1. A method of constructing a system for predicting a subject's medical outcome, comprising: identifying a group of subjects with the same medical condition; classifying the group of subjects with the same medical condition into one or more subgroups, wherein the one or more subgroups are classified based on similarity of medical outcome, using classification and regression trees (CART) to generate a classification tree based on the presence of identifying genetic characteristics and wherein each node in the classification tree describes the presence of a specific genetic marker and each branch in the classification tree describes a genetic profile that predicts a subject's medical outcome.