancer who underwent surgery between July 2013 and April 2020 were included. The analysis was performed on 151 patients who met the criteria. The VFA and PMA were measured at the level of the third lumbar vertebra on computed tomography (CT) scans, and the ratio of VFA to PMA (V/P ratio) was determined.

RESULTS

Patients with high V/P ratios were significantly older ( = 0.0213), had a higher body mass index (BMI) ( < 0.0001), a higher percentage of sarcopenic obesity ( < 0.0001), and more diabetes complications ( < 0.0001). Prognostic analysis showed that the overall survival (OS) ( = 0.0154) and relapse-free survival (RFS) ( = 0.0378) were significantly worse in patients with a high V/P ratio. Multivariate analysis revealed that a high V/P ratio was an independent poor prognostic factor for OS. Subgroup analysis was then performed in patients with BMI < 25 kg/m. OS ( = 0.0259) and RFS ( = 0.0275) were significantly worse in the high V/P ratio group. A high V/P ratio was an independent poor prognostic factor in the multivariate analysis.

CONCLUSION

In colorectal cancer, the preoperative V/P ratio is an independent factor for poor prognosis. Preoperative evaluation of the V/P ratio may identify a wide range of high-risk patients because it is an independent poor prognostic factor in patients without obesity.