OncoFinder maps the gene expression data onto known and custom intracellular signaling pathways. These pathways regulate numerous processes involved in normal and pathological conditions including development, growth, aging, and cancer. Analysis of these signaling pathways makes it possible to measure differences in physiological state such as aging, disease, or chemical exposure among individual samples using microarray data. The difference in gene expression among signaling pathways can be used to predict which drugs and other interventions will be most effective for improving health. For example, OncoFinder can be used by researchers to analyze the effectiveness of drugs for cancer treatment or to determine pathways involved in age-related diseases.