Peritoneal Mesothelioma: Understanding This Rare Abdominal Cancer

Written by Medicover Team and Medically Reviewed by Dr Kovvuru Bhaskar Reddy , Oncologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Peritoneal mesothelioma is a rare cancer that develops in the peritoneum, the thin layer of tissue lining the abdominal cavity and covering many abdominal organs. It is a type of mesothelioma distinct from the more common pleural mesothelioma, which affects the lining around the lungs.

Peritoneal mesothelioma is strongly associated with asbestos exposure, although not every person with the disease has a known history of exposure. The condition may cause abdominal pain, swelling, fluid accumulation, loss of appetite, weight loss, nausea, and changes in bowel habits. Because these symptoms can resemble other abdominal conditions, diagnosis often requires imaging, biopsy, and specialized pathological testing.

What Are the Symptoms of Peritoneal Mesothelioma?

Symptoms of peritoneal mesothelioma are often nonspecific and may develop gradually. They can resemble symptoms caused by other gastrointestinal or abdominal disorders. The buildup of fluid in the abdomen, known as ascites, is particularly common and may cause progressive abdominal enlargement.

Common symptoms include:

Abdominal pain: Persistent or recurring pain or discomfort in the abdomen.
Abdominal swelling: Enlargement of the abdomen, often related to ascites or tumor growth.
Bloating: A sensation of abdominal fullness or pressure.
Loss of appetite: Reduced appetite or feeling full after eating only a small amount.
Unexplained weight loss: Weight loss that occurs without intentional dietary or lifestyle changes.
Nausea and vomiting: These may occur when the disease affects or compresses abdominal organs.
Changes in bowel habits: Constipation, diarrhea, or other changes in bowel function may occur.
Fatigue: Persistent tiredness or weakness may develop as the disease progresses.
Abdominal mass: Some patients may have a palpable lump or increased abdominal fullness.

Persistent or progressive abdominal symptoms, particularly in someone with a history of asbestos exposure, should be medically evaluated.

What Are the Causes of Peritoneal Mesothelioma?

The exact mechanism by which peritoneal mesothelioma develops is not completely understood. Asbestos exposure is the most important recognized risk factor. Asbestos fibers may be swallowed after being cleared from the respiratory tract or may reach the abdominal cavity through other routes. Once present in the peritoneum, persistent irritation and inflammation can contribute to cellular and genetic damage over many years.

However, asbestos exposure does not explain every case, and some people develop peritoneal mesothelioma without a clearly identified exposure.

Asbestos exposure: Exposure to asbestos fibers is the strongest established risk factor for peritoneal mesothelioma.
Chronic inflammation: Persistent irritation caused by asbestos fibers may contribute to abnormal changes in mesothelial cells.
Cellular and genetic damage: Long-term exposure and inflammation can contribute to genetic alterations that promote uncontrolled cell growth.
Occupational exposure: Historically, construction, shipbuilding, insulation, mining, and some manufacturing occupations involved significant asbestos exposure.
Unknown causes: Some patients develop peritoneal mesothelioma despite having no known history of asbestos exposure.

The disease generally has a long latency period, meaning that mesothelioma may develop decades after asbestos exposure.

When to See a Doctor?

Consult an oncologist or healthcare provider if you experience persistent or unexplained abdominal symptoms that may require evaluation for Peritoneal Mesothelioma.

Persistent abdominal pain, bloating, or swelling
Unexplained weight loss or loss of appetite
Persistent nausea, vomiting, or changes in bowel habits
Increasing abdominal fullness or fluid accumulation
Abdominal symptoms together with a history of significant asbestos exposure

Get medical help immediately if:

Severe or rapidly worsening abdominal pain
Persistent vomiting or inability to keep fluids down
Rapid abdominal swelling associated with severe discomfort or breathing difficulty
Inability to pass stool or gas with significant abdominal pain or vomiting
Severe weakness, confusion, or other signs of serious illness

Early evaluation can help identify the cause of persistent abdominal symptoms and allow appropriate treatment to begin as soon as possible.

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How Is Peritoneal Mesothelioma Diagnosed?

Diagnosing peritoneal mesothelioma can be challenging because its symptoms overlap with many other abdominal conditions. Diagnosis generally requires a combination of medical history, physical examination, imaging, and tissue sampling.

Medical history and physical examination: The healthcare provider evaluates abdominal symptoms, swelling, fluid accumulation, palpable masses, and any history of asbestos exposure.
CT scan: CT imaging of the abdomen and pelvis can identify peritoneal thickening, tumor deposits, ascites, and involvement of nearby structures.
MRI: MRI can provide detailed soft-tissue information and may help assess the extent of peritoneal disease in selected patients.
PET/CT: PET imaging may be used in selected cases to evaluate metabolically active disease and assess possible spread beyond the peritoneal cavity.
Biopsy: A tissue biopsy is usually required to establish a definitive diagnosis.
Laparoscopy: Diagnostic laparoscopy can allow direct examination of the peritoneum, assessment of disease distribution, and collection of tissue samples.
Histopathology and immunohistochemistry: Specialized pathological testing helps distinguish mesothelioma from metastatic adenocarcinoma and other cancers affecting the peritoneum.
Ascitic fluid analysis: Fluid removed from the abdomen may be analyzed, although cytology alone may not reliably establish or exclude peritoneal mesothelioma.

A multidisciplinary team involving surgeons, medical oncologists, radiologists, and specialist pathologists may be required for accurate diagnosis and treatment planning.

What Are the Treatment Options for Peritoneal Mesothelioma?

Treatment depends on the histological type and grade of the tumor, extent of disease, whether complete cytoreduction is feasible, and the patient's overall health. Treatment is often managed at a specialist center with experience in peritoneal surface malignancies.

Cytoreductive Surgery and HIPEC

For selected patients whose disease is considered operable, cytoreductive surgery (CRS) may be performed to remove visible tumor deposits from the abdominal cavity. This may be followed by hyperthermic intraperitoneal chemotherapy (HIPEC), in which heated chemotherapy is circulated directly within the abdomen to target remaining microscopic cancer cells.

Systemic Chemotherapy

Systemic chemotherapy uses medicines that travel through the bloodstream to treat cancer throughout the body. Regimens may include pemetrexed combined with a platinum-based drug such as cisplatin or carboplatin, depending on the individual clinical situation.

Immunotherapy

Immunotherapy may be considered for some patients, particularly when surgery is not appropriate or when the disease has progressed despite other treatments. The suitability of specific immunotherapy drugs depends on the tumor characteristics and applicable treatment guidelines.

Targeted Therapy and Clinical Trials

Targeted treatments are being investigated for specific molecular abnormalities associated with mesothelioma. Participation in clinical trials may provide access to emerging therapies when standard treatment options are limited.

Radiation Therapy

Radiation therapy is not usually the primary treatment for diffuse peritoneal mesothelioma because of the large area involved and the sensitivity of abdominal organs. It may occasionally be used for selected localized disease or symptom relief.

Supportive and Palliative Care

Supportive treatment can help control symptoms and maintain quality of life. Management may include treatment of ascites, pain control, nutritional support, and management of nausea or other treatment-related symptoms.

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What Are the Risk Factors for Peritoneal Mesothelioma?

Several factors may increase the likelihood of developing peritoneal mesothelioma. The most important is exposure to asbestos, although the relationship between asbestos exposure and peritoneal mesothelioma is less clearly defined than it is for pleural mesothelioma.

Asbestos exposure: Occupational or environmental exposure to asbestos is the principal recognized risk factor.
Occupational history: People who worked in construction, shipbuilding, insulation, asbestos processing, or related industries may have had greater exposure.
Secondary exposure: Family members of workers exposed to asbestos may have experienced exposure from contaminated clothing or materials brought home.
Age: Peritoneal mesothelioma is more frequently diagnosed in adults, although it can occur at younger ages.
Genetic susceptibility: Certain inherited or acquired genetic alterations may contribute to susceptibility in some individuals.
Radiation exposure: Previous therapeutic radiation has been associated with an increased risk of some mesotheliomas, although this is uncommon.

How Is Peritoneal Mesothelioma Staged?

Peritoneal mesothelioma does not have a universally accepted conventional TNM staging system comparable to that used for many other cancers. Specialists commonly assess the extent of disease using the Peritoneal Cancer Index (PCI), which estimates the distribution and volume of tumor throughout the abdominal cavity.

The PCI divides the abdomen into regions and assigns scores according to the size of tumor deposits. A lower PCI generally indicates a smaller tumor burden, while a higher PCI indicates more extensive disease. The extent of tumor involvement, whether complete cytoreduction is possible, tumor histology, and the patient's overall health are important when determining treatment and prognosis.

What Is the Prognosis of Peritoneal Mesothelioma?

The prognosis of peritoneal mesothelioma varies considerably between individuals. Outcomes depend on factors such as tumor type, extent of disease, PCI score, whether the tumor can be completely or nearly completely removed, overall health, and response to treatment.

Some patients, particularly those with disease that can be effectively treated with cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (HIPEC), can have substantially better outcomes than historical survival estimates. Therefore, a single median survival figure should not be used to predict an individual patient's outcome.

What Are the Complications of Peritoneal Mesothelioma?

Peritoneal mesothelioma can cause complications as the tumor grows or spreads throughout the abdominal cavity. The complications depend on the extent and location of the disease.

Ascites: Accumulation of fluid in the abdomen can cause swelling, pressure, discomfort, and difficulty eating.
Bowel obstruction: Tumor deposits or adhesions may interfere with normal intestinal movement and, in advanced disease, cause obstruction.
Malnutrition and weight loss: Reduced appetite, early fullness, and cancer-related changes can make it difficult to maintain adequate nutrition.
Abdominal pain: Increasing tumor burden can cause persistent or worsening abdominal discomfort.
Spread of cancer: The disease may progress within the peritoneal cavity and, in advanced cases, involve other organs or distant sites.
Reduced quality of life: Pain, fatigue, digestive symptoms, and repeated procedures can significantly affect daily activities and well-being.

What Are the Emerging Treatments for Peritoneal Mesothelioma?

Research into peritoneal mesothelioma continues to explore ways of improving long-term disease control while reducing treatment-related complications. New approaches are being studied in clinical trials and specialist centers.

Immunotherapy: Immune checkpoint inhibitors and other immune-based treatments are being studied for their ability to help the immune system recognize and attack mesothelioma cells.
Targeted therapies: Researchers are investigating treatments directed at specific molecular pathways or genetic changes involved in tumor growth.
Novel intraperitoneal treatments: New methods of delivering anticancer drugs directly into the abdominal cavity are being investigated.
Combination therapies: Studies are evaluating combinations of surgery, HIPEC, systemic therapy, and immunotherapy to improve treatment outcomes.
Clinical trials: Clinical trials may provide access to investigational treatments and are an important part of advancing care for this rare cancer.

How Can Peritoneal Mesothelioma Be Prevented?

There is no guaranteed way to prevent peritoneal mesothelioma, but reducing exposure to asbestos is the most important preventive measure.

Avoid asbestos exposure: Do not handle asbestos-containing materials unless properly trained and protected.
Follow workplace safety measures: Workers in industries where asbestos may be present should follow applicable occupational safety procedures and use appropriate protective equipment.
Professional asbestos removal: Suspected asbestos-containing materials in older buildings should be assessed and removed by qualified professionals rather than disturbed unnecessarily.
Report persistent symptoms: People with previous occupational or environmental asbestos exposure should seek medical evaluation for persistent or unexplained abdominal symptoms.