2. Histologically confirmed DLBCL, Transformed low grade lymphoma to DLBCL, primary mediastinal B cell lymphoma or unclassifiable lymphoma between DLBCL and Burkitt Lymphoma, either in first or second relapse/progression in patients who are not candidates for ASCT or in second relapse/progression post ASCT (as first salvage therapy following relapse/progression post ASCT).