Affecting approximately 6% of persons older than 50 years, Barrett esophagus is a premalignant condition that increases the risk of developing esophageal cancer. However, the annual risk of progression to adenocarcinoma in the absence of high-grade dysplasia is low (0.12%-0.24%). Although expert consensus recommends endoscopic surveillance every 3 to 5 years in asymptomatic persons with Barrett esophagus, optimal intervals and the effectiveness of surveillance are not known.
A randomized controlled trial at 109 centers in the United Kingdom compared the outcomes of surveillance endoscopy every 2 years with “at need” endoscopy for symptoms only. In the trial, 3,453 participants with a recent diagnosis of Barrett esophagus with no or low-grade dysplasia were followed for a minimum of 10 years (mean 12.8 years). Symptoms that prompted endoscopy in the “at need” group included dysphagia, unexplained weight loss of more than 7 pounds, iron-deficiency anemia, recurrent vomiting, or worsening upper gastrointestinal symptoms. Within the participants, 93% of the surveillance group and 59% of the “at need” group received at least one endoscopy, with means of 3.5 and 1.4 endoscopies, respectively. Overall, 71 patients (2.1%) were diagnosed with esophageal cancer. There were no statistical differences in time to diagnosis of esophageal cancer, cancer stage at diagnosis, cancer-specific or overall survival.
Standard treatment for locally advanced esophageal cancer involves neoadjuvant chemoradiotherapy followed by esophagectomy. However, rates of serious postoperative complications (30%-50%), and in-hospital mortality (5%) are high. Active surveillance is a strategy to defer or avoid surgical complications in patients with a complete clinical response to chemoradiotherapy. A multicenter, cluster randomized, non-inferiority trial in 12 Dutch hospitals compared survival in 309 persons who received active surveillance vs esophagectomy within 2 weeks of chemoradiotherapy. Patients were eligible if they had no evidence of residual tumors on endoscopic biopsies, ultrasound, or PET-CT after chemoradiotherapy. After a median follow-up of 38 months, the intention-to-treat analysis found that a higher percentage of persons in the active surveillance group (75%) were alive than in the surgery group (70%). Those in the active surveillance group who underwent later surgery experienced similar postoperative complications as those who had standard surgery.
Although this study suggested that active surveillance may be a reasonable option for some with esophageal cancer, there are concerns about the durability of the findings beyond 2 years. A commentary on the study noted that the majority of patients do not have a complete response to chemoradiotherapy and would be ineligible for active surveillance. Surgeons outside of the trial also commented that the assessments for metastatic disease may not have been complete enough, resulting in many persons undergoing esophagectomy without benefit and reducing the apparent effectiveness of surgery.
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This post first appeared on the AFP Community Blog.
