Relationship between nutritional status and esophageal fistula formation after radiotherapy for esophageal cancer.

Chemoradiotherapy and radiotherapy for esophageal cancer sometimes cause esophageal fistulas. Esophageal fistulas often require additional procedures and are associated with a high mortality rate. The present study was conducted to determine the risk factors associated with esophageal fistulas in patients with esophageal cancer. We reviewed the cases of 206 patients who were treated with definitive radiotherapy for esophageal cancer. The planning dose, which ranged from 44 to 64.8 Gy (median: 59.4 Gy), was delivered to the primary lesion and regional lymph nodes. Descriptive statistics were calculated, and time-to-event analyses were performed using Cox proportional hazards regression analysis. None of the 68 patients with T1 or T2 esophageal cancer developed esophageal fistulas. Among the 138 patients with T3 or T4 esophageal cancer, esophageal fistulas were detected in 20 (14.5%) patients. Multivariate analysis of the 138 patients with T3 or T4 esophageal cancer revealed low body mass index (BMI) to be an independent risk factor for esophageal fistula formation (P = 0.0055). The optimal BMI cut-off value for predicting esophageal fistula formation was 20 kg/m2 (P = 0.0121, odds ratio = 4.130). In patients with esophageal cancer treated with definitive radiotherapy, a BMI below 20 kg/m2 is a risk factor for esophageal fistula formation. A well-designed randomized controlled trial comparing the incidence of esophageal fistulas between patients with esophageal cancer who do and do not receive nutritional support before radiotherapy is required. [ABSTRACT FROM AUTHOR]