Risk factors for esophageal cancer
A risk factor is something that increases the risk of developing cancer. It could be a behaviour, substance or condition. Most cancers are the result of many risk factors. But sometimes esophageal cancer develops in people who don’t have any of the risk factors described below.
The most common types of esophageal cancer are adenocarcinoma and squamous cell carcinoma (SCC). Some risk factors are common to both types of esophageal cancer, but other risk factors are linked with only adenocarcinoma or SCC.
Men are more likely to be diagnosed with cancer of the esophagus than women. Most people diagnosed with esophageal cancer are men over the age of 60. The highest rates of SCC of the esophagus occur in parts of China, Iran, South America, France and Africa, and the incidence is decreasing worldwide. In contrast the incidence of adenocarcinoma of the esophagus is increasing, especially in high- and middle-income countries. Low socioeconomic status increases the risk of esophageal cancer, especially SCC.
Barrett’s esophagus is the most common precancerous condition of the esophagus. It isn’t cancer, but it can sometimes become esophageal cancer if it isn’t treated. Some of the risk factors for esophageal cancer may also cause Barrett’s esophagus. Find out more about Barrett’s esophagus.
Risk factors are generally listed in order from most to least important. But in most cases, it is impossible to rank them with absolute certainty.
There is convincing evidence that the following factors increase your risk for esophageal cancer.
Using any kind of tobacco has been linked to the development of esophageal cancer. Tobacco use combined with drinking alcohol increases the risk of developing esophageal cancer more than either risk factor alone.
The risk of developing both squamous cell carcinoma (SCC) and adenocarcinoma of the esophagus increases the longer and the more you smoke.
Smoking causes both SCC and adenocarcinoma of the esophagus, but smokers are more likely to develop SCC. Smokers have a much higher risk of developing SCC of the esophagus than non-smokers. The more you smoke, the greater your risk is of developing SCC of the esophagus.
Researchers have shown that the risk of developing SCC of the esophagus decreases after you stop smoking. For adenocarcinoma of the esophagus, the risk is lower in former smokers than in current smokers, but it is not clear how much a person’s risk decreases after they stop smoking.
Pipes and cigars
People who smoke pipes and cigars have a higher risk of developing SCC of the esophagus.
Researchers have shown that smokeless tobacco increases the risk for both SCC and adenocarcinoma of the esophagus.
Drinking alcohol is a risk factor for SCC of the esophagus. The more alcohol you drink, the greater your risk. It is not known for sure if alcohol is a risk factor for adenocarcinoma of the esophagus.
Drinking alcohol combined with using tobacco increases the risk of esophageal cancer more than either risk factor alone.
Betel quid contains cancer-causing substances that increase the risk of developing SCC of the esophagus. Betel quid and tobacco are often chewed together, but there is a risk of developing SCC of the esophagus whether or not tobacco is also chewed.
Gastroesophageal reflux disease (GERD)
Gastroesophageal reflux disease (GERD) is a disorder in which the contents of the stomach (including stomach acid) back up, or reflux, into the esophagus. This causes heartburn and discomfort in the upper abdomen or chest. The stomach acid can damage the tissue at the lower end of the esophagus.
GERD increases the risk of Barrett’s esophagus, which increases the risk of developing adenocarcinoma of the esophagus.
Having overweight or obesity
People who drink very hot coffee, tea, maté and other beverages (hotter than 65°C) have a higher risk of developing esophageal cancer, particularly squamous cell carcinoma. Hot maté is made by pouring boiling water over leaves of the yerba maté plant and is drunk through a metal straw. Drinking very hot maté is common in South American countries. Drinking very hot tea or coffee is common in China, Japan, Iran and Turkey.
Tylosis is a rare inherited disease that increases the risk of developing esophageal cancer. Researchers have identified the tylosis esophageal cancer (TOC) gene. People with this abnormal gene develop scaly patches (hyperkeratosis) on the palms of the hands or soles of the feet. They also have growths with finger-like projections, called papillomas, in the esophagus.
Achalasia is an uncommon condition in which the nerves that control the normal rhythmic contractions in the esophagus and the lower esophageal sphincter do not work properly. The part of the esophagus above the sphincter becomes enlarged, and a person has a hard time swallowing food and liquid.
Researchers think that achalasia increases the risk for SCC of the esophagus because the food trapped in the esophagus can cause chronic irritation. After symptoms start, it can take many years for cancer to develop.
Plummer-Vinson syndrome is also called Paterson-Kelly syndrome. In this rare syndrome, the mucous membranes of the mouth, throat (pharynx) and esophagus waste away. A thin membrane of tissue (known as an esophageal web) can also grow anywhere along the esophagus, which causes problems swallowing. Doctors think Plummer-Vinson syndrome is caused by a lack of vitamins and iron. People with this syndrome often have iron-deficient anemia.
About 10% of people with Plummer-Vinson syndrome will develop SCC of the esophagus. Researchers think that this syndrome increases the risk for SCC of the esophagus because it causes nutritional problems, and the food trapped in the webs can cause chronic irritation.
The esophagus can be damaged by exposure to chemicals. Drinking a caustic chemical such as lye can lead to narrowed areas called strictures in the esophagus. SCC of the esophagus can occur in these strictures many years after the chemical injury.
People who had cancer that started in the upper airway, such as oral, pharyngeal or laryngeal (voice box) cancer, are at risk for SCC of the esophagus. These cancers have some of the same risk factors as esophageal cancer, such as tobacco and alcohol use.
People who were exposed to ionizing radiation have a higher risk of developing esophageal cancer, mainly SCC of the esophagus. Studies have shown that the risk of developing adenocarcinoma of the esophagus after exposure to ionizing radiation is much lower.
People who were given radiation therapy to treat breast cancer or Hodgkin lymphoma have a higher risk of developing SCC of the esophagus. However, the benefit of treating cancer often greatly outweighs the risk of developing esophageal cancer later in life.
Ankylosing spondylitis is a type of arthritis that affects the spine. People who were given x-ray therapy to treat this disease have a higher risk of developing SCC of the esophagus.
Possible risk factors
The following factors have been linked with esophageal cancer, but there is not enough evidence to show for sure that they are risk factors. More research is needed to clarify the role of these factors for esophageal cancer.
- family history
- human papilloma virus (HPV) infection
- eating processed meat
- a diet low in vegetables and fruit
- physical inactivity
No link to esophageal cancer
Significant evidence shows that there is no link between Helicobacter pylori (H. pylori) infection, and carbonated drinks and a higher risk of esophageal cancer.
Questions to ask your healthcare team
To make the decisions that are right for you, ask your healthcare team questions about risks.
A person’s financial and social position compared to others, including how much money their family makes, their education level and the type of work they do. Socioeconomic status can increase or decrease the risk of some types of cancer.
Extra body fat that may have a harmful effect on health. Overweight increases the risk of gallbladder, kidney, uterine, colorectal, esophageal and other cancers.
A body mass index (BMI) of 25 to 29.9 is generally considered to be overweight.
A condition in which a person has an abnormally high, unhealthy amount of body fat.
Obesity increases the risk of several types of cancer, including breast, uterine, pancreatic, kidney, colorectal and liver.
A type of virus that causes abnormal tissue growth (warts) and other changes to cells.
There are over 100 types of HPV. Most types of HPV cause harmless warts on the hands, fingers, feet and even the face. Some types of HPV cause genital warts, are associated with an increased risk of several different types of cancer, including cancers of the cervix, oropharynx, anus, penis and vulva.
A type of bacteria that causes inflammation and ulcers in the stomach and small intestine.
Infection with H. pylori is associated with an increased risk of developing stomach cancer.
Cancer affects all Canadians
Nearly 1 in 2 Canadians is expected to be diagnosed with cancer in their lifetime.