Yes, definitely. If you develop a new basal cell or squamous cell carcinoma in the future, IG-SRT can absolutely be used again to treat that new lesion (assuming it’s appropriate for that lesion). There’s no limit like “one time only per patient.” The limitation is only per site regarding re-irradiation, as we discussed. But a new cancer on a different site is a fresh scenario – you can treat it with IG-SRT just like the first one, and expect similarly high cure rates.
Many patients, particularly those with a tendency to get multiple skin cancers (due to extensive sun exposure history or fair skin, etc.), end up using IG-SRT for multiple lesions over the years. For instance, they might treat a nose BCC now, then two years later treat an ear SCC with IG-SRT, etc. Each lesion is evaluated on its own merits (size, location, etc.), and if IG-SRT is a good fit and the patient prefers it, we will go ahead.
One thing to consider is that if new lesions are very near a previously radiated area, we will ensure we don’t overlap fields significantly with the prior one, or if we must overlap, we calculate the combined dose to stay within safe limits. But often new lesions crop up at distinct spots (say, previously nose, now cheek – they might be a few cm apart, so it’s fine). If a new lesion is adjacent to an old one’s field, we can often still treat by encompassing both or by carefully partial overlapping – a radiation oncologist can help plan that if needed. We just have to be mindful of cumulative dose to any one area of normal skin.
But basically, IG-SRT can be repeated for different lesions in the same patient. In fact, some patients who have multiple skin cancers opt to treat several with IG-SRT concurrently (up to 3 at one time), or sequentially in back-to-back courses. There’s no systemic toxicity building up, so doing multiple is fine aside from the time commitment.
It’s quite analogous to surgery: just like you can have Mohs multiple times in your life on different spots, you can have IG-SRT multiple times on different spots.
So if in, say, two years you get another BCC on your other cheek and you want to do IG-SRT again, that’s perfectly acceptable. We’d just plan it out the same way, maybe with minor adjustments if it’s near a previously treated area. The long-term safety profile remains good – superficial radiation doesn’t cause cumulative systemic issues, only local, and local we keep within limits.
Therefore, to answer succinctly: Yes, you can use IG-SRT again for future skin cancers. Each new cancer can be treated with the modality of your choice (be it IG-SRT or surgery), and IG-SRT remains an option as long as the new cancer is also a non-melanoma skin cancer that’s suitable for radiation.
