William, What a tough question! Since you had chemo[carboplatin]radiation, and surgery, I don't think you can single out one" part of your treatment" that might not be so good. Carboplatin has worked for many people. From what I have read, 5 yrs. out is a very good thing! Are you getting regular checkups? Losing your friend is a very upsetting experience and surely brings up many questions in your mind. Tell your Doc. about your fears and increased anxiety level[if that is what it is] Amy