Proliferation of MCF-7 and MCF-10A cells induced by TH and OHT. MCF-7 (A) and MCF-10A (B) cells were treated with OHT (10 and 15 μM), TH (1%) and their combination for up to 48 hr followed by an MTT assay. Each value represents the mean ± SD that has been normalized against the respective control (taken as 100%). Statistical significance was determined by using the Student T test. Ψp < 0.01 for TH + OHT compared to TH; Ψp < 0.01 for TH + OHT compared to OHT; *p < 0.05, **p < 0.01 compared to untreated cells.