Thre has only been the one that I know of. There is no way to search signatures. It is relativley rare, and the one person that has posted here is still doing well though he has been told that his long term prognosis is not positive. Without knowing why you are looking for this in particular, I will just comment that melanoma in all areas, oral or otherwise, is very hard to cure, and has poor survival rates.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.