Method for predicting survival of non small cell lung cancer patients with brain metastasis

A method of treating a patient diagnosed with a non-small cell lung cancer with brain metastasis, the method comprising:

• (a) calculating a temporal muscle thickness reduction gradient (TMTrg) from the patient as calculated by:
• TMTrg=(Final temporal muscle thickness (TMT)−Initial TMT)/Follow-up period,
• wherein,
• the Final TMT is a TMT measured at a survival prediction point and is measured in millimeters (mm);
• the Initial TMT is a TMT measured at initial diagnosis of the patients' brain metastasis and measured in mm;
• and
• the Follow-up period is an interval between Initial TMT measurement time point and Final TMT measurement time point and measured in months;
• and
• (b) treating the patient with surgery, chemotherapy, radiation, or administering a therapeutic agent when the calculated TMTrg is −0.185 or more and less than 0.