A chemotherapy regimen consisting of etoposide, prednisone, vincristine (Oncovin) and doxorubicin hydrochloride (hydroxydaunorubicin hycrochloride), which may be used in combination with rituximab (R-EPOCH) for the treatment of various aggressive B cell and T cell non-Hodgkin lymphomas. OR An abbreviation for a chemotherapy combination used to treat aggressive forms of non-Hodgkin lymphoma, including mantle cell lymphoma. It includes the drugs etoposide phosphate, prednisone, vincristine sulfate (Oncovin), cyclophosphamide, and doxorubicin hydrochloride (hydroxydaunorubicin). Also called EPOCH.