 1. Phase I and Phase II: Confirmed diagnosis of mantle cell lymphoma with CD20 positivity in tissue biopsy. Patients must have previously treated relapsed andor refractory MCL. Or for Phase II: Confirmed diagnosis of previously treated relapsed andor refractory diffuse large B-cell lymphoma, transformed large cell lymphoma, andor Grade 3 follicular lymphoma follicular cleaved large cell lymphoma or follicular non-cleaved large cell lymphoma. 