PGG intake by oral gavage inhibits MDA-MB231 tumor growth in female athymic nude mice. Starting 4 days after cell inoculation, PGG (20 mg/kg) was gavaged with 2% Tween-80 as vehicle to these animals once a day. (a) Body weight. (b) Tumor volume. Values are mean ± standard deviation (n = 10 mice per group). Statistical significance: analysis of variance PGG effect on tumor size, P < 0.0001. PGG, penta-O-galloyl-β-D-glucose.