Pancreatic neuroendocrine tumour – Diagnostics – Overview of Information and Clinical Research

Diagnosing pancreatic neuroendocrine tumors requires a combination of blood tests, imaging scans, and sometimes tissue samples. Because these tumors can cause a wide range of symptoms—or none at all—finding them often starts with noticing unusual changes in your body, such as unexplained weight loss, digestive trouble, or swings in blood sugar. Understanding how doctors identify these rare tumors can help you feel more prepared and informed if you or someone you care about needs testing.

Introduction: Who Should Undergo Diagnostics and When

Not every pancreatic neuroendocrine tumor causes noticeable problems right away. Some people discover they have one during a scan performed for an entirely different reason. However, if you begin to experience persistent symptoms that don’t seem to have an obvious cause, it’s time to speak with a healthcare provider. Common warning signs include severe heartburn that doesn’t respond to usual treatments, ongoing diarrhea, unusual fatigue that lingers for weeks, unexplained weight loss, or episodes of dizziness and confusion that might signal blood sugar swings.^[1]^[2]

People who have a family history of certain inherited conditions, such as multiple endocrine neoplasia type 1 (a genetic syndrome that increases the risk of hormone-producing tumors), should be especially alert. About 5% to 10% of people with some types of pancreatic neuroendocrine tumors also have this inherited condition.^[2]^[3] If anyone in your biological family has had similar tumors or related syndromes, your doctor may recommend earlier or more frequent testing.

It’s also important to seek medical advice if you develop symptoms that might point to hormone overproduction. For example, if you experience frequent stomach ulcers along with severe diarrhea, or if you have episodes where your blood sugar drops dangerously low and you feel shaky or sweaty, these could be signs of a functional tumor—one that releases abnormal amounts of hormones into your bloodstream.^[3]^[8] The earlier these tumors are found, the more options you may have for treatment.

⚠️ Important

Many pancreatic neuroendocrine tumors don’t cause symptoms at first. If you notice ongoing digestive issues, unexplained weight changes, or unusual energy levels, don’t wait too long to see a doctor. Early diagnosis can make a significant difference in your treatment options and overall outlook.

Diagnostic Methods: How Doctors Identify Pancreatic Neuroendocrine Tumors

When you visit your doctor with concerns, the first step is usually a physical examination and a discussion about your symptoms. Your healthcare provider will ask detailed questions: When did your symptoms start? Have they gotten worse? Does anyone in your family have a history of hormone-related tumors or inherited conditions?^[2]^[8] These conversations help your doctor understand whether further testing is necessary.

Blood and Urine Tests

Blood tests are often the next step. Doctors look for elevated levels of specific hormones, which can indicate that a tumor is producing too much of a particular substance. For instance, high levels of insulin might suggest an insulinoma, while elevated gastrin could point to a gastrinoma.^[2]^[8] Blood tests can also reveal indirect signs of a problem, such as low blood sugar or anemia, which might prompt further investigation.

Urine tests may be used to detect breakdown products of hormones. When your body processes certain hormones, it leaves behind traces that can be measured in urine. This type of test helps doctors confirm whether a tumor is actively releasing hormones into your system.^[8]

Imaging Tests

Once blood or urine tests suggest a possible tumor, imaging tests help doctors see where it is, how large it is, and whether it has spread. Computed tomography (CT) scans are commonly used to create detailed cross-sectional images of the pancreas and surrounding organs. A CT scan can reveal the location of a tumor and show if it has reached the liver or other nearby structures.^[2]^[8]

Magnetic resonance imaging (MRI) is another powerful tool. It uses magnets and radio waves to produce highly detailed pictures of soft tissues. MRI scans are particularly useful for examining the pancreas and detecting tumors that might not be visible on other types of scans.^[2]^[8]

A specialized type of scan called a neuroendocrine positron emission tomography (PET) scan is designed specifically for neuroendocrine tumors. In this test, a small amount of radioactive material is injected into your body. The material attaches itself to neuroendocrine tumor cells, making them light up clearly on the scan. This helps doctors see even small tumors that might otherwise be hard to find.^[2]^[8]

Nuclear medicine tests may also be used. These involve injecting a radioactive tracer that sticks to pancreatic neuroendocrine tumors, causing them to show up brightly on images. This type of scan is often combined with a PET or CT scan to provide a more complete picture.^[8]

Endoscopic Procedures

To get an even closer look at your pancreas, doctors may use a procedure called endoscopic ultrasound (EUS). During this test, a thin, flexible tube with a camera and ultrasound device on the tip is gently passed down your throat, into your stomach, and toward the pancreas. The ultrasound creates detailed images from inside your body, allowing doctors to see the size and location of any tumors. If needed, doctors can also pass small tools through the tube to collect a sample of tissue for further testing.^[2]^[8]

Another procedure, called endoscopic retrograde cholangiopancreatography (ERCP), may be performed if doctors need to examine the ducts inside and around the pancreas. This test combines endoscopy with X-rays to create detailed images of the bile and pancreatic ducts.^[2]

Tissue Biopsy

Sometimes, the only way to confirm a diagnosis is to examine a small piece of tumor tissue under a microscope. This is called a biopsy. Doctors may collect tissue during an endoscopic ultrasound or through a separate procedure. The tissue sample is sent to a lab, where specialists analyze it to determine whether the cells are cancerous, what type of neuroendocrine tumor is present, and how quickly the cells are growing.^[8]

Understanding the tumor’s characteristics helps doctors classify it as functional or nonfunctional. Functional tumors produce excess hormones, leading to specific symptoms depending on which hormone is overproduced. Nonfunctional tumors don’t release abnormal amounts of hormones, but they can still cause problems as they grow and spread.^[3]^[8]

Genetic Testing

In some cases, doctors may recommend genetic testing, especially if there’s a family history of inherited conditions linked to neuroendocrine tumors. Blood samples can be analyzed to look for DNA changes that signal an increased risk of developing these tumors. Identifying genetic mutations can help guide treatment decisions and inform family members who might also be at risk.^[8]

Diagnostics for Clinical Trial Qualification

Clinical trials are research studies that test new treatments or combinations of treatments to see if they are safe and effective. If you are considering joining a clinical trial for a pancreatic neuroendocrine tumor, you’ll need to undergo specific tests to determine whether you meet the trial’s requirements. These tests help researchers ensure that participants have the right type and stage of tumor for the study.

Standard qualification tests typically include detailed imaging scans, such as CT, MRI, or PET scans, to confirm the tumor’s location, size, and whether it has spread to other parts of the body. Blood tests are used to measure hormone levels and assess overall health, including liver and kidney function. Tissue biopsies may be required to verify the tumor’s type and grade, which indicates how quickly the cells are dividing and growing.^[8]^[9]

Some clinical trials focus on tumors that produce specific hormones or have certain genetic markers. In these cases, additional blood tests or genetic testing may be needed to confirm that your tumor matches the trial’s criteria. Researchers might also ask for a recent biopsy sample to analyze the tumor’s molecular characteristics in greater detail.

Your healthcare team will work closely with the trial coordinators to ensure that all necessary tests are completed. These tests not only help determine your eligibility but also provide a baseline measurement of your tumor and overall health. This baseline is important because it allows researchers to track how well the treatment works over time.^[9]

⚠️ Important

Clinical trials often have strict eligibility criteria based on the tumor’s characteristics and your overall health. Don’t be discouraged if you don’t qualify for one trial—there may be others that are a better fit. Always discuss your options with your medical team to find the best path forward.

It’s also important to know that participating in a clinical trial means you’ll likely undergo more frequent testing than you would with standard treatment. This is because researchers need to monitor your response to the new treatment closely. While this can feel overwhelming, it also means you’ll receive very close medical attention throughout the study.

Before agreeing to join a clinical trial, make sure you understand what tests will be required, how often they’ll be performed, and what the potential risks and benefits are. Your doctor and the trial coordinators should provide clear, detailed information to help you make an informed decision.^[9]

Prognosis and Survival Rate

Prognosis

The outlook for people with pancreatic neuroendocrine tumors varies widely depending on several factors. These include the tumor’s type, size, location, whether it produces hormones, and whether it has spread to other organs. Tumors that are found early and are still localized—meaning they haven’t spread beyond the pancreas—often have a much better prognosis than those that have metastasized to the liver, bones, or lungs.^[2]^[3]

The behavior of individual pancreatic neuroendocrine tumors can be unpredictable. Most of these tumors grow slowly, which is why they are sometimes discovered by chance during scans for other health issues. However, some can be more aggressive. Doctors use several factors to estimate prognosis, including the tumor’s grade (how quickly the cells are dividing), whether lymph nodes are involved, and whether there is evidence of liver metastasis. Higher tumor grades and the presence of metastases generally indicate a less favorable prognosis.^[7]^[9]

For many patients, even those with advanced disease, pancreatic neuroendocrine tumors can be controlled for years with appropriate treatment. The goal of therapy in these cases is often to slow tumor growth, reduce symptoms, and maintain quality of life rather than to cure the disease outright.^[9]

Survival Rate

Survival rates for pancreatic neuroendocrine tumors are generally much better than those for the more common type of pancreatic cancer (adenocarcinoma). For tumors that are localized and have not spread, the five-year survival rate can be as high as 95%.^[21] This means that 95 out of 100 people with localized tumors are still alive five years after diagnosis.

When the tumor has spread to nearby tissues or lymph nodes but not to distant organs, the prognosis is still relatively favorable, though the survival rate is lower than for localized disease. For tumors that have metastasized to distant parts of the body, such as the liver or lungs, the five-year survival rate drops to around 23%.^[13] However, it’s important to remember that survival statistics are averages and cannot predict what will happen to any individual person. Many factors, including your overall health, response to treatment, and access to specialized care, play a role in your outcome.

Pancreatic neuroendocrine tumors are much less common than other types of pancreatic cancer and generally have a better prognosis. With advances in treatment options, including surgery, targeted therapies, and new clinical trials, many people with these tumors are living longer and maintaining a good quality of life.^[3]^[7]

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Pancreatic neuroendocrine tumour – Diagnostics

Introduction: Who Should Undergo Diagnostics and When