My husband was diagnosed with adenocarcinoma stage 4 nsc lung cancer poorly differentiated. He had a liquid biopsy and dna sequencing done and was started on 2 chemo drugs and immunotherapy (kaytruda). He also has a plural effusion and the lung is collapsed. We were told that the tumors were massive and that it was also in the lining of his lung as well as all the lymph nodes tested. We were told he was not a candidate for surgery or radiation but were not told why. We also were never told why it is stage 4. His other lung is clear as was his brain mri. Does anyone know why a lobectomy is out and what makes it a stage 4?