My own non terminal bout of cancer meant meeting up with on a daily basis at one point those who were goung through similar treatment, some of whom were terminal. It's amasing how quickly that similarity burns through the politeness of 'How are you'. The dark discussions of how you are not remain leavened with humour which would seem based on years rather than days but those years are the shared humanity.
I've spoken to Gordon that I have form of survivor's/imposter's guilt on this arising from both the catching of the cancer at an early stage, and that the treatment had few side effects, none of which were detrimental to the health of how I looked. I would often get told by people, sometimes in the semi shock of disbelief and relief, that I looked really well. The lack of knowledge of the difference between therapies leading them to fear they were meeting someone whose very essence had been irradiated from them.