BACKGROUND: The addition of chemoradiation (CRT) to surgery has been shown to improve survival in patients with esophageal cancer. In the current study, the authors determined whether the sequencing of CRT has an effect on survival and cardiopulmonary mortality in patients with esophageal cancer. METHODS: Patients with the following inclusion criteria were identified within 17 Surveillance, Epidemiology, and End Results registries from 1988 through 2007: adenocarcinoma or squamous cell carcinoma of the esophagus and having undergone esophagectomy. Patients who died within 90 days of surgery were excluded. Demographic, tumor, and survival data were compared between patients receiving preoperative and postoperative RT. Cox proportional hazards regression models were calculated to identify parameters associated with cause-specific survival and overall survival. A competing risk analysis was performed to account for death due to esophageal cancer in the calculation of cardiopulmonary mortality. RESULTS: Of 5512 patients, 1881 received preoperative RT, 901 received postoperative RT, and 2730 did not receive RT. Patients receiving preoperative RT had improved 5-year cause-specific survival (41% vs 31%; P < .0001) and overall survival (33% vs 23%; P < .0001) compared with those receiving postoperative RT. No differences in adjusted cardiopulmonary mortality were found between patients who received RT versus those who did not (8% vs 10% at 10 years; hazards ratio [HR] KEYWORDS: esophageal neoplasms, combined modality therapy, radiation oncology, survival, heart diseases, lung diseases.
INTRODUCTIONIn patients with locally advanced esophageal cancer, the addition of chemoradiation (CRT) to surgery has shown improvements in overall survival (OS) when given preoperatively. [1][2][3][4][5][6] In the subset of patients with tumors of the gastroesophageal junction, CRT delivered postoperatively has also demonstrated a survival benefit. 7 To the best of our knowledge, no randomized controlled trials currently exist that compare the outcomes of the sequencing of CRT in relation to surgery in patients with esophageal cancer.Preoperative CRT is preferred over postoperative treatment in patients with other gastrointestinal malignancies such as rectal cancer, in whom preoperative CRT has been demonstrated to have a superior locoregional control rate, toxicity profile, and survival rate. 8,9 It is postulated that preoperative treatment is favored because of tumor downstaging and smaller radiation treatment fields. We hypothesized that preoperative RT is associated with decreased cardiopulmonary mortality from lower RT doses to the heart and lungs as well as improved survival outcomes compared with postoperative RT in patients with esophageal cancer.Using the National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) database, we assessed differences in survival outcomes between patients treated with preoperative RT and those treated with postoperative RT and analyzed the effect of RT on heart and lung morbidity a...