On sarcoma 180 solid tumor in ddY mice using lentinan, an antitumorβ-D-glucan, as the positive control. Hexa-N-acetylchitohexaose (100 mg/kg/day; 3 times; intravenous ) significantly inhibits the growth of this allogenic solid tumor, affording a high tumor growth-inhibition ratio (85%) at 7 days after tumor implantation.