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Radiation Therapy · Melanoma & Skin Cancer
When Is Radiation Used for Melanoma — And Is It Really Radioresistant?
Medically reviewed by Dr. Venkata Sushma P, Radiation Oncologist, MBBS · MD (Radiation Oncology) · Last reviewed August 2026
Melanoma is treated with surgery first in almost every case. But the line patients still hear — “melanoma does not respond to radiation” — is out of date. Modern schedules give fewer, larger doses, and radiation has clear roles: after certain high-risk surgeries, where an adequate margin would cost appearance or function, and for spread to the brain, bone or spine.
- “Radioresistant” is an outdated label — Melanoma repairs low-dose damage well, so old daily schedules underperformed. Larger doses per session and stereotactic delivery change that — ask which schedule is proposed for you, and why.
- Surgery still leads, and that is not a failing — Radiation does not replace an adequate excision. It is added where the risk of return at that exact spot is high, or where surgery would cost you too much tissue.
- Appearance and limb function are planned for, not promised — Planning aims to protect the joint, the limb and the skin around your scar. No team can promise a particular cosmetic result — ask what is being spared and what is not.
- Delivered at an NABH-accredited partner centre — CION Cancer Clinics does not own or operate a linear accelerator, CyberKnife, Gamma Knife or proton facility. We coordinate your plan, your oncology team and your follow-up throughout.
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The short answer
Is melanoma radioresistant?
No — not in the blanket way the word is used. Melanoma cells repair small amounts of radiation damage efficiently, so the old low-dose-per-day schedules underperformed. Larger doses per session, and stereotactic delivery, behave differently. Radiation is still not the first treatment for most melanoma. Surgery is.
The belief has a real origin. Laboratory work in the 1970s and 1980s found melanoma cell lines surviving small single doses better than most other tumour cells. That observation hardened into a sentence patients still hear in clinic: “radiation does not work on melanoma”. It was a fair reading of the science available then. It is not a fair reading of the science now.
What changed is the schedule, not the cancer. When the dose delivered in each session goes up and the number of sessions comes down — and when the beam is shaped and aimed with stereotactic accuracy — melanoma responds far better than the old label suggests. Guideline bodies including NCCN and ASTRO now set out specific melanoma settings in which radiation is recommended rather than merely permitted.
Being fair to surgery matters just as much. Radiation is an addition, not a substitute. Wide local excision with an adequate margin, with sentinel lymph node assessment where it is indicated, remains the backbone of melanoma treatment. If your surgeon has said “surgery first”, that is standard practice, not an oversight — and a good second opinion should confirm it rather than overturn it.
Your radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. CION does not own or operate a linear accelerator, CyberKnife, Gamma Knife or proton facility, and CION is not itself NABH-accredited.
The situations that actually call for it
When is radiation added for melanoma?
Radiation is added in defined situations, not routinely. It is used after surgery when the risk of the melanoma returning at that exact spot is high, when an adequate margin cannot be taken without costing appearance or function, when disease cannot be removed at all, and to control spread to the brain, bone or spine.
The table below is the framework a multidisciplinary team works through. Read the last column carefully: in almost every row, surgery still leads and radiation follows.
| Situation | What it usually means on your report | What radiation aims to do | Where surgery still leads |
|---|---|---|---|
| After removal of the primary, high local risk | A nerve-invading (desmoplastic or neurotropic) melanoma, often on the head or neck, or a margin that could not be widened | Lower the chance of the melanoma coming back in the same place | The excision itself comes first; radiation is considered only once the specimen has been reported |
| After lymph node surgery, selected patients | Bulky nodes, several involved nodes, or disease grown outside the node capsule in the neck, armpit or groin | Reduce the chance of the disease returning in that node basin | The node dissection is the treatment; radiation is an add-on discussed afterwards |
| Lentigo maligna on the face | A slow, flat, spreading pigmented patch on sun-damaged facial skin, often large and ill-defined | Treat the area when excision would remove a wide field of visible skin, or when surgery is not safe | Excision remains the standard option and is usually offered first |
| In-transit disease or local recurrence that cannot be removed | Nodules in the skin between the original site and the nearest node basin | Control disease locally and relieve symptoms | Surgery is used wherever the deposits can still be excised |
| Spread to the brain | Deposits seen on a brain MRI, with or without headache, weakness or a seizure | Treat each deposit with focused stereotactic radiosurgery, sparing the rest of the brain | Neurosurgery is preferred for a single large deposit causing pressure |
| Spread to bone or spine, or a bleeding skin deposit | Pain, a fracture risk, cord compression, or a deposit that bleeds or breaks down | Relieve pain, stabilise the area and settle bleeding — often in a handful of sessions | Orthopaedic or neurosurgical fixation may be needed first if the bone is unstable |
| Mucosal melanoma | Melanoma arising in the nasal cavity, mouth or anorectal lining, where clear margins are hard to achieve | Improve local control after the most complete surgery possible | Resection is still attempted wherever function allows |
| Where it happens | Surgery, imaging and radiotherapy are all delivered at NABH-accredited partner centres; CION Cancer Clinics coordinates the plan, the team and the care | ||
| Cost pattern (indicative only, as of August 2026) | A short palliative course, a stereotactic session and a longer post-operative course are priced very differently. Ask for a written estimate before you decide, and have your insurance or scheme eligibility checked. | ||
This is a framework, not a recommendation. Where your melanoma started, what the pathology report says about nerves and margins, and what the scans show all change how these rows read for you.
Did you know?
The reputation melanoma has for being “radioresistant” comes from laboratory studies done in the 1970s and 1980s, when radiation was almost always given as many small daily doses. Melanoma cells repair that kind of damage well. Larger doses per session and stereotactic delivery changed the picture, and guideline bodies including NCCN and ASTRO now name specific melanoma settings in which radiation is recommended. Current as of August 2026.
The question families ask first
What about melanoma that has spread to the brain?
Brain spread is where radiation matters most in melanoma. When the number of deposits is limited, stereotactic radiosurgery treats each one in a single session or a few sessions while sparing the rest of the brain. Whole-brain radiation is now used far more selectively. Timing with systemic treatment is decided by the whole team.
Melanoma reaches the brain more often than most cancers, so a brain MRI forms part of staging when the risk is judged high. Finding a deposit early, before it causes symptoms, widens the options — small deposits are exactly the ones stereotactic radiosurgery is designed for.
The choice between focused and whole-brain treatment usually turns on number and size. A limited count of small deposits is generally treated one by one with a focused dose. Where many deposits are present, whole-brain treatment may still be the right answer, and where it is, techniques that spare the memory structures of the brain can be considered to reduce the effect on thinking and recall.
Radiation is rarely the whole plan. Systemic treatment — immunotherapy or targeted therapy, decided by your medical oncologist — often runs alongside it, and the order in which the two are given is a team decision, not something to settle from a search result. Medicines to settle swelling around the deposits are commonly used while treatment takes effect.
Do not wait for the next appointment if there is a new severe headache, repeated vomiting, new weakness in an arm or leg, a seizure, sudden confusion or a change in vision. Call your treating team, or our helpline on 1800 202 8726, the same day, and go to the nearest emergency department if the symptom is severe.
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Ask what your own report actually calls for
A radiation oncologist can read the margins, the nerve findings and the node results with you, and say plainly whether radiation adds anything. Free, confidential, no commitment.
Start to finish
What does a course of radiation for melanoma actually involve?
A typical pathway at an NABH-accredited partner centre. A single stereotactic session and a several-week post-operative course differ only at step five.
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The pathology report is read line by line
Thickness, ulceration, margin width, nerve involvement and the node findings decide whether radiation adds anything at all. If those details are missing, they are requested before anything is planned.
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The joint decision
A surgical oncologist, a medical oncologist and a radiation oncologist look at the same report and scans. You should leave that meeting knowing why radiation was advised, or why it was not.
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Timing against surgery and systemic treatment
The wound needs to have healed enough before the beam crosses it, and systemic treatment has to be sequenced around it. Getting this order right is a large part of what coordination means.
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Marking, immobilisation and the planning scan
A mask for a head or neck site, or a cast or cushion for a limb, holds you in the same position every day. A planning CT is taken in that position. Nothing is treated on this visit.
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Building the plan
A physicist and your radiation oncologist shape the dose to the area at risk while pulling it away from the joint, the healthy skin, the lung, the bowel or the brain, depending on the site. This takes days, not minutes.
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The treatment sessions
You lie still and the machine moves around you. There is nothing to feel and no pain during delivery. You are not radioactive afterwards and it is safe to be around children and pregnant family members.
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Skin, limb and follow-up care
Skin is reviewed weekly during the course. Physiotherapy and limb measurements start early where an armpit or groin is treated. Follow-up then combines skin checks, scans and reviews for years.
Appearance and limb function
What will radiation do to my skin, my scar and my limb?
There will be visible change in the treated area, and no team can promise a particular cosmetic result. Skin usually reddens or darkens during the course and settles over weeks. Firmness, colour change and hair loss in the treated patch can persist. Swelling and stiffness are the risks worth planning for.
This is the part of the conversation that is often rushed, and it is the part that decides how you feel about the decision a year later. Ask for it in detail, and ask for it before you consent.
- During the course — the skin over the treated area reddens or darkens, dries and can become sore. Your team will advise on washing, moisturising and what to avoid.
- Hair in the treated area — usually lost within the field, and regrowth is not certain. Only the treated patch is affected, not your whole scalp or body.
- Months later — the skin can stay firmer, darker or paler than the skin beside it, and small surface blood vessels may become visible. This is expected, not a complication.
- Swelling of an arm or leg — a real risk when an armpit or groin is treated after node surgery. Early measurement, a fitted garment and specialist advice reduce it.
- Joint stiffness — if the field crosses a shoulder, hip or knee, movement can tighten over months. Physiotherapy started during treatment, not after, protects range of movement.
- Wound healing — radiation given too soon after surgery can slow a wound. This is exactly why the timing between the operation and the first session is planned, not assumed.
Tell your team about a wound that opens or leaks, skin that breaks down, a limb that swells suddenly or a joint that will not straighten. Call 1800 202 8726 if you cannot reach your treating centre the same day.
Bring these to your consult
Seven questions to ask before you agree to radiation
Each one turns “we may add radiation” into a plan you can actually weigh.
- What exactly on my report puts me in this group? — margin, nerve involvement, node capsule, number of nodes. Ask to be shown the line.
- Is more surgery an option instead? — sometimes a re-excision is the better answer, and it should be offered fairly rather than skipped.
- How many sessions, and what dose per session? — melanoma schedules vary a great deal, and there should be a reason specific to your site.
- What is in the field, and what is being spared? — the joint, the healthy skin, the lung, the bowel or the brain, depending on where you are treated.
- What is the realistic effect on how this area will look and move? — ask for the honest version, including swelling and stiffness risk.
- How does this fit with my systemic treatment? — sequencing is a team decision and should be explained to you, not left implied.
- What is the indicative cost, and is it covered? — costs are indicative only, as of August 2026. Get a written estimate and have your scheme or insurance checked.
Prefer to ask these out loud? Call 1800 202 8726 and we will book a free consultation with a radiation oncologist.
Outdated advice costs options
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Families arrive certain that radiation has nothing to offer in melanoma, and leave understanding exactly where it does and where it does not. Ask before you decide.
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Common questions
Radiation for melanoma — your questions answered
Is melanoma radioresistant?
Not in the blanket way that word is usually used. Laboratory work from the 1970s and 1980s showed melanoma cells repairing small doses of radiation well, and that hardened into the belief that radiation does nothing for melanoma. Radiobiology has moved on. Melanoma responds better when the dose given in each session is larger, and when the beam is delivered with stereotactic precision. Guideline bodies including NCCN and ASTRO now list specific melanoma situations in which radiation is recommended. What remains true is that radiation is not the primary treatment for most melanoma. Surgery is, and radiation is added where it changes something.
When is radiation added after melanoma surgery?
Radiation is considered when the chance of the melanoma returning at that exact site is high and more surgery is not the answer. Common examples are a nerve invading melanoma on the head or neck, a margin that could not be widened without taking too much tissue, and lymph node surgery where the nodes were bulky, where several were involved, or where the disease had grown outside the node capsule. It is a discussion, not an automatic step. Your surgeon, radiation oncologist and pathologist should agree on the reason before it is offered, and that reason should come from your own report.
Can radiation replace surgery for melanoma?
In most cases it does not, and it should not be presented that way. Removing the melanoma with an adequate margin is the backbone of treatment, and a surgeon who advises surgery first is following standard guidance. Radiation is used instead of surgery in specific circumstances: a large lentigo maligna on the face where excision would remove a wide area of visible skin, a patient who cannot safely undergo an operation, or disease that cannot be removed completely. Those are exceptions with a stated reason. Ask what the reason is in your case, and what is being traded away.
What is done for melanoma that has spread to the brain?
Brain spread is where radiation matters most in melanoma. When there are a limited number of deposits, stereotactic radiosurgery treats each one in a single session or a few sessions while sparing the rest of the brain. Whole brain radiation is used more selectively than it once was, and where it is needed, techniques that spare the memory structures may be considered. Medicines to settle the swelling around the deposits are often used alongside. Systemic treatment is usually part of the plan too, and the order of the two is decided by the team. Report a new severe headache, vomiting, weakness, a seizure or confusion the same day.
Will radiation change how my skin and my limb look and work?
There will be changes in the treated area, and no team can promise a particular cosmetic result. During the course the skin usually reddens or darkens and may become dry or sore, and hair in the treated area is often lost. Over months the skin can stay firmer, darker or paler than the skin beside it. If the treated area includes an armpit or a groin, swelling of the arm or leg becomes a real risk. If it crosses a joint, stiffness can follow. Planning aims to limit all of this, and physiotherapy started early makes a measurable difference to how a limb moves afterwards.
Where is radiation for melanoma delivered, and what does it cost?
CION Cancer Clinics does not own or operate a linear accelerator, CyberKnife, Gamma Knife or proton facility, and CION is not itself NABH-accredited. Your radiotherapy is delivered at an NABH-accredited partner centre. CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout, including the scans, the surgical review and the follow up. Costs are indicative only, as of August 2026, and depend on the technique, the number of sessions and the delivering centre, so a single number is not meaningful. Ask for a written estimate, and let our team check your insurance or scheme eligibility before you commit.
This page explains when radiation therapy is used for melanoma in general terms. It is not a substitute for guidance from your own surgical, medical and radiation oncology team about your melanoma, your pathology report and your scans.