Bendamustine

On Day 2 of Cycle 1, three electrocardiograms (ECGs) were collected 15 minutes prior to any study drug administration. The baseline ECG interval value was obtained by averaging these 3 ECGs, and was compared to the average of the 3 ECGs taken on treatment with bendamustine at the end of the infusion.

The ORR was defined as the percentage of participants who achieved a best response of complete response (CR) or partial response (PR) during the study based on the modified International Workshop Response Criteria. CR: disappearance of all evidence of disease; nodal masses regression on normal size on computed tomography (CT); spleen and liver not palpable and nodule disappeared; bone marrow infiltrate cleared on repeat biopsy. PR: Regression of measurable disease and no new sites; nodal masses ≥50% decrease in sum of the product of the diameters (SPD) of up to 6 largest dominant masses and no increase in size of other nodes; spleen and liver ≥50% decrease in SPD of nodules and no increase in size of liver or spleen.

CR=complete disappearance of all detectable clinical evidence of disease and disease-related symptoms, if present pretherapy; protocol-specified positron emission tomography (PET) scan assessment criteria; (if the spleen and/or liver were enlarged on the basis of physical examination and/or anatomic imaging before treatment) the liver and/or spleen were considered normal size on physical examination and by anatomic imaging after therapy, with disappearance of all nodules related to lymphoma; (if the bone marrow was involved by lymphoma before treatment) the infiltrate must have cleared on subsequent bone marrow biopsies.

The IWG criteria (Cheson et al 2007) for a CR is a complete disappearance of all detectable clinical evidence of disease and disease-related symptoms if present before therapy. A PR is at least a 50% decrease in sum of the product of the diameters (SPD) of up to 6 of the largest dominant nodes or nodal masses, no increase should be observed in the size of other nodes, liver or spleen, and no new sites of disease should be observed.

The International Working Group (IWG) criteria (Cheson et al 2007) for a complete response is a complete disappearance of all detectable clinical evidence of disease and disease-related symptoms if present before therapy. A partial response is at least a 50% decrease in sum of the product of the diameters (SPD) of up to 6 of the largest dominant nodes or nodal masses, no increase should be observed in the size of other nodes, liver or spleen, and no new sites of disease should be observed. 95% CIs are calculated using binomial exact method.

Proportion of patients undergoing BFR-TBI conditioning + haploidentical alloHSCT alive at 30 days post-transplantation.

Maximum tolerated dose was the dose that was 1 step lower than the dose where at least one third of patients experienced DLT. A DLT was defined as any of the following occurring during the first cycle: * grade 4 hematologic toxicity without regard for relationship to study drug treatment * thrombocytopenia grade 3 with grade 3 or grade 4 hemorrhage * grade 3 febrile neutropenia * grade 3 or grade 4 nausea and vomiting refractory to anti emetic therapy * any study drug related grade 3 or grade 4 nonhematologic toxicity * any drug related death Toxicity grades (3=severe AE and 4=life-threatening or disabling AE) were assessed using the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) v3.

RP2D was determined by a traditional 3+3 dose escalation design, with the following restrictions: only doses of 60, 90, 120, and 150 mg/m\^2 were explored, and escalation to 150 mg/m\^2 would only occur if the 120 mg/m\^2 dose was deemed safe and pharmacokinetic data indicate subtherapeutic exposure as compared with adults. The first cohort was administered bendamustine at the 90 mg/m\^2 dose; de-escalation to the 60 mg/m\^2 dose would only occur if the starting dose led to dose-limiting toxicity (DLT) in 2 or more participants. A DLT was defined as any study drug-related nonhematologic adverse event (AE) that was grade 4 for toxicity by National Cancer Institute's Common Toxicity Criteria for AEs, version 4. In addition, grade 3 or above allergic reaction or skin rash were considered DLTs. Hematologic AEs were not considered DLTs. The dose level at which at least 2 of 3 or 2 of 6 participants had a DLT was considered as exceeding the RP2D. The RP2D was the dose 1 step below that level.

ORR was calculated as follows: number of participants in the primary analysis set achieving a best overall response of complete remission without platelet recovery (CRp) or complete remission (CR), divided by the number of participants in the primary analysis set. The most positive response for each patient during the study was counted. The 95% CI was calculated using binomial parameter exact method. Response was determined by the investigator, and evaluated per Jeha et al, 2006: A CR required no evidence of circulating blasts or extramedullary disease, an M1 marrow (≤ 5% bone marrow blasts), and recovery of peripheral counts (platelets ≥ 100 × 10\^9/L and absolute neutrophil count ≥ 1.0 × 10\^9/L). A CR without platelet recovery (CRp) required all of the criteria for a CR with the exception of platelet recovery.