The present invention relates to the soluble glucan oligomer having a M.W.
ranging from 1,000 to 10,000 prepared by treating insoluble beta-glucan
isolated the cell wall of yeast variant IS2 with commercially available
beta-glucan hydrolyzing enzymes. The soluble glucan oligomer showed
potent efficacy on promoting immune activity and on inhibiting the growth
of cancer cell, therefore, it can be used as the therapeutics or health
care food for treating and preventing immunodeficiency and cancer