In this phase II multi-institutional trial, the investigators will identify genes associated with either good or bad outcome in DLBCL patients treated with R-CHOP, will construct a robust predictive models based on RNA extracted from or paraffin specimens as well on immunohistochemistry and will examine the predictive power of new biomarkers associated with the anti-tumor effects of rituximab. The acquisition of fixed tissue as a component of this uniformly treated prospective study will also afford future studies with this informative dataset.
