Proliferation of Ca9-22 oral cancer cells is inhibited by methanolic extracts of G. tenuistipitata (MEGT). Cells were incubated with various concentrations of MEGT (0, 0.01, 0.25, 0.5, and 1 mg/ml) for 24 h. Cell viability was determined by WST-1 assay. Data are expressed as mean ± S.E. (n = 3). Differences between treatments of different concentrations containing the same letter are not significant.