It has been discovered that amplifications in the gene coactivator activator (CoAA) blocks stem cell differentiation and induces cancer stem cells. One embodiment provides compositions and methods for treating or alleviating one or more symptoms associated with cancer due to gene amplifications in CoAA. Another embodiment provides methods and compositions for detecting cancer due to gene amplifications in CoAA. Still another embodiment provides methods for identifying compounds, antibodies and nucleic acid molecules that are useful for treating cancer due to gene amplifications in CoAA. Preferably the disclosed compositions antagonize or interfere with the CoAA amplicons and the biological activity of CoAA and or splice variants thereof.