An Open-label, Phase 1/2 Study Of Inotuzumab Ozogamicin In Subjects With Relapsed Or Refractory Cd22-positive Acute Lymphocytic Leukemia

Percentage of Participants With Preliminary Satisfactory Response (Complete Response [CR], CR With Incomplete Count Recovery [CRi], Partial Response [PR], or Resistant Disease [RD]) Indicating Disease Stability After First Dose During Phase 1 Dose-Finding

时间窗: From screening to progressive disease or another induction therapy started, up to approximately 2 years

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.

Percentage of Participants With CR, CRi or PR During the Phase 1 Expansion Phase

时间窗: From screening to progressive disease or another induction therapy started, up to approximately 2 years

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.

Percentage of Participants Reporting Dose Limiting Toxicities (DLTs) During the Phase 1 Dose-Finding Phase

时间窗: Cycle 1

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.

Percentage of Participants With CR or CRi During Phase 2

时间窗: From screening to progressive disease or another induction therapy started, up to approximately 2 years

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.