Methods of stimulating an immune response and treating patients responsive thereto with 3,4-di(1H-indol-3-yl)-1H-pyrrole-2,5-diones, staurosporine analogs, derivatized pyridazines, chromen-4-ones, indolinones, quinazolines, nucleoside analogs, and other small molecules are disclosed. In a preferred embodiment benzopyrimidine derivatives such as ZD-6474, MLN-518, lapatinib, gefitinib or erlotinib are used.