The primary aim of this IMN 1207 follow-up study is to confirm the effect of a cysteine-rich non-denatured whey protein isolate formulation IMN1207 (20g daily) versus casein (20 g daily) on the reversal of weight loss (cancer-related wasting) over a 40 week treatment period in non-small cell lung cancer patients with or without conventional therapy, i.e., chemotherapy or radiation. And to test the hypothesis that over a period of 66 weeks observation period which includes a 6 months follow-up period, increases the survival of these patients.