I too was diagnosed with squamous cell cancer. My was in the anus. The size of a golf ball. After 6 weeks of chemo and radiation. My first CAT scan was last week and it showed that the cancer is gone. It was a large tumor, the size of a golf ball. My radiologist is concerned that the rectal wall is thickened so he ordered a PET scan. That was done this past Monday. Today we will have a video call to discuss results. Next week I will have a colonoscopy because of all my stomach issues…mostly related to the radiation. I’m feeling scared and depressed after reading how the cancer reappears. Like you, I will find out how often this occurs and where. That will be my second question after I ask about my scan. I wish you luck and good scan results