Yes, the cure achieved by IG-SRT is considered permanent for that treated cancer. Once the cancer cells are destroyed and the area has healed with healthy tissue, those particular cancer cells are gone for good. The expectation is that the treated skin cancer will not return (with ~99% confidence as discussed). So in that sense, the result – meaning the removal of that cancer – is permanent.
It’s not a temporary fix or something that requires maintenance treatment on the same lesion (unlike some superficial therapies that require repeats, IG-SRT is definitive). Once you’re done, you’re done for that site, as long as it doesn’t recur (which it likely won’t).
The cosmetic result is also essentially permanent. You won’t suddenly develop a scar later – how it heals in the months after treatment is how it will likely stay, aside from gradual subtle changes with age and sun like any skin. For instance, if at one year post-treatment the area looks great and scar-free, it’ll continue to look that way going forward. If there’s a slight color difference, that might persist but could improve; regardless, the state at one year is basically the lasting outcome.
However, “permanent” doesn’t mean immune to future changes: you could still, hypothetically, get a new cancer in the same general area of skin if new DNA damage occurs there, or the surrounding area might get new sun spots, etc. But that would be a new occurrence, not the old one coming back.
So, effectively: IG-SRT permanently eradicates the treated tumor, and the cure is lasting. We don’t expect to ever have to treat that exact lesion again once cleared. We just watch and prevent others.
Another aspect: If we talk about permanent side effects, some minor ones like skin texture changes or telangiectasia can be permanent. But those are often minor. The question likely was aimed at whether the cancer is permanently gone, to which the answer is yes.
To draw an analogy, if you had a cavity filled in a tooth, the result (the tooth being fixed) is permanent, but you could get a new cavity later in a different spot. Similarly, your skin cancer’s gone permanently, but you could get another one somewhere else (or rarely right there if it recurred, but that’s unlikely).
Thus, you can trust that the result of curing that particular cancer is permanent. Your dermatologist will consider you cured at that site after appropriate follow-up time has passed. “Permanent” here is basically synonymous with “long-term cure.” And indeed IG-SRT provides long-term control of >5 years in the vast majority of cases as shown in studies.
So yes – once it’s gone, it’s gone, and you can move forward, with just routine check-ups and preventive care as discussed.
