pancreas cancer : Screening and diagnosis

Detecting pancreatic cancer in its early stages is difficult. Signs and symptoms usually don't appear until the cancer is large or has spread (metastasized) to other tissues. And because your pancreas is relatively hidden — tucked behind your stomach and inside a loop of your small intestine — small tumors can't be seen or felt during routine exams.

For this reason, and because pancreatic cancer spreads so quickly, researchers have focused on finding a reliable screening test. At one time, scientists thought a substance called CA 19-9 was the answer. CA 19-9 is produced by pancreatic cancer cells and can be detected by a blood test. But by the time blood levels are high enough to be measured, the cancer is no longer in its early stages. Currently there is no effective screening test for pancreatic cancer.

If your doctor suspects pancreatic cancer, you may have one or more of the following tests to diagnose the cancer:

Ultrasound imaging. In this test, a device called a transducer is placed on your upper abdomen. High-frequency sound waves from the transducer reflect off your abdominal tissues and are translated by a computer into moving images of your internal organs, including your pancreas. Ultrasound tests are safe, noninvasive and relatively brief — a typical test takes less than an hour.
Computerized tomography (CT) scan. This imaging test allows your doctor to visualize your organs, including your pancreas, in two-dimensional slices. Split-second computer processing creates these images as a series of very thin X-ray beams pass through your body. Sometimes you may have a dye (contrast medium) injected into a vein before the test. The clearer images produced with the dye make it easier to distinguish a tumor from normal tissue. A CT scan exposes you to more radiation than do conventional X-rays, but in most cases, the benefits of the test outweigh the risks.
Magnetic resonance imaging (MRI). Instead of X-rays, this test uses a powerful magnetic field and radio waves to create images of your pancreas. During the test, you're placed in a cylindrical tube that can seem confining to some people. The machine also makes a loud thumping noise you might find disturbing. In most cases you'll be given headphones for the noise.
Endoscopic retrograde cholangiopancreatiography (ERCP). In this procedure, a thin, flexible tube (endoscope) is gently passed down your throat, through your stomach and into the upper part of your small intestine. Air is used to inflate your intestinal tract so your doctor can more easily see the openings of your pancreatic and bile ducts. The bile ducts are thin tubes that carry bile, a fluid produced in your liver that helps digest fats. These ducts are often the site of pancreatic tumors. A dye is then injected into the ducts through a small hollow tube (catheter) that's passed through the endoscope. Finally, X-rays are taken of the ducts. Your throat may be sore for a time after the procedure, and you may feel bloated from the air introduced into your intestine.
Endoscopic ultrasound (EUS). In this test, an ultrasound device is passed through an endoscope into your stomach. The device directs sound waves to your pancreas. A computer then translates the sound waves into close-up images of your pancreas and your bile and pancreatic ducts. The images are superior to those produced by standard ultrasound and are particularly useful for detecting small pancreatic tumors.
Percutaneous transhepatic cholangiography (PTC). In this test, your doctor carefully inserts a thin needle into your liver while you lie on a movable X-ray table. A dye is then injected into the bile ducts in your liver, and a special X-ray machine (fluoroscope) tracks the dye as it moves through the ducts. Any obstructions should show up on the X-ray. The table is rotated several times during the procedure so you can assume a variety of positions. During the test, you may have a feeling of pressure or fullness, or have slight discomfort in the right side of your back.
Biopsy. In this procedure, a small sample of tissue is removed and examined for malignant cells under a microscope. It's the only way to make a definitive diagnosis of cancer. Biopsies of the pancreas and bile ducts can be performed in several ways. If you have a mass that can be reached with a needle, your doctor may choose to perform a fine-needle aspiration (FNA) — a procedure in which a very thin needle is inserted through your skin and into your pancreas. An ultrasound or CT scan is often used to guide the needle's placement. When the needle has reached the tumor, cells are withdrawn and sent to a lab for further study. Tissue samples can also be removed during ERCP or EUS. Sometimes, in a procedure similar to ERCP, your surgeon uses an endoscope to pass a catheter into your bile duct where it empties into your small intestine. But instead of injecting dye, your surgeon uses a small brush introduced through the catheter to scrape cells and bits of tissue from the lining of the duct.
Laparoscopy. This procedure uses a small, lighted instrument (laparoscope) to view your pancreas and surrounding tissue. The instrument is attached to a television camera and inserted through a small incision in your abdomen. The camera allows your surgeon to clearly see what's happening inside you. During laparoscopy, your surgeon can take tissue samples to help confirm a diagnosis of cancer. Laparoscopy may also be used to determine how far cancer has spread. Risks include bleeding and infection and a slight chance of injury to your abdominal organs or blood vessels.
Staging pancreatic cancer
Staging tests help determine the size and location of cancer and whether it has spread. They're crucial in helping your doctor determine the best treatment for you. Pancreatic cancer may be staged in several ways. One method is to use these terms:

Resectable. All the tumor nodules can be removed.
Locally advanced. Because the cancer has spread to tissues around the pancreas or into the blood vessels, it can no longer be completely removed.
Metastatic. At this stage, the cancer has spread to distant organs, such as the lungs and liver.
Your doctor may also refer to your cancer as stage 1, 2, 3, or 4:

Stage 1 pancreatic cancer is confined to the pancreas.
Stage 2 pancreatic cancer has spread somewhat, possibly to the lymph nodes, but not into large blood vessels nearby.
Stage 3 pancreatic cancer has invaded large blood vessels, may be in the lymph nodes, but hasn't spread to distant sites.
Stage 4 means the cancer has spread to a distant site or sites in your body

This center sponsored by: Chemotherapy.com