• R A Malthaner, S Collin, and D Fenlon.
• University of Western Ontario, Division of Thoracic Surgery, London Health Sciences Centre, 375 South Street, Suite N345, London, Ontario, Canada N6A 4G5. richard.malthaner@lhsc.on.ca
• Cochrane Db Syst Rev. 2006 Jul 19 (3): CD001556.

BackgroundSurgery has been the treatment of choice for localized esophageal cancer. A number of studies have investigated whether preoperative chemotherapy followed by surgery leads to an improvement in cure rates but the individual reports have been conflicting. An explicit systematic update of the role of preoperative chemotherapy in the treatment of resectable thoracic esophageal cancer is, therefore, warranted.ObjectivesThe objective of this review is to determine the role of preoperative chemotherapy on patients with resectable thoracic esophageal carcinomas.Search StrategyTrials were identified by searching the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE (1966 to 2006), EMBASE (1988 to 2006) and CANCERLIT (1993 to 2002). There were no language restrictions.Selection CriteriaAll trials of patients with potentially resectable carcinomas of the esophagus (of any histologic type) who were randomised to having either chemotherapy or no chemotherapy before surgery.Data Collection And AnalysisThe primary outcome was survival, which was assessed using hazard ratios. This is an amendment to the original review which used relative risks to assess survival at yearly intervals. Hazard ratios (HR) have now been introduced to summarise the complete survival experience in a single analysis. The risk ratio (relative risk; RR) was used to compare rates of resections, tumour recurrences and treatment morbidity and mortality.Main ResultsThere were eleven randomised trials involving 2019 patients. Eight trials (1729 patients) reported sufficient detail on survival to be included in a meta-analysis for the primary outcome. There was some evidence to suggest that preoperative chemotherapy improves survival, but this was inconclusive (HR 0.88; 95% CI 0.75 to 1.04). There was no evidence to suggest that the overall rate of resections (RR 0.96, 95% CI 0.92 to 1.01) or the rate of complete resections (R0) (RR 1.05; 95% CI 0.97 to 1.15) differ between the preoperative chemotherapy arm and surgery alone. There is no evidence that tumour recurrence (RR 0.81, 95% CI 0.54 to 1.22) or non-fatal complication rates (RR 0.90; 95% CI 0.76 to 1.06) differ for preoperative chemotherapy compared to surgery alone. Trials reported risks of toxicity with chemotherapy that ranged from 11% to 90%.Authors' ConclusionsIn summary, preoperative chemotherapy plus surgery may offer a survival advantage compared to surgery alone for resectable thoracic esophageal cancer, but the evidence is inconclusive. There is some evidence of toxicity and preoperative mortality associated with chemotherapy.

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