Ray Sahelian, MD has been doing research on Noni and has a good explanation of medicine. Noni juice contains a polysaccharide- rich substance called noni-ppt with anti tumor activity.
In a study conducted at the University of Hawaii, the administration of noni- ppt considerably increase the survival of mice with long tumors. The researchers say, "This shows the possible clinical application application of noni- ppt as additional agents in the treatment of cancer." Noni is also reduce the risk of cancer in current smokers with a decrease in romatic adducts.