HealthyCanada.com

The cause of esophageal cancer is unknown. However, smoking cigarettes or using smokeless tobacco is one of the major risk factors for this disease. Drinking excessive amounts of alcohol in combination with smoking raises the risk further. Scientists believe these substances increase each other's harmful effects. Other risk factors include:

Age. Esophageal cancer is more likely to occur as people get older; most people who develop esophageal cancer are over age 60.

Gender. Cancer of the esophagus is more common in men than in women.

Diet. Diets low in fresh fruits and vegetables, especially those deficient in vitamins A, C and riboflavin, also increase risk.

Working environment. Some groups of workers appear to be at increased risk: those exposed to high levels of combustion byproducts, various metals and asbestos; plumbers and pipefitters; and workers in rubber, asphalt and petrochemical industries.

Barrett's Esophagus. Long-term irritation can increase the risk of esophageal cancer. Tissues at the bottom of the esophagus can become irritated if stomach acid frequently "backs up" into the esophagus -- a problem called gastric reflux. Over time, cells in the irritated part of the esophagus may change and begin to resemble the cells that line the stomach. This condition, known as Barrett's esophagus, is a pre-malignant condition that may develop into adenocarcinoma of the esophagus.

Other Types of Irritation. Other causes of significant irritation or damage to the lining of the esophagus, such as swallowing lye or other caustic substances, can increase the risk of developing esophageal cancer.

Medical History. People who have had other head and neck cancers have an increased chance of developing a second cancer in the head and neck area, including esophageal cancer.

Early esophageal cancer usually does not cause symptoms. However, as the cancer grows, symptoms may include:

• difficult or painful swallowing
• severe weight loss
• pain in the throat or back, behind the breastbone or between the shoulder blades
• repeated respiratory infections
• hoarseness or chronic cough
• vomiting
• coughing up blood or bloody mucus

These symptoms may be caused by esophageal cancer or by other conditions. It is important to check with a doctor.

Esophageal cancer is divided into two major types, squamous cell carcinoma and adenocarcinoma, depending on the type of cells that are malignant. Squamous cell carcinomas arise in squamous cells that line the esophagus. These cancers usually occur in the upper and middle part of the esophagus. Adenocarcinomas usually develop in the glandular tissue in the lower part of the esophagus. The treatment is similar for both types of esophageal cancer.

Treatment depends on a number of factors, including the size, location, and extent of the tumour, and the general health of the patient. Many different treatments and combinations of treatments may be used to control the cancer and/or to improve the patient's quality of life by reducing symptoms. These include:

Surgery is the most common treatment for esophageal cancer. Usually, the surgeon removes the tumor along with all or a portion of the esophagus, nearby lymph nodes, and other tissue in the area. (An operation to remove the esophagus is called an esophagectomy.) The surgeon connects the remaining healthy part of the esophagus to the stomach so the patient is still able to swallow. Sometimes, a plastic tube or part of the intestine is used to make the connection. The surgeon may also widen the opening between the stomach and the small intestine to allow stomach contents to pass more easily into the small intestine. Sometimes surgery is done after other treatment is finished.

Radiation therapy, also called radiotherapy, involves the use of high-energy rays to kill cancer cells. Radiation therapy affects cancer cells in the treated area only. The radiation may come from a machine outside the body (external radiation) or from radioactive materials placed in or near the tumor (internal radiation). A plastic tube may be inserted into the esophagus to keep it open during radiation therapy. This procedure is called intraluminal intubation and dilation. Radiation therapy may be used alone or combined with chemotherapy as primary treatment instead of surgery, especially if the size or location of the tumor would make an operation difficult. Doctors may also combine radiation therapy with chemotherapy to shrink the tumor before surgery. Even if the tumor cannot be removed by surgery or destroyed entirely by radiation therapy, radiation therapy can often help relieve pain and make swallowing easier.

Chemotherapy is the use of anticancer drugs to kill cancer cells. The anticancer drugs used to treat esophageal cancer travel throughout the body. Anticancer drugs used to treat esophageal cancer are usually given by injection into a vein (IV). Chemotherapy may be combined with radiation therapy as primary treatment (instead of surgery) or to shrink the tumor before surgery.

Laser therapy is the use of high-intensity light to destroy tumor cells. Laser therapy affects the cells only in the treated area. The doctor may use laser therapy to destroy cancerous tissue and relieve a blockage in the esophagus when the cancer cannot be removed by surgery. The relief of a blockage can help to reduce symptoms, especially swallowing problems.

Photodynamic therapy (PDT), a type of laser therapy, involves the use of drugs that are absorbed by cancer cells; when exposed to a special light, the drugs become active and destroy the cancer cells. The doctor may use PDT to relieve symptoms of esophageal cancer such as difficulty swallowing.

Side Effects of Treatment

The side effects of cancer treatment depend on the type of treatment and may be different for each person. Doctors and nurses can explain the possible side effects of treatment, and they can suggest ways to help relieve symptoms that may occur during and after treatment.

Surgery for esophageal cancer may cause short-term pain and tenderness in the area of the operation, but this discomfort or pain can be controlled with medicine. Patients are taught special breathing and coughing exercises to keep their lungs clear.

Radiation therapy affects normal as well as cancerous cells. Side effects of radiation therapy depend mainly on the dose and the part of the body that is treated. Common side effects of radiation therapy to the esophagus are a dry, sore mouth and throat; difficulty swallowing; swelling of the mouth and gums; dental cavities; fatigue; skin changes at the site of treatment; and loss of appetite.

Chemotherapy, like radiation therapy, affects normal as well as cancerous cells. Side effects depend largely on the specific drugs and the dose (amount of drug administered). Common side effects of chemotherapy include nausea and vomiting, poor appetite, hair loss, skin rash and itching, mouth and lip sores, diarrhea, and fatigue. These side effects generally go away gradually during the recovery periods between treatments or after the treatment is over.

Laser therapy can cause short-term pain where the treatment was given, but this discomfort can be controlled with medicine.

Photodynamic therapy makes the skin and eyes highly sensitive to light for 6 weeks or more after treatment. Other temporary side effects of PDT may include coughing, trouble swallowing, abdominal pain, and painful breathing or shortness of breath.