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Diagnosing stomach cancer

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A thorough and accurate cancer diagnosis is the first step in developing a stomach cancer treatment plan. Your team of stomach cancer experts will use a variety of tools and tests designed for diagnosing stomach cancer, evaluating the disease and developing your individualized treatment plan. Throughout your treatment, we"ll use laboratory tests and imaging tools to monitor your response to treatment and modify your plan when needed.

Procedures designed for diagnosing stomach cancer include:

Endoscopic procedures

These minimally invasive, outpatient endoscopic procedures allow a doctor to see inside the stomach. They include:

  • Esophagogastroduodenoscopy (EGD), also known as an upper endoscopy, is the primary test for diagnosing stomach cancer. To undergo an EGD procedure, you first receive a sedative. A gastroenterologist then inserts an endoscope (a thin, lighted tube) into your mouth. He or she passes the endoscope through your throat, down into your esophagus and stomach, and into the first part of your small intestine. The endoscope enables your gastroenterologist to see inside these organs to check for abnormalities, such as tumors, ulcers, obstructions and inflammation. He or she obtains biopsies of abnormal tissue through the endoscope. The tissue is then analyzed in the laboratory to look for signs of cancer. An EGD procedure takes approximately 15 minutes.
  • Endoscopic ultrasound (EUS) helps your gastroenterologist examine your stomach and organs, such as your pancreas, liver, gallbladder and bile duct. This test for stomach cancer uses sound waves to identify tumors and nearby lymph nodes to which the cancer may have spread. EUS allows your gastroenterologist to determine whether cancer has spread through multiple layers of your stomach, helping your doctors stage the disease and tailor your treatment plan.

This important diagnostic procedure may be required to determine whether cancer cells are in the stomach. In a biopsy, a small sample of cells are taken from a tumor and analyzed by a pathologist to determine if the cells are cancerous.

Lab tests

Lab tests may be used to help diagnose stomach cancer. They include:

  • Advance genomic testing examines a tumor’s DNA to look for mutations or alterations that may be driving the growth of cancer. By identifying the mutations that occur in a cancer cell"s genome, doctors may better understand what caused the tumor and tailor treatment based on these findings.
  • Complete blood count (CBC) tests determine the numbers of the different types of cells in the blood. A CBC may help determine whether a patient has too few red blood cells, which causes anemia.
  • Liver function tests may be performed to assess the function of your liver, to which stomach cancer can spread.
  • Nutrition panel helps evaluate patients for deficiency of nutrients, such as vitamin D and iron. The test helps us identify the nutrients patients need replaced or boosted to support their quality of life.
Imaging tests

Imaging tests may be used to help diagnose and stage stomach cancer. They include:

  • CT scans are taken to reveal detailed images of your abdomen. These tests help our doctors determine where the cancer is in the stomach and whether it has spread to other abdominal organs.
  • MRI may help doctors stage stomach cancer. MRIs use strong magnetic fields and radio waves to produce detailed images. These tests also allow for greater soft tissue contrast than a CT scan.
  • PET/CT scans help doctors determine the stage of the disease and whether it has spread.
  • Ultrasound may be used if fluid is found in your abdomen. Ultrasound produces images of organs from high-energy sound waves and echoes. It may also be used to check for tumors that have spread to other organs.
  • Upper gastrointestinal series is a series of highlighted X-rays of the stomach, esophagus and the upper portion of the small intestine. This procedure may require the patient to swallow barium that enhances the X-ray images. If your doctor finds abnormal cells during this procedure, the next step may be an endoscopic procedure or another diagnostic imaging test.

Learn more about the stages of stomach cancer

Next topic: How is stomach cancer treated?

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