Radiation Therapy: How It Works, Types & Side Effects
Radiation therapy is a medical treatment that uses high-energy ionizing radiation to destroy cancer cells or inhibit their growth, and is one of the most important tools in oncology.
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Radiation therapy is a medical treatment that uses high-energy ionizing radiation to destroy cancer cells or inhibit their growth, and is one of the most important tools in oncology.
What Is Radiation Therapy?
Radiation therapy (also called radiotherapy) is one of the most widely used treatments in modern oncology. It uses high-energy ionizing radiation to damage or destroy cancer cells by preventing them from dividing and growing. The radiation is carefully directed at the tumor site to minimize harm to the surrounding healthy tissue. Radiation therapy can be used alone or in combination with surgery and chemotherapy, depending on the type and stage of cancer.
Mechanism of Action
Ionizing radiation works by damaging the DNA inside cancer cells. This damage prevents the cells from replicating and ultimately causes them to die. Cancer cells are generally more sensitive to radiation than healthy cells because they divide more rapidly and have a reduced ability to repair DNA damage. Treatment is typically divided into multiple small doses called fractions, allowing healthy surrounding tissue to recover between sessions.
Indications
Radiation therapy is used to treat a wide range of cancers, including:
- Breast cancer
- Prostate cancer
- Lung cancer
- Colorectal cancer
- Head and neck cancers
- Brain tumors
- Lymphomas
- Leukemia (in the context of stem cell transplantation)
In addition to curative intent, radiation therapy can also be used palliatively -- for example, to relieve pain caused by bone metastases -- without aiming for a complete cure.
Types of Radiation Therapy
External Beam Radiation Therapy
In external beam radiation therapy, radiation is delivered from a machine outside the body and directed precisely at the tumor. Modern techniques such as intensity-modulated radiation therapy (IMRT), stereotactic radiosurgery, and proton therapy allow for highly precise dose delivery that maximizes tumor exposure while protecting surrounding healthy structures.
Brachytherapy (Internal Radiation)
Brachytherapy involves placing radioactive sources directly inside or next to the tumor. This approach is commonly used for prostate cancer, cervical cancer, and breast cancer. It allows a high radiation dose to be delivered locally with minimal impact on surrounding tissues.
Systemic Radiation Therapy
Systemic radiation therapy involves the intravenous administration of radioactive substances that selectively accumulate in tumor tissue. A well-known example is radioiodine therapy (I-131) for thyroid cancer, in which radioactive iodine is absorbed by thyroid cells and destroys them from within.
Treatment Process
Before treatment begins, a detailed radiation planning process takes place. Using computed tomography (CT) or magnetic resonance imaging (MRI), the tumor is precisely localized and the treatment field is defined. The actual radiation sessions are painless and typically last only a few minutes each. Depending on the diagnosis and treatment goals, multiple sessions are scheduled over several weeks.
Side Effects
Radiation therapy can cause side effects, which are classified as acute (occurring during or shortly after treatment) or chronic (late effects appearing months or years later). Common acute side effects include:
- Fatigue and exhaustion
- Skin redness or irritation in the treated area
- Mucositis (inflammation of mucous membranes, e.g., in the mouth or intestines)
- Nausea (depending on the area being treated)
- Hair loss in the irradiated region
Potential long-term effects depend on the treatment area and may include tissue fibrosis (scarring), hormonal changes, or a slightly increased risk of secondary tumors.
Combination with Other Therapies
Radiation therapy is frequently combined with other oncological treatments. Chemoradiation combines radiotherapy with chemotherapy to enhance the effectiveness of both modalities. Combinations with immunotherapy and targeted therapies are increasingly being studied in clinical trials, showing promising results in various cancer types.
References
- World Health Organization (WHO): Cancer - Radiotherapy. Available at: www.who.int
- Perez CA, Brady LW, Halperin EC: Principles and Practice of Radiation Oncology. 6th edition. Lippincott Williams & Wilkins, 2013.
- National Cancer Institute (NCI): Radiation Therapy to Treat Cancer. Available at: www.cancer.gov
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Related search terms: Radiation Therapy + Radiation Treatment + Radiotherapy + Radiation Oncology