Can u share on Lung cancer stage CT3N2M1?

My friend father is taking treatment from last 8 month..his age is 62..DR.has diagnosed as ct3n2m1 stage..he is not a smoker and drunkard ...but affected by this..now he has taken 6 chemotherapy ..now going hospital monthly once for check up..can anyone share on his stage who know abt it..(oncologist also)