A potent anti_tumor effect of extracellular polysaccharide of Agaricus blazei, FP_A_2, produced by submerged fermentation,was studied.The effect was dose_dependent.

• 巴西蘑菇深层发酵胞外多糖FP_A_2具有显著的抗肿瘤效果,并呈剂量依赖性。