June 20, 2005
Study Examines Characteristics of Cancers of the Esophagus
CHICAGO "“ Gastroesophageal reflux disease (GERD) may be associated with more cases of cancers than previously thought, according to a study in the June issue of Archives of Surgery, one of the JAMA/Archives journals.
The relationship of GERD and adenocarcinoma (type of cancer) of the esophagus is clear for tumors located along the tubular portion of the esophagus, regardless of whether Barrett mucosa (a condition where the cellular lining of the esophagus has been changed, often caused by gastric reflux) is found, according to background information in the article. But there is controversy about the origin of tumors located at the far end of the esophagus where it connects to the stomach. Two distinct cancer types arise there. One type is associated with Barrett mucosa and that it is caused by reflux is widely accepted, the authors write, but the second type has no associated Barrett mucosa and it has been proposed that these tumors originate differently. The major evidence in support of this position has been that the second type of tumor has a worse prognosis.
The researchers found that patients with Barrett mucosa had tumors that were diagnosed earlier; were smaller in size; earlier in stage, with fewer node metastases [spreading cancer]; and had a better five-year survival. "Although overall survival in the two groups was significantly different, survival by tumor stage was similar," the authors write. "This suggests that adenocarcinomas without detectable Barrett epithelium [Barrett mucosa] may not be a different type of tumor but rather a more advanced stage of the same disease. It is likely that these larger more aggressive tumors have overgrown the Barrett epithelium in which they arose." Based on cancer registry data, the authors suggest that this conclusion would double the number of cases of loss of life due to malignancy from gastroesophageal reflux disease.
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