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Understanding Ascites in Pancreatic Cancer

Ascites (pronounced aye-site-eez) is the medical name for a build up of fluid in the tummy (abdomen). If the ascites is caused by cancer it can also be called malignant ascites.

Medical imaging showing ascites: fluid buildup in abdominal cavity, common in pancreatic cancer patients
Illustration showing ascites (fluid accumulation) in the abdominal cavity, a common complication in advanced pancreatic cancer. (Photo credit: Mikael Häggström)

What is Ascites in Pancreatic Cancer?


Ascites is the medical term for a buildup of fluid in the abdominal cavity. In pancreatic cancer patients, this condition is often referred to as malignant ascites. It occurs when excess fluid accumulates between the two layers of the peritoneum, the membrane lining the abdominal cavity.

Clinical image illustrating significant abdominal swelling in a person living with ascites, highlighting the visible signs of fluid buildup.
Side view of a swollen and enlarged abdomen in a person living with advanced ascites, showing the characteristic appearance and severity of fluid buildup.

Heather developed ascites during the last two or three weeks of her life. While doctors in Canada signaled it was the final stages of the disease, our oncologist at Johns Hopkins wanted to rule out other causes, such as a blockage. Testing was completed and confirmed it was not due to a blockage. Watching Heather’s stomach swell and become uncomfortably tight was a traumatic experience, and ascites remains one of the most distressing complications of pancreatic cancer.

Causes of Ascites in Pancreatic Cancer

Malignant ascites can be caused by multiple factors, including:

  1. Irritation of the Peritoneal Lining: Cancer cells can irritate and inflame the peritoneum, leading to fluid production.
  2. Lymphatic Blockage: Cancerous growths may obstruct lymph glands, impairing fluid drainage.
  3. Liver Metastasis: When cancer spreads to the liver, it increases pressure in abdominal blood vessels, contributing to fluid accumulation.
  4. Reduced Blood Protein Production: Pancreatic cancer can impair liver function, decreasing protein levels like albumin, which helps maintain fluid balance.
Infographic of common ascites symptoms in pancreatic cancer: abdominal swelling, weight gain, shortness of breath, fatigue, and more.
An infographic detailing common symptoms of ascites in pancreatic cancer, including abdominal swelling, rapid weight gain, fatigue, and shortness of breath.


Symptoms and Diagnosis

Common Symptoms


People living with pancreatic cancer who develop ascites may experience:

  • Abdominal swelling and tightness
  • Rapid weight gain
  • Shortness of breath
  • Loss of appetite
  • Nausea and indigestion
  • Fatigue

Diagnostic Procedures


Diagnosing ascites involves several steps:

  1. Physical Examination: Doctors may detect fluid buildup during an abdominal check.
  2. Imaging Tests: Ultrasounds and CT scans confirm the presence and extent of fluid.
  3. Blood Tests: These evaluate protein levels and liver function.
  4. Paracentesis: A thin needle or catheter is used to extract fluid from the abdomen for analysis. This helps identify the cause, check for infections, and examine fluid composition.
IV bag containing Alburex being administered for fluid management in advanced pancreatic cancer to alleviate ascites-related symptoms.
Close-up of an Alburex IV bag used in managing ascites that Heather developed during the course of treatment. This treatment helps alleviate fluid buildup and improve comfort.

Treatment Options


Management of ascites in pancreatic cancer patients focuses on symptom relief:


1. Paracentesis: A procedure to remove the fluid from the abdome.
2. Diuretics: Medications like spironolactone help reduce fluid buildup by promoting its removal through urine.
3. Targeted Therapies: Treatments such as bevacizumab (an anti-angiogenic agent) may reduce fluid accumulation by targeting specific cancer pathways.
4. Immunotherapies: These emerging treatments show promise in managing malignant ascites.
5. Concentrated Ascites Reinfusion Therapy (CART): This technique filters and reinfuses ascitic fluid to alleviate symptoms.

Heather Cutler advocates for herself in a makeshift space at St. John’s Health Sciences Centre, highlighting healthcare challenges.
The image captures a pivotal moment of self-advocacy in Heather Cutler’s pancreatic cancer journey. A nurse with 35 years of experience, she sits in a makeshift space at St. John’s Health Sciences Centre after refusing to stay in a ward with COVID-positive patients. The scene, with Heather sipping a smoothie in a salvaged recliner, highlights healthcare challenges during the pandemic, including overcrowding and limited resources. 

Personal Experience with Heather

Paracentesis is the most common treatment. Initially, it’s a quick in-and-out procedure to drain excess fluid. However, when the fluid inevitably returns, patients are often given a permanent drain to manage the fluid at home for their comfort.

Initially, the staff at Health Sciences and the oncology team did not provide any instructions after the permanent drain was placed, and the fluid was drained continuously.

What was not communciated was that this fluid contains multiple components, including protein albumin, which can be significantly depleted during drainage, further weakening the patient.

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Prognosis and Quality of Life


The development of ascites in pancreatic cancer patients often indicates advanced disease and is associated with a poor prognosis. Studies have shown that median survival after the onset of ascites is approximately 1.8 to 2 months.

Despite this, proactive symptom management and emerging treatments can improve comfort and extend quality of life.

Modern laboratory equipment arrangement in purple lighting, showcasing research vessels and scientific instruments.

Current Research and Future Directions


Exciting advancements in treating malignant ascites aim to improve symptom relief and survival rates. Areas of research include:

  1. Novel Diagnostic Biomarkers: Identifying specific markers in ascitic fluid for better diagnosis and treatment planning.
  2. Immunotherapy Approaches: Therapies using immune cells or checkpoint inhibitors to target cancer cells.
  3. Targeted Molecular Therapies: Drugs that inhibit cancer growth pathways.
  4. Improved Palliative Care: Strategies to enhance comfort and quality of life.


Bevacizumab and Other Targeted Agents

  • Bevacizumab: This anti-angiogenic drug has shown potential in reducing fluid buildup. Intraperitoneal administration extended the time between paracentesis procedures in some studies.
  • Apatinib with Gemcitabine: This combination increased progression-free survival and reduced the frequency of paracentesis in some cases.
  • NK4 Therapy: Targeting specific growth factor receptors, NK4 suppressed fluid buildup in animal models.


Immunotherapy


Immunotherapy has emerged as a promising avenue for treating malignant ascites:

  • Intraperitoneal nivolumab reduced fluid buildup and cancer cell presence in ascitic fluid.
  • CART improved symptoms, enhanced immune response, and enabled chemotherapy.
  • Combining NK cells with PD-1 inhibitors activated immune cells and targeted cancer effectively.

Novel Delivery Methods

Pressurized Intraperitoneal Aerosol Chemotherapy (PIPAC)
PIPAC using nanoparticle albumin-bound paclitaxel (NAB-PTX) has shown positive responses in 35% of patients with peritoneal metastases, including those from pancreatic cancer.


Hyperthermic Intraperitoneal Chemotherapy (HIPEC)
Laparoscopic HIPEC reported complete resolution of ascites in 94% of patients with peritoneal carcinomatosis.

Combination Therapies


Research is exploring various combination approaches:


• Intraperitoneal paclitaxel combined with intravenous nab-paclitaxel and gemcitabine increased overall survival, though peritoneal recurrence occurred in 75% of patients.
• Intraperitoneal cisplatin with intravenous gemcitabine and regional hypothermia showed partial response in 13 out of 29 patients, with a median overall survival of 195 days.

Oncolytic Therapy


Intraperitoneal oncolytic therapy has shown positive ascites control in 8 out of 13 patients in one study.

These advancements offer new hope for managing malignant ascites in pancreatic cancer patients. However, it’s important to note that many of these treatments are still in experimental stages and require further research to establish their efficacy and safety in larger patient populations.

What is ascites in pancreatic cancer?

Ascites in pancreatic cancer refers to the buildup of fluid in the abdominal cavity, often called malignant ascites. This occurs when fluid collects between the layers of the peritoneum, the membrane that lines the abdomen.

What causes ascites in pancreatic cancer patients ?

Ascites can develop due to several factors, such as cancer cells irritating the abdominal lining, blockages in the lymphatic system, cancer spreading to the liver, or lower blood protein levels caused by liver dysfunction.

What are the symptoms of ascites in pancreatic cancer?

Symptoms of ascites often include a swollen or tight abdomen, rapid weight gain, shortness of breath, loss of appetite, nausea, indigestion, and fatigue.

How is ascites diagnosed in pancreatic cancer patients?

Doctors diagnose ascites through a physical exam, imaging tests like ultrasounds or CT scans, blood tests, and a procedure called paracentesis, which involves taking a sample of the fluid for testing.

What is the prognosis for pancreatic cancer patients with ascites?

The presence of ascites in pancreatic cancer usually indicates advanced disease. On average, survival after the onset of ascites is about 1.8 to 2 months, though every individual is unique so outcomes can vary.

How is ascites treated in pancreatic cancer patients?

Treatment options for ascites include paracentesis to remove fluid, diuretics to reduce fluid buildup, and therapies such as targeted treatments, immunotherapy, or Concentrated Ascites Reinfusion Therapy (CART).

What is paracentesis and how is it used to treat ascites?

Paracentesis is a procedure where a needle or catheter is used to drain excess fluid from the abdomen. It can provide significant relief from symptoms like abdominal swelling and discomfort and usually is performed multiple times before a permanent drain is considered.

Can ascites in pancreatic cancer be prevented?

While ascites can’t always be prevented, early treatment of pancreatic cancer and careful management of liver health and nutrition may help delay its onset.

How does ascites affect quality of life in pancreatic cancer patients?

Ascites can cause discomfort, difficulty breathing, and reduced mobility, which may affect daily life. However, managing symptoms early and effectively can help improve comfort and overall quality of life.

What new treatments are being researched for ascites in pancreatic cancer?

Research is exploring innovative treatments, including diagnostic biomarkers, targeted molecular therapies, immunotherapy, and advanced palliative care approaches. Promising areas of study include bevacizumab and oncolytic therapy.


References List 📚

  1. Han, S., & Borazanci, E. (2023). Malignant ascites in pancreatic cancer: Pathophysiology, diagnosis, and treatment. Frontiers in Oncology, 13, 1130766.
  2. Jordan, K., et al. (2016). A randomized phase II study evaluating the efficacy and safety of intraperitoneal bevacizumab in patients with malignant ascites due to advanced ovarian cancer. Gynecologic Oncology, 141(Suppl 1), 54-55.
  3. Tomioka, H., et al. (2001). Inhibition of tumor growth and invasion by a four-kringle antagonist (HGF/NK4) for hepatocyte growth factor. Oncogene, 20(55), 8050-8057.
  4. Wang, Y., et al. (2019). Nivolumab plus ipilimumab in patients with advanced non-small-cell lung cancer and high tumor mutational burden: First results from the CheckMate 227 cohort. Journal of Clinical Oncology, 37(15_suppl), 9012-9012.
  5. Shirakawa, H., et al. (2018). Concentrated ascites reinfusion therapy (CART) for malignant ascites: A phase II study. Supportive Care in Cancer, 26(5), 1427-1435.
  6. Chen, Y., et al. (2019). NK cells combined with PD-1 blockade therapy for the treatment of ascites secondary to hepatocellular carcinoma: A case report. Immunotherapy, 11(4), 265-272.
  7. Zhang, B., et al. (2022). Intraperitoneal oncolytic virotherapy for patients with malignant ascites: Characterization of clinical efficacy and antitumor immune response. Molecular Therapy - Oncolytics, 24, 578-587.
  8. Cancer Research UK. (2024). About fluid in the abdomen (ascites). Cancer Research UK.
  9. Gupta, A., Sedhom, R., & Beg, M.S. (2020). Ascites, or Fluid in the Belly, in Patients With Cancer. JAMA Oncology, 6(2), 308.
  10. Pancreatic Cancer UK. (2024). End of life care: Swelling, ascites and oedema. Pancreatic Cancer UK.

Heather Cutler Foundation profile image Heather Cutler Foundation
Team Heather is Canada’s newest advocacy publication for people living with Pancreatic Cancer offering up-to-date guidelines, access to supports and more.