Obesity Behind Esophageal Cancer Rise?
Rates Triple for 1 Form of Cancer of the Esophagus
Jan. 25, 2008 (Orlando) -- There has been a dramatic rise in a common form of one of the deadliest cancers over the past two decades -- and the epidemic of obesity is at least partly to blame, researchers report.
The cancer, a type of esophageal cancer called adenocarcinoma, struck three times more people in 2002 than in 1986, says Timothy L. Fitzgerald, MD, director of surgical oncology at Lacks Cancer Center in Grand Rapids, Mich.
Meanwhile, there was a significant increase in average BMI (body mass index) during the same period, he says. A ratio of weight to height, BMI is commonly used to determine if a person is obese.
"We're seeing this huge increase in esophageal cancer coincidental to the rise in obesity," Fitzgerald tells WebMD.
The findings were reported at the annual Gastrointestinal Cancers Symposium.
2 Types of Esophageal Cancer
This year, more than 15,000 Americans will be diagnosed with cancer of the esophagus, the tube that carries food from the mouth to the stomach. Nearly 14,000 people will die of the disease.
There are two main types of esophageal cancer. One type grows in the cells that form the top layer of the lining of the esophagus. These are called squamous cells, and cancer that starts there is known as squamous cell carcinoma. Smoking and drinking alcohol are two of the biggest risk factors.
Adenocarcinoma mainly affects the lowest portion of the esophagus, where it meets the stomach. Studies have shown that people who are obese, who have acid reflux, or who have Barrett's esophagus, a condition in which abnormal cells develop from long-term acid reflux, are more likely to get this form of esophageal cancer.
Regardless of the type of esophageal cancer, fewer than one in five patients will be alive five years after diagnosis, says William J. Blot, PhD, a cancer epidemiologist at Vanderbilt University School of Medicine in Nashville. Blot was one the first researchers to show that esophageal cancers were on the rise in the U.S.
Adenocarcinomas Take Over
As recently as 1975, three in four esophageal cancers were squamous cell cancers. But starting in 1996, adenocarcinomas took over, Fitzgerald says. Now, esophageal adenocarcinoma rates are rising faster than those of any other cancer, he says.