My Father Is Suffering From Adenosqumoua Carcinoma Of Lungs,upper Lobe

my father is suffering from adenosqumoua carcinoma of lungs,upper lobe on left side. his age is 74 yrs.treatment started in november 2013 with cemotherapy cisplatin + gemitibine. 6 cycle. again cycle of docifact. Again started radiaion. but after 6 radiation , stopped due to weakness. now its 1 month we stoped the treatment.

what is life expectency in this case after we stopped the treatment.
what should be next treatment because he is very weak now.