inotuzumab ozogamicin

CR was the disappearance of leukemia indicated by less than (\<) 5 percent (%) marrow blasts \& absence of peripheral blood leukemic blasts, with recovery of hematopoiesis defined by absolute neutrophil count (ANC) greater than or equal to (≥)1000 per microliter (/μL) \& platelets ≥100,000/μL. C1 extramedullary disease status (i.e. complete disappearance of measurable \& non-measurable extramedullary disease with the following exceptions: for participants with at least 1 measurable lesion, all nodal masses greater than (\>) 1.5 centimeters (cm) in greatest transverse diameter (GTD) at baseline must have regressed to less than or equal to (≤) 1.5 cm in GTD; all nodal masses ≥1 cm \& ≤1.5 cm in GTD at baseline must have regressed to \<1 cm GTD or reduced by 75% in sum of products of greatest diameters, no new lesions, spleen \& other previously enlarged organs must have regressed in size \& must not be palpable) was required. CRi was defined as CR except ANC \<1000/μL \&/or platelets \<100,000/μL.

OS was defined as the time from randomization to date of death due to any cause. Participants last known to be alive were censored at date of last contact.

MRD negativity status is determined based on the minimum MRD percentage between the date of CR/CRp/CRi and end of treatment test as assessed by RQ-PCR, with reflex to FC result if MRD is non-evaluable by RQ-PCR

DLT was any of the following in the first cycle \& attributable to inotuzumab ozogamicin: any greater than or equal to (≥) Grade 4 non-hematologic toxicity except nausea/vomiting (if manageable with supportive care), alopecia, \& toxicities secondary to neutropenia \& sepsis; prolonged myelosuppression (absolute neutrophil count \[ANC\] less than \[\<\] 500 per microliter \[/µL\] or platelet count \<25,000/µL in bone marrow with \<5 percent (%) blasts \& no evidence of leukemia more than 45 days beyond the most recent dose of test article); any Grade 3 non-hematologic toxicity (excluding toxicities such as alopecia or those secondary to neutropenia \& sepsis) not resolving to ≥ Grade 2 within 7 days of the most recent dose of test article or was clinically significant irrespective of duration; any ≥ Grade 3 elevation of alanine aminotransferase, aspartate aminotransferase or bilirubin lasting ≥7 days; any test article related toxicity resulting in permanent discontinuation of test article.

CR was the disappearance of leukemia indicated by \<5% marrow blasts and absence of peripheral blood leukemic blasts, with recovery of hematopoiesis defined by ANC ≥1000/µL and platelets ≥100,000/µL. C1 extramedullary disease status was required. CRi was as for CR except with ANC \<1000/µL and/or platelets \<100,000/µL. PR was an improved or no worsening of acute lymphocytic leukemia indicated by no peripheral blood blasts, and/or at least a 50% decrease in the marrow blast percentage, compared to pre-treatment value, and marrow blast percentage ≥5% and less than or equal to (≤)25% and/or C2 extramedullary disease status. RD occurred if a participant survived ≥7 days following completion of initial treatment course and had persistent leukemia in the most recent peripheral blood smear or bone marrow and/or persistent disease involvement at any extramedullary site after completion of therapy.

CR was defined as a disappearance of leukemia as indicated by \<5% marrow blasts and the absence of peripheral blood leukemic blasts, with recovery of hematopoiesis defined by ANC ≥1000/µL and platelets ≥100,000/µL. C1 extramedullary disease status was required. CRi was defined as CR except with ANC \<1000/µL and/or platelets \<100,000/µL.

CR was defined as a disappearance of leukemia as indicated by \<5% marrow blasts and the absence of peripheral blood leukemic blasts, with recovery of hematopoiesis defined by ANC ≥1000/µL and platelets ≥100,000/µL. C1 extramedullary disease status was required. CRi was defined as CR except with ANC \<1000/µL and/or platelets \<100,000/µL. PR was defined as an improved or no worsening of acute lymphocytic leukemia as indicated by no peripheral blood blasts, and either or both of the following: at least a 50% decrease in the marrow blast percentage, compared to the pre-treatment value, and marrow blast percentage ≥5% and ≤25% and/or C2 extramedullary disease status.

CR was defined as complete disappearance of all target lesions and disease-related symptoms; all nodes must have decreased to normal (less than or equal to \[≤\]1.5 cm in their greatest transverse diameter \[GTD\] for nodes more than \[\>\]1.5 cm before therapy) or ≤1 cm (short axis) in previously involved node; enlarged spleen prior to therapy must have regressed and be non-palpable; bone marrow lymphoma: infiltrate must have been cleared on repeat bone marrow aspirate and biopsy. PR was defined as \>50% decrease in the sum of the product diameters (SPD) of up to 6 index lesions. No increase in size of other nodes, liver or spleen. Splenic and hepatic nodules must have regressed by greater than or equal to \[≥\]50% in the SPD or GTD (for single nodules). With exception of splenic and hepatic nodules, involvement of other organs was usually assessable and no measurable disease should be present. No progression of non-target disease or new lesions.

Response criteria based on National Cancer Institute (NCI) International Response Criteria for non-Hodgkin's lymphoma. CR: no detectable clinical \& radiographic evidence of disease/disease-related symptoms; lymph nodes/nodal masses regressed to normal size (less than or equal to \[≤\] 1.5 cm in greatest transverse diameter for nodes greater than \[\>\] 1.5 cm pre-therapy); spleen \& other organs (if enlarged pre-therapy) regressed in size \& spleen not palpable on physical examination; repeat bone marrow infiltrate clear. PR: \> or equal to (≥) 50% decrease in sum of product diameters (SPD) of 6 largest dominant nodes/nodal masses; no increase in size of other nodes, liver, or spleen; splenic \& hepatic nodules regressed by ≥ 50% in SPD; involvement of other organs usually assessable \& no measurable disease present; no new sites of disease. Participants achieving CR, but with persistent morphologic bone marrow involvement or no bone marrow assessment after treatment were partial responders.

A DLT was defined as the following drug-related adverse event which occurred during the first 28 days: 1) Any National Cancer Institute (NCI) Grade 3 or 4 nonhematologic toxicity (except Grade 3 nausea or vomiting without optimal treatment), 2) Febrile neutropenia, 3) Grade 4 absolute neutrophil count lasting \>=7 days, 4) Grade 4 thrombocytopenia lasting \>=3 days, 5) Grade 3 or 4 thrombocytopenia associated with a bleeding episode requiring platelet transfusion, 6)Delayed recovery (to grade \<=1 or baseline, except alopecia) from a drug-related toxicity that delayed the next dose \>2 weeks

Inotuzumab ozogamicin was dose escalated (3 to 6 evaluable participants enrolled per dose cohort) during the first 28 days after the first administration of inotuzumab ozogamicin + rituximab. Enrollment at the next dose level or enrollment of additional subjects into a cohort proceeded according to the following criteria: 0 dose-limiting toxicity (DLT) by Day 28 of first dose move to higher dose, 1 participant reporting DLT but no others in cohort by Day 28 of first dose move to higher dose, greater than 2 participants reporting DLT by Day 28 of first dose stop and prior dose level considered MTD. The worldwide medical monitor and investigators reviewed all significant study drug-related toxicities to determine if the dose escalation rules were satisfied and whether the dose escalation schedule required modification.

A TEAE is any event that occurred after the first dose of study drug up to 56 days post the last dose of study drug (either rituximab or inotuzumab ozogamicin).

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. An SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent adverse events (TEAE) are defined as any new event reported after first dose of study drug up to 42 days after last dose of study drug, or any event that is worse in severity than at any time during the baseline period. AEs included both SAEs and non-serious adverse events (non-SAEs).

AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. AE severity was defined to be the maximum toxicity grade of the treatment-emergent adverse events (TEAEs) experienced by the participants during the study. AE was assessed according to severity; Grade 1 (mild AE), Grade 2 (moderate AE), Grade 3 (severe AE), Grade 4 (life-threatening or disabling AE), Grade 5 (death related to AE). Participants with Grade 3 or higher grades TEAEs were reported.

MTD was defined as highest dose level for which no more than 1 participant in a dose cohort experienced dose limiting toxicity (DLT). DLT was defined as any of the following events occurring during the first 21 days (or 28 days for participants treated every 4 weeks) days of study medication and considered at least possibly-related to study medication: any grade 3 or 4 non-hematologic toxicity except grade 3 alopecia, nausea, or vomiting, any grade 4 febrile neutropenia, any grade 4 thrombocytopenia or any bleeding episode requiring platelet transfusion, any grade 4 absolute neutrophil count (for a duration of greater than or equal to \[\>=\] 7 days), delayed recovery (less than or equal to \[\<=\] grade 1 or baseline) from a toxicity that delays the initiation of the next dose by more than 2 weeks.

DLT was classified as per National Cancer Institute common terminology criteria for adverse events (NCI CTCAE) version 3.0 and defined as any of the following events occurring during the first 21 days (or 28 days for participants treated every 4 weeks) days of study medication and considered at least possibly-related to study medication: any grade 3 or 4 non-hematologic toxicity except grade 3 alopecia, nausea, or vomiting, any grade 4 febrile neutropenia, any grade 4 thrombocytopenia or any bleeding episode requiring platelet transfusion, any grade 4 absolute neutrophil count (for a duration of greater than or equal to \[\>=\] 7 days), delayed recovery (less than or equal to \[\<=\] grade 1 or baseline) from a toxicity that delays the initiation of the next dose by more than 14 days.