Cancer is a heterogeneous group of diseases defined by dysregulated and uncontrolled cellular growth and a leading cause of morbidity and mortality in the human population. In the United States alone, there are almost 2 million new cases each year, with over 600,000 deaths [1]. Due to the genetic and molecular complexity of cancer, and neoplasia in general, treatment selection and outcome are widely variable, and seldom does one cancer respond precisely as another to any treatment regimen.