I am a fit person, 58, was cycling 250-300k's a week for years. Diagnosed with lung cancer and taking Iressa Gifitinib. It sems to be working so far. My breathing had declined btween diagnosis and the treatment starting. It has stabilised now i am the treatment. if the Gifitinibis working is it possible my breathing will improve, or is likely the damed done means i will have to tolerate some loss of breath?