I think that you need to get a clarification from your doctors. What you have described does not seem right. Biopsy that reveals SCC doesn't indicate "sleeping or inactive" cancer cells. If squamous cell carcinoma cells are reported in the biopsy, then they still exist as a threat. Your doctors need to explain in detail to you the pathologist's report, and exactly what is still active and what has been controlled, at least from the perspective of the biopsies that were done. There should be no confusion in your mind about this when they are done. It is essential that this understanding exists so you can make intelligent treatment decisions for the future. PET scans, as I have said many times before are helpful, but they throw up a bunch of false positives and false negatives, all of which must be verified by an actual biopsy.