A method of treatment and / or prevention of
cancer comprises administering agents which cause increased
intracellular granularity in
cancer cells, at least in an amount sufficient to inhibit proliferation of such cells and preferably in an amount sufficient to lead to
cancer cell death. The method is particularly directed to
refractory cancer, particularly
hormone refractory prostate cancer. The agents identified cause increased
intracellular granularity in the cancer cells, and also convert adherent cancer cells to non-adherent cancer cells, leading to
cancer cell death. Using the present invention, cancer cells undergo increased
intracellular granularity at relatively low agent concentrations, while also inhibiting
cell proliferation. Increased concentrations lead to conversion of adherent cancer cells to non-adherent cancer cells, then to
cell death. While the exact mechanism of
cancer cell degradation and death is not completely understood, the treated cancer cells, including
refractory prostate cancer cells, give indications of cell death through an autophagic mechanism. Pharmaceutical compositions related to the presently disclosed methods are also disclosed.