Diagnosed with stage 4 NSCLung Cancer in Dec. 2016 and started taking Tarceva on Feb. 17 at 150 mg. This dosage shrunk my cancer in half;however, my liver functions went sky high. SCCA determined that dosage was too toxic for me and reduced the dosage to 100mg. Was on it for a week and woke with terrible headache and fuzzy thinking. My liver also headed right back up. However, they did an MRI and it was now determined that there was no visible cancer in my brain. Now I'm on 75 mg. and the fussy vision and headaches are starting again. Went for a walk in our local park with lots of hills and valleys apprx. 2 1/8th mile walk. That was it for the day for me. Made dinner and watched t.v. I am scheduled to go back in this coming Thursday to do blood tests and possibly CT. I have been told that even if they get rid of the EGFR cancer that it will still be in my blood stream. So, am wondering if there is another option to just maintain or arrest the development and spread of this cancer. Once they biopsied my original EGFR cancer, it was released into my blood stream. Don't know much about this because I'm learning as I go along. Anyone out there know if there is a way to control the EGFR in my blood?