Serum INF-γ levels of ASPS in solid tumour-bearing mice. *P<0.05 and **P<0.01 vs. normal group; ##P<0.01 vs. control group; $$P<0.01 vs. model group; ∆∆P<0.01 vs. CTX group. INF, interferon; ASPS, Acanthopanax senticosus polysaccharide; CTX, cyclophosphamide; ASPS200, 200 mg/kg ASPS; ASPS100, 100 mg/kg ASPS; ASPS50, 50 mg/kg ASPS.