Pancreatic Cancer

Pancreatic cancer is cancer that develops in the pancreas, a small but essential organ located deep in the abdomen, behind the stomach and between the liver and intestine. The pancreas performs two distinct jobs: its exocrine cells produce digestive enzymes that are released into the small intestine to help break down food, while its endocrine cells (found in clusters called the islets of Langerhans) produce hormones such as insulin and glucagon that are released directly into the bloodstream to regulate blood sugar. Pancreatic cancer develops when cells within the pancreas begin to grow and divide uncontrollably, most often within the ducts that carry digestive enzymes out of the gland.

Pancreatic cancer is notoriously difficult to detect early. Because the pancreas sits deep within the abdomen and its early changes rarely cause noticeable symptoms, the disease is frequently diagnosed only after it has grown significantly or spread beyond the pancreas — at a stage when treatment options are more limited. This is one of the key reasons pancreatic cancer is regarded as one of the more serious cancer diagnoses, and why awareness of risk factors and early warning signs matters so much.

Types of Pancreatic Cancer

Pancreatic cancer is broadly divided into two categories, based on which part of the pancreas the cancer originates from — a distinction that has an important bearing on how the cancer behaves and how it is treated.

• Pancreatic Ductal Adenocarcinoma: The most common type of exocrine pancreatic cancer by far, accounting for the large majority of cases, arising from the cells lining the ducts that carry digestive enzymes out of the pancreas.
• Other Exocrine Cancers: Rarer forms include adenosquamous carcinoma, squamous cell carcinoma, giant cell carcinoma, acinar cell carcinoma and small cell carcinoma, each arising from different exocrine cell types within the pancreas.
• Pancreatic Neuroendocrine Tumours (Islet Cell Tumours): A rare type of pancreatic cancer that develops from hormone-producing cells. These tumours usually grow more slowly than other pancreatic cancers and are classified based on the hormone-producing cells they arise from.

How Pancreatic Cancer Develops and Spreads

Understanding the pancreas's location and function helps explain why pancreatic cancer behaves the way it does:

• Deep, hidden location: The pancreas sits deep within the abdomen, surrounded by other major organs and blood vessels, meaning tumours can grow for some time without being felt or causing obvious symptoms.
• Silent early growth: Because the pancreas has some functional reserve, and early tumours don't typically press on nearby structures, the earliest stages of pancreatic cancer often cause no noticeable symptoms at all.
• Local spread: As a tumour grows, it can invade surrounding structures, including the bile duct, duodenum, and major blood vessels supplying the abdominal organs, which is why tumour location relative to these vessels is central to treatment planning.
• Early distant spread: Pancreatic cancer has a tendency to spread to distant sites — most commonly the liver, lungs and the lining of the abdominal cavity (peritoneum) — often before it is large enough to cause symptoms.
• Impact on pancreatic function: As the cancer grows, it can impair the pancreas's ability to produce digestive enzymes and regulate blood sugar, contributing to some of the symptoms associated with the disease.

Symptoms of Pancreatic Cancer

Pancreatic cancer often causes no symptoms until it is more advanced, which is one of the central challenges in diagnosing it early. When symptoms do appear, they can include:

• Jaundice, or the yellowing of the skin and eyes, caused by the tumor blocking the bile duct
• Pale or light-coloured stools, and darker urine, often occurring alongside jaundice
• Itching, related to the build-up of bile products in the skin
• Intermittent or persistent pain in the upper abdomen, which may spread through to the back
• Unexplained weight loss and loss of appetite
• Fatigue
• Diarrhoea, or changes in bowel habit
• Nausea
• New-onset diabetes, or difficulty controlling existing diabetes, without another clear explanation
• Pain or swelling in the limbs, related to blood clots that can occur more frequently with pancreatic cancer

Because many of these symptoms — such as abdominal discomfort, fatigue or changes in bowel habit — are common to many far less serious conditions, they are often not recognised as warning signs of pancreatic cancer until the disease is more advanced. Persistent or unexplained symptoms, particularly in combination, are always worth discussing with a doctor.

Risk Factors for Pancreatic Cancer

Several factors are known to increase the risk of developing pancreatic cancer:

• Older age: The large majority of cases occur in people over 60, with risk continuing to rise with age.
• Smoking: One of the most significant modifiable risk factors, roughly doubling the risk of pancreatic cancer compared to non-smokers.
• Type 2 diabetes: Long-standing type 2 diabetes is associated with a higher risk, and new-onset diabetes in an older adult can, less commonly, be an early sign of pancreatic cancer itself.
• Chronic pancreatitis: Long-term inflammation of the pancreas, often related to heavy alcohol use, significantly increases the risk of pancreatic cancer over time.
• Family history and genetics: A family history of pancreatic cancer, or inherited genetic syndromes affecting cancer risk, meaningfully increases individual risk.
• Obesity: Carrying excess weight is associated with a higher risk of developing pancreatic cancer.
• Heavy alcohol consumption: Excessive long-term alcohol use increases risk, partly through its association with chronic pancreatitis.
• Diet: A diet high in red and processed meat and low in fruits and vegetables has been associated with a modestly increased risk in some studies.

Stages of Pancreatic Cancer

Once diagnosed, pancreatic cancer is staged to describe how far it has spread, which is central to determining the most appropriate treatment approach — particularly whether surgery to remove the tumor is possible.

• Resectable (Early-Stage): The tumor is confined to the pancreas, or has only minimal involvement of nearby structures, without involving major blood vessels — meaning it can potentially be surgically removed.
• Borderline Resectable: The tumor has some involvement with nearby blood vessels, making surgical removal more technically challenging; chemotherapy or radiotherapy is often given first to try to shrink the tumour before surgery is considered.
• Locally Advanced (Unresectable): The tumor has grown to involve major blood vessels extensively, making surgical removal unsafe or not possible, although there is no evidence of spread to distant organs. Treatment focuses on chemotherapy, radiotherapy, and symptom control.
• Metastatic (Stage IV): The cancer has spread to distant organs, most commonly the liver, lungs or peritoneum. Treatment focuses on chemotherapy and supportive care to control the cancer, manage symptoms, and maintain quality of life for as long as possible.

Because early symptoms are so often absent, a significant proportion of pancreatic cancers are diagnosed at the locally advanced or metastatic stage — which is precisely why awareness of risk factors and prompt evaluation of persistent symptoms matters so much for this particular cancer.

Possible Complications of Pancreatic Cancer

Both the cancer itself and its effects on nearby structures can lead to a range of complications, many of which require active management alongside cancer-directed treatment:

• Bile duct obstruction and jaundice: A tumor pressing on or blocking the bile duct prevents bile from draining normally, causing jaundice, itching and digestive difficulty, and often requiring a stent to relieve the blockage.
• Bowel obstruction: A tumor can occasionally press on or block the duodenum (the first part of the small intestine), causing nausea, vomiting and difficulty eating.
• Weight loss and malnutrition: Reduced digestive enzyme production, poor appetite and the metabolic effects of cancer can lead to significant, progressive weight loss and nutritional deficiency.
• Diabetes: Damage to the insulin-producing cells of the pancreas, either from the tumor itself or from treatment, can lead to new or worsening diabetes.
• Blood clots: Pancreatic cancer is associated with a higher risk of blood clots forming in the legs or lungs, which can cause pain, swelling or breathing difficulty and requires prompt treatment.
• Pain: Tumor involvement of nerves surrounding the pancreas can cause persistent abdominal or back pain, which is actively managed as part of overall care.
• Distant spread (metastasis): Most commonly to the liver, lungs and peritoneum, which can cause a range of further symptoms depending on the organs affected.

How Pancreatic Cancer Is Diagnosed

If pancreatic cancer is suspected, based on symptoms or incidental findings, a combination of imaging, blood tests and tissue sampling is used to confirm the diagnosis and determine the extent of disease.

• Ultrasound: Often the first imaging test used, particularly for investigating jaundice or abdominal pain, and can identify masses in the pancreas or blockage of the bile duct.
• CT Scan: Provides detailed cross-sectional images of the pancreas and surrounding structures, helping to identify a tumour, assess its size and relationship to nearby blood vessels, and check for spread to other organs.
• MRI and MRCP: Provides detailed imaging of the pancreas and bile ducts, particularly useful for further characterising a suspicious mass or evaluating the pancreatic and bile ducts in more detail.
• Endoscopic Ultrasound (EUS): A specialised procedure combining endoscopy and ultrasound to obtain detailed, close-up images of the pancreas from within the digestive tract, and often used to guide biopsy of a suspicious area.
• Biopsy: A tissue sample is taken from any suspicious mass or growth in the pancreas, usually guided by endoscopic ultrasound or CT, and examined under a microscope to confirm the diagnosis and cancer type.
• Blood Tests: A complete blood count and liver function tests provide useful general information, while a tumour marker called CA 19-9 may be raised in pancreatic cancer and can help support the diagnosis and monitor treatment response, although it is not specific enough to diagnose the cancer on its own.

Managing Life with Pancreatic Cancer

Because pancreatic cancer and its treatment can significantly affect digestion, nutrition and daily comfort, proactive symptom management plays a central role in overall care, alongside cancer-directed treatment.

Pancreatic enzyme replacement, taken with meals, can help address digestive difficulty and weight loss that result from reduced enzyme production, and a dietitian can provide tailored guidance on eating enough, and eating well, even when appetite is reduced. Blood sugar monitoring and management become particularly important if diabetes develops or worsens as a result of the cancer or its treatment.

Pain management is individualised and may involve medication, nerve block procedures, or other interventions to keep discomfort well controlled. Given the physical and emotional demands of a pancreatic cancer diagnosis, many patients and families also benefit from psychological support and palliative care services, which can be introduced alongside active treatment at any stage — not only at the end of life — to support quality of life and symptom control throughout the treatment journey.

Reducing Your Risk of Pancreatic Cancer

While pancreatic cancer cannot always be prevented, several measures may help reduce your risk:

• Avoid smoking: Not smoking, or quitting if you currently smoke, is one of the most effective ways to reduce your risk of pancreatic cancer.
• Maintain a healthy weight: Reducing excess body weight through a balanced diet and regular exercise may help lower your risk.
• Limit alcohol consumption: Reducing heavy alcohol use lowers your risk of chronic pancreatitis and, in turn, pancreatic cancer.
• Manage diabetes well: Good long-term control of type 2 diabetes may help reduce the associated increase in pancreatic cancer risk.
• Eat a balanced diet: A diet rich in fruits, vegetables and whole grains, with limited red and processed meat, supports overall health and may help lower cancer risk.
• Know your family history: If you have a family history of pancreatic cancer or a related genetic syndrome, discuss this with your doctor, as genetic counselling or earlier screening may be appropriate.