dude, i live near you in johnstown pa, you gotta get your mom to pittsburgh asap, trust me, lost my dad to cancer, but they saved my uncle, he had the same as your mom, and yeah they took out only the bad part of his one lung, so don't give up hope yet,
just went down and asked my mom, she said the guys name is dr. lukatich, he's involved with upmc hospital in pittsburgh, and in my opinion he and upmc are the best cancer docs/hospital around, they know their sh*t, get mom there soon, and i hope and wish ya all the best
pm me, i'll give ya my cell number if you need any more help with this