I have melanoma through out my body sub-cutaniously, therefore I am put at a stage 4. The only way we know that is we had to biopsy 3 places. Only one spot showed on my Petscan. I understand what you are going through. I am playing the waiting game to find out my next treatment which is going to be some sort of Chemo. I am being treated by Johns Hopkins in Baltimore. They are great, so keep them in mind. Good luck!