The Postoperative Recovery Course of Skeletal Muscle Mass in Older Esophageal Cancer Patients

Abstract

Purpose. Skeletal muscle mass (SMM) is an important biomarker for health in older cancer patients. However, there is limited information on the recovery course of SMM after esophagectomy in older patients. This study aimed to investigate the recovery course of SMM after esophagectomy and the predictors in older cancer patients. Methods. We conducted a single-center, retrospective cohort study. Esophageal cancer patients who underwent esophagectomy were included. The skeletal muscle mass index (SMI) was calculated using computed tomography images. The loss of SMI at 4 and 12 months after surgery was calculated as [(preoperative − postoperative SMI) ÷ preoperative SMI] × 100%. Nonrecovery was defined as an SMI loss of ≥2% at 12 months after surgery, considering physiological loss with aging. One-way analysis of variance and multivariate logistic regression analysis was used for statistical analysis. Results. A total of 105 older (≥70 years) and 156 nonolder (<70 years) patients were analyzed. Older patients had a significantly larger loss of SMI 4 months (mean: 5.7% vs. 3.1%; $p=0.021$ ) and 12 months (mean: 1.0% vs. −1.4%; $p=0.040$ ) after surgery than nonolder patients. In older patients, the number of patients with nonrecovery of SMI at 12 months after surgery was 55 (52%). In older patients, significant predictors for the nonrecovery of SMI were preoperative sarcopenia (adjusted OR: 0.297; $p=0.012$ ), neoadjuvant chemotherapy (adjusted OR: 0.248; $p=0.015$ ), and loss of SMI 4 months after surgery (per 1%; adjusted OR: 1.076; $p=0.018$ ). Conclusions. It is suggested that older esophageal cancer patients have a larger unmet need for long-term postoperative loss of SMM than nonolder patients. Continuous outpatient rehabilitation, including exercise and nutritional therapy after discharge, which targets improvement in SMM at 4 months, may improve SMI at 12 months after surgery in older esophageal cancer patients.