Lentinan (C6H1PJn is a long chain branched polysaccharide of shiitake mushroom (Letltinus edodes). Its primary structure is a f3-1,3,-D-glucan having 2-f3-1,6 glucopyranoside branchings for every 5 f3-1, 3 linear linkages. Lentinan has been clinically applied as an antitumor and antimetastatic drug, and has been reported to prevent both chemical and viral carcinogenesis. It is known that lentin…