What is stomach cancer?
Stomach cancer, also known as gastric cancer, is cancer that starts in any part of the stomach. The stomach is just one of many organs located in the abdomen, the area of the body between the chest and the pelvis. Among other organs found in the abdomen are the liver, pancreas, gallbladder, and colon. It is important to differentiate among these organs, because cancers and other diseases that affect them present different symptoms and are treated differently.
The American Cancer Society estimates that 21,130 Americans will be newly diagnosed with stomach cancer during 2009, and 10,620 deaths are expected.
What causes stomach cancer?
The exact cause of stomach cancer is not known, although there are many risk factors believed to contribute to cells in the stomach becoming cancerous.
What are the risk factors for stomach cancer?
The following are suggested as risk factors for stomach cancer:
- Helicobacter pylori infection
- diet that includes the following:
- large amounts of smoked foods
- salted fish and meat
- foods high in starch and low in fiber
- pickled vegetables
- foods and beverages that contain nitrates and nitrites
- tobacco use
- alcohol abuse
- previous stomach surgery
- megaloblastic (pernicious) anemia (caused by vitamin B12 deficiency)
- Menetrier's disease
- age (marked increase after age 50 and most patients are in their 60s, 70s, or 80s)
- male gender (more men are diagnosed with the disease than women)
- having blood type A
- family history of the following:
- nonpolyposis colon cancer
- familial adenomatous polyposis
- stomach cancer
- history of stomach polyps
- exposure to environmental factors such as dusts and fumes in the workplace
- race (more common in Asians, Pacific Islanders, Hispanics, and African Americans than in non-Hispanic Caucasian Americans)
What are the symptoms of stomach cancer?
The following are the most common symptoms of stomach cancer. However, each individual may experience symptoms differently. Symptoms may include:
- indigestion or heartburn (burning sensation)
- discomfort or pain in the abdomen
- nausea and vomiting
- diarrhea or constipation
- bloating after meals
- loss of appetite
- unexplained weight loss
- weakness and fatigue
- vomiting blood or blood in the stool
The symptoms of stomach cancer may resemble other medical conditions or problems. Always consult your physician for a diagnosis.
How is stomach cancer diagnosed?
In addition to a complete medical history and physical examination, diagnostic procedures for stomach cancer may include the following:
- fecal occult blood test - checks for hidden (occult) blood in the stool. It involves placing a very small amount of stool on a special card, which is then tested in the physician's office or sent to a laboratory.
- upper GI (gastrointestinal) series (Also called barium swallow.) - a diagnostic test that examines the organs of the upper part of the digestive system: the esophagus, stomach, and duodenum (the first section of the small intestine). A fluid called barium (a metallic, chemical, chalky, liquid used to coat the inside of organs so that they will show up on an x-ray) is swallowed. X-rays are then taken to evaluate the digestive organs.
- esophagogastroduodenoscopy (Also called EGD or upper endoscopy.) - An EGD (upper endoscopy) is a procedure that allows the physician to examine the inside of the esophagus, stomach, and duodenum. A thin, flexible, lighted tube, called an endoscope, is guided into the mouth and throat, then into the esophagus, stomach, and duodenum. The endoscope allows the physician to view the inside of this area of the body, as well as to insert instruments through a scope for the removal of a sample of tissue for biopsy (if necessary).
- endoscopic ultrasound - this imaging technique uses sound waves to create a computer image of the inside of the esophagus and stomach. The endoscope is guided into the mouth and throat, then into the esophagus and the stomach. As in standard endoscopy, this allows the physician to view the inside of this area of the body, as well as insert instruments to remove a sample of tissue (biopsy).
Treatment for stomach cancer:
Specific treatment for stomach cancer will be determined by your physician based on:
- your age, overall health, and medical history
- extent of the disease
- your tolerance for specific medications, procedures, or therapies
- expectations for the course of the disease
- your opinion or preference
Treatment for stomach cancer may include:
Surgery may be necessary to remove cancerous tissue, as well as nearby noncancerous tissue. The most common operation is called gastrectomy. If part of the stomach is removed, it is called a subtotal or partial gastrectomy. If the entire stomach is removed, it is called a total gastrectomy.
- external radiation (external beam therapy)
External radiation precisely sends high levels of radiation directly to the cancer cells. The machine is controlled by the radiation therapist. Since radiation is used to kill cancer cells and to shrink tumors, special shields may be used to protect the tissue surrounding the treatment area. Radiation treatments are painless and usually last a few minutes. External radiation may be used to ease (palliate) symptoms such as pain or blockage.
Chemotherapy is the use of anticancer drugs to treat cancerous cells. In most cases, chemotherapy works by interfering with the cancer cell’s ability to grow or reproduce. Different groups of drugs work in different ways to fight cancer cells. The oncologist will recommend a treatment plan for each individual.
Sometimes, several of these treatments may be combined to treat stomach cancer.
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Online Resources of Digestive Disorders