- (GROUP A) De novo diffuse large B cell lymphoma that fails to achieve a PET negative complete response to primary rituximab and anthracycline based multi-agent chemotherapy and at least maintains stable disease after salvage chemotherapy or present double/triple hit features defined by overexpression by standard immunohistochemistry of c-MYC plus BCL2 and/or BCL6 or presence of chromosomal translocations as detected by break-apart FISH involving IGH/MYC plus IGH/BCL2 and/or IGH/BCL6 and who only received standard chemoimmunotherapy with rituximab, cyclophosphamide, vincristine and prednisone (R-CHOP) for induction and present at least stable disease after consolidation or salvage chemotherapy. Stable disease (SD) for lymphoma is defined in Appendix B: Lugano Classification for Response Assessment of Non-Hodgkin Lymphoma.