Fig. 1

Arnidiol inhibits cell proliferation and colony formation in human cancer cells. a The chemical structure of Arnidiol (Arn). b Multiple cancer cell lines were treated with various doses of Arn for 48 h, and cell proliferation was measured by MTT assay. c and d Colony formation was detected using a soft agar assay in MDA-MB-231 cells (mean ± SD for 3 independent experiments, ^*P < 0.05, ^**P < 0.01 or ^***P < 0.001 compared with control)