Bowel and lung mets

I asked my onc which is easi to treat lung or liver.( have 4 sec lung mets)   He said lung?   I have been on various chemo since first dx 2010 tumors either stable or slight grumble.  Am currently on erbitux and folfox?     My concern if lung easier to treat why haven't they shrunk.    Also our first lung spec said non op.  went to a surgeon this week who said can as last resort but have 50/50 risk of nerve damage?   i feel good, sick of chemo regime.  They all talk quality of life?   Also my gene tested positive for the antibody which is suppose to make chemo far more effective.       Would luv to compare others results/thoughts