Stage 4 means the cancer has spread to distant part. you rightly said that this is not curable...then why chemo?
has two definite roles......first it prolongs the life of patient as compared to non-receivers.....secondly it has got some palliative effect on the symptoms of cancer.
the choice of chemo depends on two broad subtypes....small cell lung cancer
which is more dangerous and secondly Non small cell lung cancer...
It will be my advice to you that please go for chemotherapy.....its just 4-6 cycles..