Skeletal muscle loss in the postoperative acute phase after esophageal cancer surgery as a new prognostic factor
Abstract Background: The postoperative survival rate of patients with esophageal squamous cell carcinoma (ESCC) remains poor compared with other gastrointestinal cancers. We hypothesized that skeletal muscle loss (SML) in the postoperative acute phase might be a new predictor for long-term prognosis after highly invasive surgery such as ESCC surgery.Methods: The following items were retrospectively investigated. First, whether SML occurred in the postoperative acute phase of ESCC was verified. Second, the preoperative and intraoperative factors involved in SML in the postoperative acute phase of ESCC were investigated. Then, whether SML in the postoperative acute phase affected long-term prognosis was examined. The medical records of consecutive patients who underwent radical esophagectomy for ESCC were retrospectively reviewed; 72 cases were eligible for this study.Results: There was already a significant difference between the total psoas major muscle mass index (TPI) of the acute phase up to 3 days after surgery and the preoperative baseline TPI. The psoas muscle loss index (PMLI) was significantly milder in cases with less blood loss during surgery and in cases that underwent thoracoscopic esophagectomy than in cases that underwent open esophagectomy. The three-year overall survival rate was significantly different between the PMLI severe group and the PMLI mild group.Conclusion: SML occurred even in the postoperative acute phase. Furthermore, it is very significant that SML in the postoperative acute phase of ESCC surgery is involved in the long-term prognosis.