My mother in law recently found out she has lung cancer I think it is sclc it has also spread to her brain but only in very early stages and only in one lung which has caused her to have a cough for 3 months and this should have been picked up earlier by her dr.  Does this mean extensive and stage 4.  She has had a full cycle of chemo a week after diagnoses, hasnt lost much weight and is not getting any headahces, vision or other related problems.  She will have 4 months of chemo and possibly radiation depending on how she responds to the chemo and after three sessions together wed-fri this week she is coping really well.  I am just wondering what to expect.  Is this classed as terminal the dr said 2 months without treatment maybe 2-12 months with but all depends on what happens with the secondary cancer.  How long does the chemo keep it at bay for before it would possibly return again?