Understanding Radiation Therapy: A Guide for Patients and Families

If you or a loved one has been diagnosed with cancer, you're likely exploring different treatment options. One of the most common and effective tools used to fight cancer is radiation therapy, also called radiation treatment or radiotherapy. But what exactly is it, and how does it fit into a treatment plan?

In this blog, we'll walk you through what radiation therapy is, how it works, when it's used and what to expect — from types to side effects and outcomes.

What is Radiation Therapy?

Radiation therapy uses high-energy particles or waves (like X-rays, protons or radioactive materials) to target and destroy cancer cells. It's a local, precise treatment, meaning it works on a specific part of the body where the cancer is located.

Radiation is a core part of many cancer treatment plans. Surgery physically removes tumors, while radiation therapy helps shrink or destroy cancer cells, often improving treatment outcomes. About 60% of all cancer patients are treated with radiation at some point during their treatment.

Radiation is usually delivered in small daily doses (called fractions) to maximize damage to cancer cells while allowing healthy tissues to recover.

When is Radiation Therapy Used?

Treatment decisions are typically made by a multidisciplinary team including oncologists, surgeons, and radiologists.

Radiation can be used on its own or alongside surgery and chemotherapy, depending on the type and stage of your cancer. Radiation can be used:

• Before surgery, to shrink tumors.
• After surgery, to kill remaining cancer cells.
• Instead of surgery, when surgery isn't an option.
• To relieve symptoms in advanced cases.

What is the Goal of Radiation Therapy?

The goals can vary, depending on your cancer type and stage, but typically include:

• Local control – destroying or shrinking the tumor in one specific area.
• Cure or long-term remission, either alone or in combination with surgery.
• Organ preservation, especially in cases like breast, bladder, rectal or head and neck cancers.
• Palliative care – easing symptoms like pain, bleeding or pressure caused by tumors.

Types of Radiation Therapy

There are several types of radiation therapy, each chosen based on your specific cancer and location in the body:

• External Beam Radiation Therapy (EBRT): A machine delivers radiation from outside the body. This includes advanced techniques such as IMRT, IGRT, SBRT, and proton therapy.
• Brachytherapy (Internal Radiation): Radioactive sources ("seeds") are placed inside or near the tumor.
• Systemic Radiation Therapy: Radioactive substances (e.g., radioactive iodine, Lutetium-177) are given orally or via injection to treat cancer throughout the body.

How Effective is Radiation Therapy?

Radiation is a powerful tool in the fight against cancer. It can:

• Can be curative in selected cancers, either alone or in combination with other treatments.
• Enhance outcomes when combined with surgery or chemotherapy.
• Prevent recurrence by targeting any leftover cancer cells.
• Improve quality of life by reducing symptoms.

Its effectiveness depends on the type, size and location of the tumor, or whether it's used alone or with other treatments.

What are the Outcomes?

Radiation therapy is one of the most carefully studied and widely used cancer treatments in the world. Many patients go on to live full, active lives — either cancer-free or with well-managed disease.

Radiation therapy is carefully planned using imaging and computer-based techniques to ensure maximum tumor control with minimal damage to surrounding normal tissues.

Your doctor will discuss your personalized goals and what success looks like for your unique case, whether that's curing the cancer, prolonging life or improving comfort.

Final Thoughts: What to Ask Your Care Team

If you're considering radiation therapy, here are a few questions you may want to ask:

• What type of radiation will I receive?
• What are the goals of this treatment?
• How many treatments will I need?
• What side effects should I expect?
• How will this fit into my overall treatment plan?

Radiation therapy is a proven, carefully planned treatment that can be a powerful part of your cancer care.