The purpose 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 subjects with or without conventional therapy, i.e., chemotherapy or radiation. In addition, it is prospectively designed to test the hypothesis that, IMN1207 versus casein over a period of 66 weeks observation period which includes a 6 months follow-up period, increases the survival of these subjects. Also, the effect of IMN1207 on the quality of life in a defined subgroup of subjects will be determined.