I have non small cell stage 4 lung cancer. I also have an autoimmune disorder called Giant Cell Arteritus; I have been taking Prednisone about eight years for this condition. During that time I did develop other prednisone related illnesses as well as breast cancer that resulted in surgery. The two cancers are unrelated. This week I start taking Tarceva. I hope it buys me a little more time, although I've probably overstayed my welcome! Does anyone know if these two drugs are compatible? If not, are you aware of the side effects? Thanks for including me as a member, and I wish each one of you a very happy recovery!