Radiation Therapy for Mesothelioma: External Beam Radiation

Mesothelioma is a rare cancer that develops in the thin layer of tissue surrounding the lungs, abdomen, or heart. It is most often caused by exposure to asbestos fibers. For Missouri residents who worked in construction, manufacturing, or the state's historic mining and milling operations, asbestos exposure remains a serious concern. Among the treatment options available, external beam radiation therapy is one of the most commonly used approaches to manage the disease.

What Is External Beam Radiation Therapy?

External beam radiation therapy (EBRT) uses a machine outside the body to direct high-energy X-rays or protons at a tumor. The radiation damages the DNA of cancer cells, preventing them from dividing and growing. Unlike internal radiation therapy, which places radioactive material inside the body, EBRT delivers treatment from an external source in a series of sessions.

For mesothelioma, EBRT is rarely used as a standalone cure. Instead, it is typically combined with surgery and chemotherapy as part of a multimodal treatment plan. The goal depends on the stage of the disease and the patient's overall health.

How EBRT Is Used for Mesothelioma

Radiation therapy serves several distinct purposes in mesothelioma care:

• Adjuvant therapy: After surgery to remove visible tumors, radiation is directed at the surgical site to eliminate any remaining microscopic cancer cells. This approach is often used after an extrapleural pneumonectomy or pleurectomy with decortication.
• Neoadjuvant therapy: Radiation may be given before surgery to shrink tumors and make them easier to remove.
• Palliative therapy: When the cancer is advanced, radiation can relieve symptoms such as chest pain, shortness of breath, or difficulty swallowing by shrinking tumors that press on nearby structures.
• Prophylactic therapy: In some cases, radiation is applied to biopsy or surgical incision sites to prevent the tumor from spreading along the track where a needle or instrument entered the body.

What to Expect During Treatment

Before treatment begins, a radiation oncologist performs a planning session called a simulation. During this session, imaging scans such as CT or MRI are used to map the exact location and shape of the tumor. Marks may be placed on the skin to ensure the radiation is aimed at the same spot each time.

Treatment is typically given five days a week for several weeks. Each session lasts only a few minutes, though setup time is longer. The procedure itself is painless. Patients lie still on a table while the machine rotates around them, delivering precise doses of radiation.

Modern techniques, such as intensity-modulated radiation therapy (IMRT) and image-guided radiation therapy (IGRT), allow doctors to shape the radiation beam to match the tumor while sparing healthy tissue. This is especially important for mesothelioma, because the tumor often wraps around the lung and sits close to the heart, esophagus, and spinal cord.

Possible Side Effects

Side effects vary depending on the dose and the area being treated. Common effects include fatigue, skin irritation at the treatment site, and nausea. Because the radiation field may include part of the lung, patients can also experience shortness of breath or a dry cough. Radiation to the chest can irritate the esophagus, causing difficulty swallowing. Most side effects are temporary and can be managed with medication or lifestyle adjustments.

More serious risks include radiation pneumonitis, an inflammation of lung tissue, and damage to the heart or other nearby organs. These risks are reduced with careful treatment planning and modern delivery techniques.

Radiation Therapy in Missouri

Missouri residents have access to several cancer centers that offer advanced radiation therapy for mesothelioma. Academic medical centers in St. Louis and Kansas City provide multidisciplinary care, meaning patients can see surgeons, medical oncologists, and radiation oncologists who work together as a team. Patients should ask their care team about the specific radiation technology available at their treatment center and how it compares to other options.

Because mesothelioma is a complex disease, treatment decisions should be made in consultation with specialists who have experience with this specific cancer. A radiation oncologist can explain the potential benefits and risks of EBRT in the context of a patient's individual diagnosis, stage, and overall health.

For those facing a mesothelioma diagnosis, understanding the role of external beam radiation can help in making informed decisions about care. While radiation is not a cure on its own, it remains a valuable tool for controlling the disease and improving quality of life.

This page is for general informational purposes only and is not legal or medical advice. Reading it does not create an attorney-client relationship. Consult a licensed attorney or physician about your specific situation.