gossypol, by virtue of reducing the activity of Bcl 2 and or Bcl X L in cancer cells or supporting cells, increases the proportion of cells in a subject that will respond to the cell damaging effects of cancer therapeutic drugs or radiation therapy by executing the apoptosis program, leading to a greater tumor response in subjects treated in combination with gossypol and the cancer therapeutic drug or radiation therapy compared to those treated with chemo radiation alone buy cialis daily online