Key Takeaways:
- Radiotherapy is a genuine treatment option for basal cell carcinoma and squamous cell carcinoma, but UK guidance reserves it mainly for patients who can’t or don’t want surgery, not as a routine first choice.
- It’s generally recommended for patients aged 60 and over, since radiation-related side effects can take years to appear and surgery remains preferable for younger patients where both are suitable.
- A course typically means daily sessions on weekdays for one to six weeks, compared with surgery’s single appointment (plus any reconstruction).
- UK guidelines specifically advise against radiotherapy on the lower legs, where poor blood supply makes healing unreliable, and in patients under 60 or with certain genetic conditions.
For most people diagnosed with basal cell carcinoma (BCC) or squamous cell carcinoma (SCC), surgery is the first option discussed, and for good reason: it has the highest cure rates and gives an immediate answer on whether the margins are clear. But radiotherapy is a real, guideline-backed alternative, not a fallback used only when nothing else will do.
The honest answer to which one is right for you depends heavily on your age, the tumour’s location and subtype, and whether you’re a good candidate for surgery in the first place. Skin Cancer Treatment & Surgery sets out the full range of options Miss Rakhee Nayar discusses with patients; this article focuses specifically on how radiotherapy and surgery compare.
When radiotherapy is recommended instead of surgery
According to Cancer Research UK’s guidance on radiotherapy for non-melanoma skin cancer, it’s typically offered when surgery isn’t possible because a patient isn’t fit enough for an operation, doesn’t want one, or the tumour sits somewhere that would make surgical removal difficult without significantly affecting appearance or function.
It’s also used after surgery in some cases, as an additional treatment to reduce the risk of the cancer coming back, and where a tumour has spread beyond the original site.
When radiotherapy is not recommended
The British Association of Dermatologists’ 2021 guideline for managing basal cell carcinoma is specific about who radiotherapy suits, and who it doesn’t. It’s generally reserved for patients aged 60 or over, because the late effects of radiation, changes to the skin that can take years to develop, matter less over a shorter remaining lifespan than they would for someone younger.
The same guideline advises against radiotherapy in several specific situations:
- Where the cancer has already recurred after a previous course of radiotherapy
- In patients with Gorlin syndrome or xeroderma pigmentosum, genetic conditions that increase sensitivity to radiation
- On the lower legs, where blood supply is often poor enough that radiotherapy wounds don’t heal reliably
- Where the cancer has grown into bone or cartilage
That last point about blood supply is worth understanding on its own terms, since it affects how well any wound heals, not just a radiotherapy one. Mohs surgery compared with standard excision goes into more detail on how site and blood supply influence which surgical technique makes sense too.
What a course of radiotherapy actually involves
Unlike surgery, which is usually done in a single visit (occasionally staged over a few appointments), radiotherapy is delivered in repeated small doses. Most patients attend once a day, Monday to Friday, for anywhere between one and six weeks, depending on the tumour and the treatment plan.
Older or frailer patients sometimes have a less frequent schedule, weekly or two to three times a week, and some straightforward cases are treated in a single session. Most non-melanoma skin cancer is treated with superficial radiotherapy, using low-energy x-rays or electrons aimed specifically at the skin’s surface layers.
How surgery and radiotherapy compare
| Factor | Surgery (Mohs or standard excision) | Radiotherapy |
|---|---|---|
| Typical time commitment | Usually a single appointment | Daily sessions over one to six weeks |
| Confirmation of clearance | Margins checked before you leave (Mohs) or shortly after (standard excision) | No tissue margin to check; success is judged by follow-up examination over time |
| Best suited to | Most patients who are fit for a local anaesthetic procedure | Patients aged 60+ who can’t or don’t want surgery, or certain tumours near critical structures |
| Cosmetic outcome | Wound is closed or reconstructed straight away | Skin in the treated area can change texture and colour over time |
| Not generally suitable for | Patients unfit for any procedure | Under-60s, lower legs, recurrent post-radiotherapy tumours, bone or cartilage involvement |
Why surgery is usually preferred where both are genuinely suitable
Neither the Cancer Research UK guidance nor the BAD guideline positions radiotherapy as equivalent to surgery for patients who are good surgical candidates. Surgery remains the first-line treatment for most BCC and SCC, partly because it gives a definitive, immediate answer on clearance, something radiotherapy can’t offer in the same way.
Mohs micrographic surgery in particular is built around that certainty: tissue is checked under the microscope during the procedure itself, so the surgery isn’t finished until the margins are confirmed clear. For tumours in cosmetically or functionally sensitive areas, that precision also means less healthy tissue is removed than a standard excision would take.
Side effects to expect with each approach
Radiotherapy’s side effects tend to build up gradually over the treatment course rather than arrive all at once. Cancer Research UK lists soreness, dryness and itching of the treated skin, crusting or scabbing, occasional bleeding, a higher risk of infection, and lasting sun sensitivity in the treated area as the main ones. Hair loss in the treated area can be permanent.
Surgical side effects are different in kind: a single wound to manage rather than a course of skin reactions, with a recovery period that’s usually measured in weeks rather than the months some radiotherapy skin changes can take to settle. Scarring after Mohs surgery covers what that recovery typically looks like.
Miss Rakhee Nayar, a Consultant Plastic Surgeon and Mohs Micrographic Surgeon, discusses both pathways with patients where radiotherapy is genuinely an option, so the decision reflects your own circumstances rather than a default. Get in touch through the contact page to talk through what applies to your case.
FAQ
Is radiotherapy as effective as surgery for skin cancer?
Neither UK guidance body positions the two as interchangeable. Surgery remains the preferred first-line treatment for most patients who are fit for it, largely because it confirms clearance immediately. Radiotherapy is a genuine, guideline-backed option, but mainly for patients who can’t or don’t want surgery.
Why is radiotherapy usually only offered to people over 60?
Radiation can cause skin changes that take years to develop. For an older patient, that long-term risk matters less than it would for someone likely to live with the treated area for decades afterwards, which is why UK guidelines generally reserve it for patients aged 60 and over.
Can radiotherapy be used on the legs?
It’s generally advised against on the lower legs specifically. Blood supply there is often poor enough that radiotherapy wounds don’t heal reliably, so surgery is usually the better option for tumours in that location.
How long does a radiotherapy course for skin cancer take?
Most courses run daily on weekdays for one to six weeks, depending on the tumour and treatment plan. Some older or frailer patients have a less frequent schedule, and some straightforward cases need only a single session.
Does radiotherapy leave a scar like surgery does?
Not in the same way. There’s no surgical wound, but the treated skin can change in texture and colour over time, and this can take months to fully settle.
Recommended
- Skin Cancer Treatment & Surgery
- What is Mohs Micrographic Surgery?
- Skin Cancer Creams vs Surgery: When Is Topical Treatment Enough?
Filed under Choosing Your Care
