NCT06861348

Effectiveness and Safety of InO±DLI for Relapsed B-ALL/LBL After Allo-HSCT

Effectiveness and Safety of Inotuzumab Ozogamicin±Donor Lymphocyte Infusion for Relapsed B Cell Acute Lymphoblastic Leukemia/Lymphoblastic Lymphoma After Allogeneic Hematopoietic Stem Cell Transplantation：Phrase II, Multicenter Study

• Status: Not Yet Recruiting
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 23 (estimated)
• Sponsor: First Affiliated Hospital of Zhejiang University · Academic / Other
• Sex: All
• Age: 14 Years – 65 Years
• Healthy volunteers: Not accepted

Summary

B cell acute lymphoblastic leukemia (B-ALL)/Lymphoblastic lymphoma (LBL) is a hematological malignancy caused by malignant transformation and clonal expansion of B-lineage precursor cells. Allogeneic hematopoietic stem cell transplantation (allo-HSCT) remains a potential curable therapy for ALL, especially for high-risk ALL patients. However, post-HSCT recurrence is the primary cause of transplant failure and salvage treatment option for this patient population are very limited. Current data showed that the CR rate and overall survival (OS) in adults with ALL who relapse after transplantation are as low as 30% and 25%, respectively, and the prognosis is extremely dismal. Some researchers have successfully salvage treated relapsed B-ALL patients after transplantation with donor lymphocyte infusions (DLI), but the response rate of DLI alone is usually less than 10%, with increased risk of Graft-Versus-Host Disease (GvHD). In the immunotherapy era, the introduction of immuno-designed therapies like bispecific antibody constructs, antibody conjugates, as well as chimeric antigen receptor T cell (CAR-T) therapy, have immensely broadened the treatment landscape of relapsed or refractory (r/r) B-ALL. Inotuzumab ozogamicin (InO) is a CD22-targeted monoclonal antibody conjugated to the cytotoxic antibiotic calicheamicin. Based on the pivotal Phase III INO-VATE clinical trial published in N Engl J Med in 2016, compared to standard chemotherapy, 73% (64/88) of r/r B-ALL patients treated with InO achieved CR/CRi in the first cycle. Superior CR duration, OS and relapse free survival (RFS) was also observed in the InO group. Subgroup analysis showed that the treatment benefits were consistent for patients who relapsed after allo-HSCT. Moreover, a single-center retrospective study attempted to salvage treat relapsed B-ALL patients after transplantation with combined InO and DLI, results showed that six out of eight patients achieved CR after the first InO course and 75% of patients obtained MRD negativity after the second course, which is quite satisfactory. Therefore, we designed a Phase II clinical study of InO combined with or without DLI in patients with recurrent acute B-ALL/LBL after allo-HSCT, with expectation to increase CR rate and improve long-term survival.

Conditions

• Leukemia, Lymphocytic, Acute

Interventions

Type	Name	Description
DRUG	Inotuzumab Ozogamicin±Donor Lymphocyte Infusion	Participants will receive Ino±DLI regimen: * ① InO induction dose: the first cycle: 0.8mg/m2, intravenous infusion, d1; 0.5 mg/m2, intravenous infusion, d8, d15; * ② If CR/CRi was reached after induction, the second cycle :0.5mg/m2, intravenous infusion, d1, d8，d15; If CR/CRi is not reached, Cycle 2 :0.8mg/m2, IV infusion, d1; 0.5 mg/m2, intravenous infusion, d8, d15; * ③DLI dose: CD3 positive cells 1x10\^7/kg; DLI indication: no previous grade III-IV aGVHD, negative HLALOSS test and no present aGVHD and cGVHD; * Lumbar puncture: cytarabine 50mg+dexamethasone 5mg+methotrexate 10mg, intrathecal injection, once a month after remission, a total of 4-6 courses of treatment.

Timeline

• Start date: 2025-03-01
• Primary completion: 2026-04-30
• Completion: 2027-04-30
• First posted: 2025-03-06
• Last updated: 2025-03-06

Locations

1 site across 1 country: China