This research is being done because Richter’s transformation, which is a life- threatening complication of chronic lymphocytic lymphoma (CLL), and is associated with poor overall survival rate. The study drug administration is a combination of the investigational drug, Polatuzumab vedotin, in combination with Rituximab, Etoposide, Prednisone, Cyclophosphamide, and Hydroxydaunorubicin, also referred to as PolaR-EPCH. An investigational drug means it has not been approved by the FDA or any other international regulatory agencies. The purpose of this study is to find out what effects the...