<qa>  What is the goal of this clinical research study?The goal of this clinical research study is to find the highest tolerable dose of the drug lenalidomide Revlimid, lenalidomide that can be given with Rituxan rituximab in the treatment of relapsed mantle cell lymphoma. The safety and effectiveness of this combination treatment will also be studied in both mantle cell lymphoma and diffuse large B-cell non-Hodgkins lymphoma, transformed large cell lymphoma, andor Grade 3 follicular lymphoma follicular cleaved large cell lymphoma or follicular non-cleaved large cell lymphoma. 