Understanding Radiation Therapy for Melanoma
Radiation therapy uses carefully directed high-energy radiation to damage cancer cells and help control tumors within a specific treatment area. Although surgery is the primary treatment for most localized melanomas, radiation may be recommended in selected situations, including when surgery is not feasible, when the risk of local recurrence is significant, or when melanoma has spread to other parts of the body.
At Saint John’s Health Center, radiation services are provided through the Vasek Polak Radiation Oncology Department. Radiation oncologists collaborate with melanoma specialists, including surgical oncologists, medical oncologists, radiologists, and pathologists, to determine when radiation may contribute to an individualized treatment plan.
Drawing on the clinical resources of Saint John’s Cancer Institute and the radiation treatment capabilities of Vasek Polak Radiation Oncology, our care teams consider the benefits of local treatment alongside surgery, immunotherapy, targeted therapy, and the patient’s overall health and treatment goals.
How Radiation Therapy Works Against Cancer Cells
Radiation therapy works primarily by damaging DNA inside cancer cells. When sufficient damage occurs, the cells may lose their ability to divide and eventually die. Radiation can also affect nearby healthy tissues, which is why treatment planning seeks to concentrate the prescribed dose within the intended target while limiting unnecessary exposure elsewhere.
Most melanoma radiation treatments use external beam techniques, in which radiation is delivered from equipment outside the body. Imaging studies help clinicians define the treatment area, select the radiation dose, and account for nearby organs and sensitive structures.
Radiation is considered a local treatment because it is directed toward a defined anatomical area. This differs from systemic treatments such as immunotherapy and targeted therapy, which may act on cancer throughout the body.
When May Radiation Therapy Be Recommended?
Radiation therapy is not routinely required for most patients with melanoma that can be removed completely through surgery. Its role depends on the melanoma’s location, stage, pathology findings, previous treatment, and the potential benefits of controlling cancer within a particular area.
Selected situations where radiation may be considered include:
- After Surgery: To reduce the risk of cancer returning in a particular area when pathological findings suggest a significant local recurrence risk.
- When Surgery Is Not Feasible: To treat selected tumors that cannot be safely or completely removed.
- Regional Lymph Node Disease: To improve control within an involved lymph node region for certain high-risk patients.
- Recurrent Melanoma: To address selected sites where melanoma has returned.
- Metastatic Melanoma: To control certain tumors in the brain, bones, spine, or other locations, or to relieve symptoms caused by cancer.
Radiation may be delivered alone or coordinated with surgery and systemic therapy. Treatment selection depends on whether the principal goal is local disease control, reducing recurrence risk, or relieving symptoms.
Radiation Treatment Methods for Melanoma
Modern radiation oncology uses imaging, computerized treatment planning, and specialized delivery techniques to concentrate radiation within the prescribed treatment area. The method selected depends on the melanoma’s location, size, proximity to sensitive structures, and the goal of treatment. Not every technique is appropriate for every melanoma.
External Beam Radiation Therapy
External beam radiation therapy directs radiation toward cancer from a machine outside the body. Treatment is planned using imaging to define the tumor or affected region and to limit exposure to nearby healthy tissues as much as possible.
Techniques such as intensity-modulated radiation therapy (IMRT), image-guided radiation therapy (IGRT), and volumetric modulated arc therapy (VMAT) allow radiation oncologists to shape and deliver the prescribed dose according to the treatment area’s anatomy. The choice of technique depends on the clinical situation and the tissues that need protection.
At Vasek Polak Radiation Oncology, treatment planning involves radiation oncologists, medical physicists, dosimetrists, radiation therapists, and nursing specialists who coordinate the preparation and delivery of care.
Stereotactic Radiosurgery and Stereotactic Body Radiation Therapy
Stereotactic radiosurgery (SRS) delivers precisely focused radiation to selected targets, commonly including melanoma metastases in the brain. Despite its name, SRS does not involve a surgical incision. Depending on the tumor and its location, treatment may be delivered in one session or several carefully planned sessions.
Stereotactic body radiation therapy (SBRT) uses a related approach for selected tumors outside the brain. It may be considered for certain limited metastatic sites or other situations where highly focused radiation is appropriate.
For patients with melanoma involving the brain, the decision to use SRS, surgery, systemic therapy, or another approach depends on the number, size, location, and symptoms of the metastases, along with overall disease control. These treatments may be coordinated with immunotherapy or other systemic treatment when clinically appropriate.
Radiation After Melanoma Surgery
Radiation may be considered after surgery when the risk of cancer returning within the original treatment area is substantial. Selected melanomas involving nerves, difficult surgical margins, or particular histologic features may require additional consideration.
Desmoplastic melanoma is one subtype in which radiation may be considered after surgery, particularly when there are concerns about local recurrence. The decision depends on tumor characteristics, surgical findings, and the balance between potential benefit and treatment-related effects.
For selected patients who have undergone therapeutic removal of regional lymph nodes, radiation may reduce the likelihood of melanoma returning within the treated lymph node region. However, studies have not demonstrated an overall-survival improvement from routine postoperative nodal radiation, and treatment can increase the risk of complications such as lymphedema.
Learn more about Completion Lymph Node Dissection and how regional disease may be evaluated and treated.
Superficial Radiation Therapy and Skin Cancer
Superficial radiation therapy (SRT) uses relatively low-energy X-rays to treat selected conditions close to the skin surface. It is used primarily for certain nonmelanoma skin cancers, including basal cell carcinoma and squamous cell carcinoma, when radiation is an appropriate treatment choice.
Superficial radiation is not a routine treatment for invasive melanoma, which may extend into deeper tissues or require different approaches to local and systemic disease control. The appropriate radiation technique must account for tumor depth, location, and the treatment objective.
The Vasek Polak Radiation Oncology Department provides superficial radiation therapy as part of its broader radiotherapy services. Patients can learn more about the department’s treatment technologies and how different techniques are selected for particular conditions.
Palliative Radiation for Advanced Melanoma
For patients with advanced melanoma, radiation can help relieve symptoms caused by cancer at specific sites. This is called palliative radiation therapy, and it may be used to reduce pain, control bleeding, or treat a tumor placing pressure on nearby nerves or other structures.
Examples include painful bone metastases, certain brain metastases, or tumors involving the spine. In urgent situations, such as suspected spinal cord compression, prompt evaluation is particularly important.
Palliative radiation can be provided alongside other cancer treatments and supportive care. Although it does not necessarily eliminate cancer throughout the body, it may improve comfort, function, or control of an individual troublesome tumor.
What to Expect During Radiation Therapy
Radiation therapy begins with an evaluation by a radiation oncologist, followed by treatment planning tailored to the cancer’s location and the patient’s needs. The number of sessions, the radiation dose, and the type of treatment vary according to the goal of care. Understanding the process and potential side effects can help patients prepare for treatment and recovery.
Consultation, Simulation, and Treatment Planning
Before treatment, the radiation oncologist reviews the diagnosis, pathology, prior treatments, imaging studies, and relevant medical history. The physician discusses the proposed treatment area, anticipated benefits, possible side effects, and how radiation fits within the overall melanoma care plan.
When external beam treatment is recommended, a planning session called simulation is commonly performed. CT imaging and positioning devices may be used to help reproduce the patient’s position during each treatment and define the area requiring radiation.
Radiation oncologists work with medical physicists, dosimetrists, and radiation therapists to develop and verify the treatment plan before radiation is delivered.
How Long Does Radiation Treatment Take?
Most external beam radiation treatments are delivered on an outpatient basis. Depending on the treatment method and clinical situation, a course may involve a single session, several treatments, or repeated visits over a number of weeks.
The radiation delivery itself is generally painless. Patients may spend additional time being positioned and having alignment images obtained before treatment. The care team will explain the schedule, expected appointment length, and any instructions specific to the treated area.
Possible Side Effects of Radiation Therapy
Side effects depend on the part of the body receiving radiation, the prescribed dose, the number of treatments, and whether other cancer therapies are being used. Some effects develop during treatment or shortly afterward, while others may occur months or years later.
Possible side effects include:
- Skin Changes: Redness, irritation, dryness, peeling, or tenderness in the treated area.
- Fatigue: Reduced energy that may develop or increase during a course of treatment.
- Hair Loss in the Treatment Area: Temporary or lasting hair loss, depending on dose and location.
- Head and Neck Symptoms: Mouth or throat irritation and swallowing discomfort when relevant tissues are treated.
- Swelling and Tissue Changes: Fluid accumulation, stiffness, fibrosis, or reduced mobility after certain treatments.
- Site-Specific Effects: Symptoms affecting nearby organs or tissues, depending on the radiation target.
Radiation involving the brain, spine, or other sensitive structures has additional risks that require individualized discussion. Modern treatment planning seeks to limit exposure to healthy tissues, but it cannot eliminate every possible side effect.
Patients receiving radiation and immunotherapy may require additional monitoring because treatment-related effects can overlap or interact.
Managing Side Effects and Daily Activities
Many patients can continue at least some routine activities during radiation therapy, although fatigue and other symptoms may affect work, exercise, or daily responsibilities. The impact varies with the treatment area, schedule, and individual health.
Patients should follow their radiation oncology team’s instructions about skin care, medications, activity, and symptoms that require evaluation. Gentle skin care and appropriate supportive treatments may help manage irritation and other effects.
New or worsening symptoms, including severe pain, neurological changes, difficulty breathing, or unexpected swelling, should be reported promptly. Sudden severe neurological symptoms or other medical emergencies require immediate evaluation.
Frequently Asked Questions About Melanoma Radiation Therapy
Can radiation therapy cure melanoma?
Radiation may provide definitive local treatment in selected circumstances when surgery is not feasible, but it is not the usual primary treatment for most localized cutaneous melanomas. Its role depends on the stage, location, treatment goal, and other available therapies.
Will I need radiation after melanoma surgery?
Most patients do not require postoperative radiation. It may be considered when certain pathology findings or anatomical factors indicate a substantial risk of local recurrence.
Can radiation be combined with immunotherapy?
Yes. Radiation and immunotherapy may be coordinated for selected patients with advanced melanoma. The schedule and safety considerations depend on the treatment sites, medications, and overall clinical plan.
How will my care team know whether radiation worked?
Evaluation may include clinical examination, imaging, symptom review, and follow-up with the treating specialists. The appropriate method depends on whether radiation was intended to control visible disease, reduce recurrence risk, or relieve symptoms.
Get Answers About Radiation Therapy for Melanoma
When radiation therapy is recommended for melanoma, understanding its purpose is an important part of making informed treatment decisions. Whether radiation is being considered after surgery, for recurrent disease, or to treat a specific metastatic site, the expected benefits and potential risks should be evaluated in the context of your overall care.
At Saint John’s Health Center, the Vasek Polak Radiation Oncology Department works with specialists from Saint John’s Cancer Institute to develop individualized treatment recommendations and coordinate care when radiation therapy is appropriate.
If you have questions regarding the radiation treatment for melanoma, please call today or click here to schedule an appointment or for an expert second opinion.
