The attached & links below describes how oxidative stress plays a key role in Cancer.
One of glutathione's crucial roles is to mediate free radical damage.
The Use of a Whey Protein Concentrate in the Treatment of Patients with Metastatic Carcinoma: A Phase I-II Clinical Study
Whey proteins in cancer prevention
Dietary milk proteins inhibit the development of Dimethylhydrazine-induced malignancy
Dietary whey protein inhibits the development of dimethylhydrazine induced malignancy
Whey protein concentrate (WPC) and glutathione modulation in cancer treatment
Enhancing effect of patented whey protein isolate (Immunocal) on cytotoxicity of an anticancer drug
Nutriceutical modulation of Glutathione with a humanized native milk serum protein isolate, Immunocal: application in AIDS and cancer
Glutathione System in Defense of Prostate Problems
Molecular pathogenesis and prevention of prostate cancer.
Effect of supplementation with a cysteine donor on muscular performance
Antioxidants and Cancer Prevention Fact Sheet - National Cancer Institute
Low colonic glutathione detoxification capacity in patients at risk for colon cancer
The glutathione biotransformation system and colorectal cancer risk in humans