INA activated by UV prevents MCF7 propagation. The effect of INA treatment on the propagation of MCF7 cells was measured by a MTS assay. A. Cells were treated with 60 μM INA, 1% DMSO or used as is (control). They were then either exposed to UV light or kept in the dark (no UV). MTS measurements were performed 24 h later. B. Cells were treated with increasing amounts of INA and irradiated with UV. MTS measurements were performed after 24 h. Data are mean ± S.D of seven measurements.