Tests for pancreatic cancer
If a person has signs and symptoms that might be caused by pancreatic cancer, certain exams and tests will be done to find the cause. If cancer is found, further tests will be done to help determine the extent (stage) of the cancer.
Medical history and physical exam
Your doctor will ask about your medical history to learn more about your symptoms. The doctor might also ask about possible risk factors, including your family history.
Your doctor will also examine you to look for signs of pancreatic cancer or other health problems. The exam will probably focus mostly on your belly. Pancreatic cancers can sometimes cause the liver or gallbladder to swell, which the doctor might be able to feel during the exam. Your skin and the whites of your eyes will also be checked for jaundice (yellowing).
If the results of the exam are abnormal, your doctor will probably order tests to help find the problem. You might also be referred to a gastroenterologist (a doctor who treats digestive system diseases) for further tests and treatment.
Imaging tests use x-rays, magnetic fields, sound waves, or radioactive substances to create pictures of the inside of your body. Imaging tests might be done for a number of reasons both before and after a diagnosis of pancreatic cancer, including:
- To look for suspicious areas that might be cancer
- To learn if and how far cancer has spread
- To help determine if treatment is working
- To look for signs of cancer coming back after treatment
Computed tomography (CT) scan
The CT scan makes detailed cross-sectional images of your body. CT scans are often used to diagnose pancreatic cancer because they can show the pancreas fairly clearly. They can also help show if cancer has spread to organs near the pancreas, as well as to lymph nodes and distant organs. A CT scan can help determine if surgery might be a good treatment option.
If your doctor thinks you might have pancreatic cancer, you might get a special type of CT known as a multiphase CT scan or a pancreatic protocol CT scan. During this test, different sets of CT scans are taken over several minutes after you get an injection of an intravenous (IV) contrast.
CT-guided needle biopsy: CT scans can also be used to guide a biopsy needle into a suspected pancreatic tumor. But if a needle biopsy is needed, most doctors prefer to use endoscopic ultrasound (described below) to guide the needle into place.
Magnetic resonance imaging (MRI)
MRI scans use radio waves and strong magnets instead of x-rays to create detailed images of parts of your body. Most doctors prefer to look at the pancreas with CT scans, but an MRI might also be done.
Special types of MRI scans can also be used in people who might have pancreatic cancer:
- MR cholangiopancreatography (MRCP), which can be used to look at the pancreatic and bile ducts, is described below in the section on cholangiopancreatography.
- MR angiography (MRA), which looks at blood vessels, is mentioned below in the section on angiography.
Ultrasound tests use sound waves to create images of organs such as the pancreas.
Abdominal ultrasound: For this test, a wand-shaped probe is moved over the skin of the abdomen. It gives off sound waves and detects the echoes as they bounce off organs. If it’s not clear what might be causing a person’s abdominal symptoms, this might be the first test done because it is easy to do and it doesn’t expose a person to radiation. But if signs and symptoms are more likely to be caused by pancreatic cancer, a CT scan is often more useful.
Endoscopic ultrasound (EUS): This test is more accurate than abdominal ultrasound and can be very helpful in diagnosing pancreatic cancer. This test is done with a small ultrasound probe on the tip of an endoscope, which is a thin, flexible tube that doctors use to look inside the digestive tract.
For this test, you will first be sedated (given medicine to make you sleepy). The scope is then passed through your mouth or nose, down through the stomach, and into the first part of the small intestine. It is then pointed toward the pancreas, which is next to the small intestine. The probe on the tip of the endoscope can get very close to the pancreas, so this is a very good way to look at the pancreas. If a tumor is seen, a small, hollow needle can be passed down the endoscope to get biopsy samples of it.
This is an imaging test that looks at the pancreatic ducts and bile ducts to see if they are blocked, narrowed, or dilated. These tests can help show if someone might have a pancreatic tumor that is blocking a duct. They can also be used to help plan surgery. The test can be done in different ways, each of which has pros and cons.
Endoscopic retrograde cholangiopancreatography (ERCP): For this test, an endoscope (a thin, flexible tube with a tiny video camera on the end) is passed down the throat, through the esophagus and stomach, and into the first part of the small intestine. This is usually done while you are sedated (given medicine to make you sleepy).
The doctor can see through the endoscope to find the ampulla of Vater (where the common bile duct empties into the small intestine). The doctor guides a catheter (a very small tube) through the tip of the endoscope and into the common bile duct. A small amount of dye (contrast material) is then injected into the common bile duct, and x-rays are taken. This dye outlines the bile and pancreatic ducts. The x-rays can show narrowing or blockage in these ducts that might be due to pancreatic cancer. The doctor doing this test can also put a small brush through the tube to remove cells for a biopsy (see below).
ERCP can also be used to place a stent (small tube) into a bile or pancreatic duct to keep it open if a nearby tumor is pressing on it. This is described in more detail in the section on palliative surgery in Surgery for pancreatic cancer.
Magnetic resonance cholangiopancreatography (MRCP): This is a non-invasive way to look at the pancreatic and bile ducts using the same type of machine used for standard MRI scans. Unlike ERCP, it does not require an infusion of a contrast dye. Because this test is non-invasive, doctors often use MRCP if the purpose is just to look at the pancreatic and bile ducts. But this test can’t be used to get biopsy samples of tumors or to place stents in ducts.
Percutaneous transhepatic cholangiography (PTC): In this procedure, the doctor puts a thin, hollow needle through the skin of the belly and into a bile duct within the liver. A contrast dye is then injected through the needle, and x-rays are taken as it passes through the bile and pancreatic ducts. As with ERCP, this approach can also be used to take fluid or tissue samples or to place a stent into a duct to help keep it open. Because it is more invasive (and might cause more pain), PTC is not usually used unless ERCP has already been tried or can’t be done for some reason.
Somatostatin receptor scintigraphy (SRS)
This test, also known as OctreoScan, can be very helpful in finding pancreatic neuroendocrine tumors (NETs). A hormone-like substance called octreotide that is bound to a radioactive substance is injected into a vein. Octreotide travels through the blood and attaches to the tumor cells of many types of NETs (although it is less helpful for insulinomas).
Several hours after the injection, a special camera can be used to show where the radioactivity is in the body. More scans may be done on the following few days as well.
This scan can also help decide on treatment. NETs that show up on SRS scans will often stop growing if treated with octreotide.
Positron emission tomography (PET) scan
For a PET scan, you are injected with a slightly radioactive form of sugar, which collects mainly in cancer cells. A special camera is then used to create a picture of areas of radioactivity in the body.
This test is sometimes used to look for spread from exocrine pancreatic cancers, but because NETs grow slowly, they do not show up well on PET scans.
PET/CT scan: Special machines can do both a PET and CT scan at the same time. This lets the doctor compare areas of higher radioactivity on the PET scan with the more detailed appearance of that area on the CT scan. This test can help determine the stage (extent) of the cancer. It might be especially useful for spotting cancer that has spread beyond the pancreas and wouldn’t be treatable by surgery.
This is an x-ray test that looks at blood vessels. A small amount of contrast dye is injected into an artery to outline the blood vessels, and then x-rays are taken.
An angiogram can show if blood flow in a particular area is blocked or compressed by a tumor. It can also show abnormal blood vessels (feeding the cancer) in the area. This test can be useful in finding out if a pancreatic cancer has grown through the walls of certain blood vessels. Mainly, it helps surgeons decide if the cancer can be removed completely without damaging vital blood vessels, and it can also help them plan the operation.
Angiography can also be used to look for pancreatic NETs that are too small to be seen on other imaging tests. These tumors cause the body to make more blood vessels to “feed” the tumor, which can often be seen on angiography.
X-ray angiography can be uncomfortable because the doctor has to put a small catheter into the artery leading to the pancreas. Usually the catheter is put into an artery in your inner thigh and threaded up to the pancreas. A local anesthetic is often used to numb the area before inserting the catheter. Once the catheter is in place, the dye is injected to outline all the vessels while the x-rays are being taken.
Angiography can also be done with a CT scanner (CT angiography) or an MRI scanner (MR angiography). These techniques are now used more often because they can give the same information without the need for a catheter in the artery. You might still need an IV line so that a contrast dye can be injected into the bloodstream during the imaging.
Several types of blood tests can be used to help diagnose pancreatic cancer or to help determine treatment options if it is found.
Blood tests for exocrine pancreatic cancers
Liver function tests: Jaundice (yellowing of the skin and eyes) is often one of the first signs of pancreatic cancer, but it can have many causes other than cancer. Doctors often get blood tests to assess liver function in people with jaundice to help determine its cause.
For example, blood tests that look at levels of different kinds of bilirubin (a chemical made by the liver) can help tell whether a patient’s jaundice is caused by disease in the liver itself or by a blockage of bile flow (from a gallstone, a tumor, or other disease).
Tumor markers: Tumor markers are substances that can sometimes be found in the blood when a person has cancer. Two tumor markers may be helpful in pancreatic cancer:
- CA 19-9
- Carcinoembryonic antigen (CEA), which is not used as often as CA 19-9
Neither of these tumor marker tests is accurate enough to tell for sure if someone has pancreatic cancer. Levels of these tumor markers are not high in all people with pancreatic cancer, and some people who don’t have pancreatic cancer might have high levels of these markers for other reasons. Still, these tests can sometimes be helpful, along with other tests, in figuring out if someone has cancer.
In people already known to have pancreatic cancer and who have high CA19-9 or CEA levels, these levels can be measured over time to help tell how well treatment is working. If all of the cancer has been removed, these tests can also be done to look for the cancer coming back.
Other blood tests: Other tests can help evaluate a person’s general health (such as kidney and bone marrow function). These tests can help determine if they’ll be able to withstand the stress of a major operation.
Blood tests for pancreatic neuroendocrine tumors
Blood tests looking at the levels of certain pancreatic hormones can often help diagnose pancreatic neuroendocrine tumors (NETs). Tests might be done to check blood levels of:
- Hormones made by different types of NET cells, such as insulin, gastrin, glucagon, somatostatin, pancreatic polypeptide, and VIP (vasoactive intestinal peptide)
- Chromogranin A (CgA)
- Glucose and C-peptide (for insulinomas)
Carcinoid tumors: For carcinoids, a blood test may be done to look for serotonin, which is made by many of these tumors. The urine might also be tested for serotonin and for related chemicals such as 5-HIAA and 5-HTP.
Other common tests to look for carcinoids include blood tests for chromogranin A (CgA), neuron-specific enolase (NSE), substance P, and gastrin.
Depending on where the tumor might be located and the patient’s symptoms, doctors might do other blood tests as well.
A person’s medical history, physical exam, and imaging test results may strongly suggest pancreatic cancer, but usually the only way to be sure is to remove a small sample of tumor and look at it under the microscope. This procedure is called a biopsy. Biopsies can be done in different ways.
Percutaneous (through the skin) biopsy: For this test, a doctor inserts a thin, hollow needle through the skin over the abdomen and into the pancreas to remove a small piece of a tumor. This is known as a fine needle aspiration (FNA). The doctor guides the needle into place using images from ultrasound or CT scans.
Endoscopic biopsy: Doctors can also biopsy a tumor during an endoscopy. The doctor passes an endoscope (a thin, flexible, tube with a small video camera on the end) down the throat and into the small intestine near the pancreas. At this point, the doctor can either use endoscopic ultrasound (EUS) to pass a needle into the tumor or endoscopic retrograde cholangiopancreatography (ERCP) to remove cells from the bile or pancreatic ducts. These tests are described in more detail above. You will be sedated (made sleepy) for these tests, but general anesthesia (being put into a deep sleep) is not usually needed. Major side effects from these types of biopsies are rare.
Surgical biopsy: Surgical biopsies are now done less often than in the past. They can be useful if the surgeon is concerned the cancer has spread beyond the pancreas and wants to look at (and possibly biopsy) other organs in the abdomen.
The most common way to do a surgical biopsy is to use laparoscopy (sometimes called keyhole surgery). You will be sedated or asleep for this procedure. The surgeon makes several small incisions (cuts) in the abdomen and inserts long, thin instruments. One of these has a small video camera on the end to let the surgeon see inside the abdomen. The surgeon can look at the pancreas and other organs for tumors and take biopsy samples of abnormal areas.
In the past, surgeons often used a laparotomy (a large incision through the skin into the wall of the abdomen) to examine internal organs and take biopsies. But this type of surgery requires a longer recovery and is now rarely used.
Some people might not need a biopsy
Rarely, the doctor might not do a biopsy on someone who has a tumor in the pancreas if imaging tests show the tumor is very likely to be cancer and if it looks like surgery can remove all of it. Instead, the doctor will proceed with surgery, at which time the tumor cells can be looked at to confirm the diagnosis. During surgery, if the doctor finds that the cancer has spread too far to be removed completely, only a sample of the cancer may be removed to confirm the diagnosis, and the rest of the planned operation will be stopped.
See Testing Biopsy and Cytology Specimens for Cancer to learn more about different types of biopsies, how the biopsy samples are tested in the lab, and what the results will tell you.
Last Medical Review: 03/14/2016
Last Revised: 04/05/2016