My dads got non operatable stage 4 colon cancer with mets to liver. His CEA went from 121 to 7. Doc says this is good. does it mean the cancer is almost gone? We have beeen told it will not go away. Incurable, whatever. He is 61 years old. He is still very sick though. He has this pain in his left side that is so severe. He also constantly has an urge to have a bm. even after he does. He goes potty every morning like clockwork. He is on 150 mg fentynol patch, 40 mg time release oxycotin, and 5 mg oxycodone for breakthru pain and just cant get the pain under control. he is going for a cat scan next week ordered by his gp. the onc says it cant be the cancer but it all started when he started chemo 6 months ago. Any clue anyone?