Hi Shirley: your dad's profile shows a long and aggressive fight against lung cancer. As Don Wood says, avastin in combo with a chemo may help, and has not been tried yet according to your dad's profile, but I think they would have to get the white blood cell count under control first.
Personally, I think that for myself, I may opt for quality of life at some point rather than fighting the lc aggressively to the bitter end. Of course, I don’t really know for sure what I would do unless I was at that moment. It depends on what your dad wants to do. You all have my best wishes.
Don M