- CLL-must have either 1) failed to meet National Cancer Institute (NCI) Working Group criteria for complete or partial response after therapy with a regimen containing fludarabine (FLU) (or another nucleoside analog, e.g. cladribine [2-CDA], pentostatin) or experience disease relapse within 12 months after completing therapy with a regimen containing FLU (or another nucleoside analog); 2) failed FLU-cyclophosphamide (CY)-Rituximab (FCR) combination chemotherapy at any time point; or 3) have "17p deletion" cytogenetic abnormality; patients should have received induction chemotherapy or ibrutinib but could be transplanted in 1st CR; or 4) patients with a diagnosis of CLL (or small lymphocytic lymphoma) or diagnosis of CLL that progresses to prolymphocytic leukemia (PLL), or T-cell CLL or PLL; 5) patients failing to achieve a response to ibrutinib as first-line therapy; 6) patients not responding to ibrutinib, idelalisib, or venetoclax as salvage therapy or intolerant of these agents as salvage therapy due to side effects