No, not really. IG-SRT is a treatment, not a preventive measure for other skin cancers. It will cure the cancer you have, but it doesn’t change the underlying damage or predisposition in your skin that led to that cancer. The risk of developing new skin cancers in the future is mostly related to factors like past sun exposure, skin type, age, and genetics – those remain the same irrespective of treatment choice. In fact, neither surgery nor IG-SRT reduces the chance of a different skin cancer forming elsewhere; they just remove or kill the existing one.
Some might wonder if radiation “sterilizes” the area around the tumor and thereby prevents new ones right there. While it does kill cells in the treated field (cancerous and some normal), those normal cells that repopulate are still susceptible to damage from UV later. There’s no evidence that treating one spot with radiation protects other nearby skin from ever getting a cancer. Your skin doesn’t become immune to cancer because it had radiation. The statistic that up to 50% of people with one skin cancer get another within 5 years remains true whether you had surgery or radiation for the first one.
One could argue that by removing one cancer you reduce total burden – but the risk for new lesions comes from the entire field of sun-exposed skin harboring precancerous changes. That’s why we emphasize sun protection and regular checks: those measures can help reduce and catch new lesions, but the treatment modality for the first cancer doesn’t affect the incidence of others.
There’s a slight nuance: radiation itself can (in rare cases, decades later) cause new cancers in the same area (like a radiation-induced carcinoma), but that risk is extremely low for superficial radiation and is outweighed by the benefit of curing the current cancer. And at any rate, that’s not a preventive effect, rather the opposite. But as we discussed, it’s <5% over 20-40 years, which is lower than the chance of new ones from sun.
So essentially, IG-SRT doesn’t prevent new cancers – you have to rely on sun protection and vigilant skin surveillance to reduce that risk. Protecting your skin from further UV damage is key to preventing additional skin cancers. Some patients also use chemopreventive measures like niacinamide (Vitamin B3) supplements which studies show can modestly reduce new skin cancer formation, or topical field treatments for precancers, but that’s outside scope here.
In conclusion, the risk of new skin cancers remains the same after IG-SRT as it would have been otherwise, so continue good sun behavior and follow-ups. IG-SRT’s job is to cure the one you have, which it does, but it’s not a vaccine against future ones.
