Peritoneal Carcinoma Metastatic

Peritoneal carcinoma metastatic occurs when cancer from another organ spreads to the peritoneum, the membrane lining the abdominal cavity. While this condition is serious and typically represents advanced disease, modern treatments combining surgery and specialized chemotherapy are helping patients live longer and improve their quality of life.

Table of contents

• What is Peritoneal Carcinoma Metastatic?
• Who is at Risk?
• Signs and Symptoms
• What Causes This Condition?
• How is it Diagnosed?
• Treatment Options

What is Peritoneal Carcinoma Metastatic?

Peritoneal carcinoma metastatic, also called peritoneal carcinomatosis (a medical term describing cancer that has spread to the peritoneum), is cancer that has spread to the peritoneum from another organ in the body^[1][2]. The peritoneum is a thin membrane that covers the inner lining of the abdominal cavity and the organs located there. It helps support these organs and contains blood vessels and nerves that supply them^[1].

When cancer spreads from other organs to the peritoneum, this process is called metastasis (the spreading of cancer from its original site to other parts of the body)^[1]. This condition is different from cancer that starts in the peritoneum itself, which is very rare^[1][2].

Peritoneal carcinoma metastatic is considered advanced disease and usually indicates Stage IV cancer in most cases^[1][3]. The condition is also called a late-stage or metastatic cancer, which is usually more serious than early-stage cancers^[2]. However, treatments are available that can help slow disease progression and help people live longer^[2][3].

Peritoneal carcinomatosis, Peritoneal metastases, Peritoneal cancer

Who is at Risk?

Any type of cancer can spread to the peritoneum, but certain cancers are more likely to cause peritoneal carcinoma metastatic than others^[2]. The primary cancers (the original cancers) most likely to lead to this condition include^[2][3]:

• Ovarian cancer (the most common cause)
• Colon cancer
• Stomach cancer (also called gastric cancer)
• Appendix cancer
• Pancreatic cancer
• Rectal cancer

Patients who suffer from cancers mainly of abdominal origins such as gastric (stomach), ovarian, colorectal, appendix, and pancreas cancers are at risk of developing peritoneal metastases^[1]. Less commonly, other cancers can also spread to the peritoneum^[1].

Signs and Symptoms

Peritoneal carcinoma metastatic does not usually cause symptoms until it affects a large portion of the peritoneum^[2][3]. Some people may notice symptoms early, while others may not feel anything until the disease has progressed further^[3]. Symptoms often become more noticeable when cancer cells grow and start affecting nearby organs, such as the intestines, bladder, and stomach^[3].

The most common symptom is abdominal swelling or bloating caused by fluid buildup in the abdomen, called ascites (an abnormal collection of fluid in the abdominal cavity)^[1][3]. A person may feel that they are gaining weight in the belly despite exercise, and women in menopause may appear as if they are pregnant^[3].

Other common symptoms include^[2][3]:

• Fatigue or feeling very tired, even after resting
• Abdominal pain or discomfort, often described as vague cramping or pressure-like pain
• Abdominal mass
• Low back pain
• Loss of appetite or feeling full quickly, even after small meals
• Nausea and vomiting
• Constipation or other bowel changes
• Unexplained weight loss or weight gain

These symptoms are common across many conditions, and many of them are not as serious as peritoneal carcinoma metastatic. However, only a healthcare provider can rule out cancer in the peritoneum^[2].

What Causes This Condition?

Peritoneal carcinoma metastatic forms when cancer in one part of the body travels to the peritoneum. Usually, the cancer begins in a nearby organ in the abdomen, like the ovaries or colon^[2].

In about 10% of people with peritoneal carcinoma metastatic, cancer starts in organs outside of the abdominal cavity. When this happens, cancer cells use the bloodstream or lymphatic system (a network of tissues and organs that help rid the body of toxins and waste) to reach the peritoneum^[2].

Cancer implants tend to locate in specific areas where the peritoneal fluid naturally slows down or collects. These areas include the pelvic peritoneal reflections, right and left paracolic gutters, superior part of the sigmoid mesocolon, ileocolic area, and the right subdiaphragmatic space^[5].

How is it Diagnosed?

Diagnosing peritoneal carcinoma metastatic can be challenging because the cancer often spreads across the abdominal lining without forming distinct masses. Doctors usually need to combine several different tests to confirm a diagnosis^[8].

Tests that may be used to diagnose peritoneal carcinoma metastatic include^[2][8]:

Imaging tests: These are typically the first step in looking for suspected peritoneal carcinoma metastatic. Procedures may include a CT scan (a procedure that uses X-rays and computers to create detailed images), MRI (a test that uses magnets and radio waves to create images), PET scan (a test that uses radioactive substances to look at body function), or a combination of these. These scans help identify visible tumor spread, fluid buildup, or organ involvement^[8]. However, imaging is often not sensitive enough to detect smaller cancers or early peritoneal disease, so a negative scan does not rule out peritoneal carcinoma metastatic^[8].

Blood tests: A healthcare provider may check blood for tumor markers, which are substances that tumors release. High levels of certain proteins may be a sign of peritoneal carcinoma metastatic^[2].

Paracentesis: If there is fluid in the abdomen (ascites), a provider may remove a sample of this fluid and test it in a lab for signs of the primary cancer (the cancer that has spread)^[2]. This test involves surgically collecting fluid from the abdominal cavity and examining it under a microscope to check for cancer cells floating in the peritoneal fluid^[8].

Biopsy: A provider may remove a sample of the tumor and test it in a lab for cancer cells^[2].

Staging laparoscopy: This is a safe, minimally invasive surgical procedure used to look directly inside the abdominal cavity using a small camera. It allows healthcare professionals to inspect the peritoneum, find hidden tumors, and take tissue or fluid samples. This test is especially valuable for finding peritoneal metastases that are too small to be seen with imaging^[8].

Healthcare providers may use the Peritoneal Carcinomatosis Index (PCI) during the diagnostic process to plan treatment. Using this index, providers map the location of the tumor in the abdomen and small intestine and assign a score based on the tumor’s size. This information helps determine how likely it is that surgery can successfully remove the tumor^[2].

Treatment Options

The standard treatment for peritoneal carcinoma metastatic is cytoreductive surgery (CRS) combined with hyperthermic intraperitoneal chemotherapy (HIPEC)^[2][9]. The goal of cytoreductive surgery is to remove all visible tumors in the peritoneum^[2].

During HIPEC, heated chemotherapy is placed directly into the abdomen after the tumors are removed. The treatment typically lasts between 30 and 120 minutes. The heat helps the chemotherapy work better and may destroy any remaining cancer cells that surgery couldn’t remove^[2][9].

While there is no cure for peritoneal carcinoma metastatic, surgery combined with HIPEC helps people with this disease live longer^[2][3]. These treatments can help some people feel better and live longer, and sometimes they may even lead to a cure^[3].

The introduction of these therapeutic methods has significantly improved the life expectancy of patients with peritoneal carcinoma metastatic^[5]. Treatment options should always be considered by the multidisciplinary team for prevention or treatment^[17].