Gene expression pattern of MRP1, MRP4, and ABCG2 in human AML. Expression of MRP1, MRP4, and ABCG2 in adult AML patients was queried in Oncomine database for different FAB subtypes. Only the subtypes with significant expression of at least one of these transporters are shown. Red indicates high expression, blue indicates low expression, and gray indicates not measured. p-Value is for the median-ranked analysis.