Effect of AL on proliferation inhibition and apoptosis induction in colorectal cancer in vitro . A, AL significantly suppressed the proliferation of both SW620 and HCT116 cell lines evaluated by MTT assay as described under “Materials and methods”. B, Degree of AL-induced apoptosis in SW620 cell lines were determined by Live/Dead assay. Data are presented as relative increase in apoptosis of treated cells compared with untreated control cells. Similar results were obtained in three independent experiments.*, P < 0.05; **, P < 0.01 vs. control.