Abstract Recurrence-free survival and 5-year survival rates are still commonly used as prognostic indicators for gastrointestinal cancer. We believe that there is a need to find an appropriate index to evaluate changes in health status over time in postoperative patients. We evaluated changes in "frailty" after esophageal cancer surgery using the Kihon Checklist (KCL) developed by the Japanese Ministry of Health, Labour and Welfare, and examined risk factors for worsening health status after surgery. Twenty-four patients (21 thoracoscopic sub-total esophagectomy, 1 mediastinoscopic sub-total esophagectomy, and 2 total laryngopharyngoesophagectomy) who underwent esophageal cancer surgery in our department from December 2019 to April 2021 were included. Patients were asked to write down their KCL before surgery and one year after surgery at an outpatient clinic, and changes over time were checked. We compared the background factors in the "maintain" group (M group) and the "worsened" group (W group), and investigated the risk factors for pre-frail and frail states one year after the surgery. 8 patients worsened from robust to pre-frail to frail and pre-frail to frail, and 16 patients maintained their condition, with 33% of them worsening. Age (M/W: 70/72, p=0.296), male (M/W: 0.88/1.0, p=0.536), BMI (M/W: 22.4/19.6, p=0.142), pStage≥3 (M/W: 0.38/0.38, p=1.0), preoperative chemotherapy (M/W: 0.69/0.63, p=1.0), operative time (M/W: 566/610 minutes, p=0.327), blood loss (M/W: 103/151 ml, p=0.342), postoperative pneumonia (M/W: 0.25/0.25, p=1.0), and cancer recurrence (M/W: 0.19/0.50, p=0.167). The preoperative blood samples were Alb (M/W: 4.3/3.8 g/dl, p=0.046), Hb (M/W: 14.2/12.8 g/dl, p=0.015) and Cre (M/W: 0.85/0.79 mg/dl, p=0.713). At 1 year after esophageal cancer surgery, health worsened and 33% of patients were in a pre-frail or frail state. Risk factors for worsening health were low Alb and low Hb, which were not related to stage or actual age. Further study is needed to clarify risk factors for frailty.
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