This is a prospective, open-label, single-arm, umbrella phase 2 clinical trial enrolling 32 adult patients with newly diagnosed Philadelphia chromosome-negative (Ph-) B-cell acute lymphoblastic leukemia (B-ALL). All patients receive a frontline treatment backbone consisting of low-dose chemotherapy combined with immuno-targeted agents and a BCL2 inhibitor. Subsequent treatment pathways are guided by MRD response, disease characteristics, and clinical decision-making, including antibody-based immunotherapy, CAR-T cell therapy, or hematopoietic stem cell transplantation. All patients continue protocol-defined maintenance therapy after consolidation. The primary endpoint is the complete remission rate with negative flow cytometric MRD after induction therapy. MRD is monitored longitudinally by flow cytometry, quantitative PCR, and immune repertoire sequencing. Safety is evaluated according to NCI CTCAE version 5.0.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
32
Anti-CD22 antibody-drug conjugate (ADC) administered intravenously during induction and consolidation therapy.
BCL-2 inhibitor administered orally daily during induction and consolidation cycles to enhance leukemic cell apoptosis.
CD19/CD3 bispecific T-cell engager (BiTE) administered as continuous intravenous infusion during consolidation therapy.
Autologous CD19 CAR-T cell therapy administered as a single intravenous infusion as optional consolidation therapy for eligible patients.
A vinca alkaloid that inhibits microtubule formation by binding to tubulin, resulting in mitotic arrest and inhibition of proliferation of rapidly dividing leukemic cells.
An alkylating agent that forms DNA cross-links, leading to inhibition of DNA replication and transcription and subsequent apoptosis of rapidly proliferating hematopoietic cells.
A synthetic glucocorticoid that induces lymphoid cell apoptosis and exerts anti-inflammatory and immunosuppressive effects, contributing to reduction of leukemic burden.
A folate antimetabolite that inhibits dihydrofolate reductase, resulting in impaired DNA synthesis and cell replication, particularly in rapidly dividing lymphoid cells.
A pyrimidine nucleoside analog that inhibits DNA polymerase, leading to termination of DNA chain elongation and inhibition of leukemic cell proliferation.
A glucocorticoid that induces apoptosis in lymphoid cells and provides anti-inflammatory and immunosuppressive effects as part of multi-agent leukemia therapy.
A purine analog antimetabolite that interferes with purine nucleotide synthesis and incorporates into DNA and RNA, inhibiting nucleic acid synthesis and cell proliferation.
Flow Cytometric MRD-Negative Complete Remission Rate
Proportion of patients achieving complete remission (CR) with negative measurable residual disease (MRD) assessed by multiparameter flow cytometry after completion of induction therapy.
Time frame: At the end of induction therapy (approximately 1 month after treatment initiation)
Next-Generation Sequencing (NGS)-MRD Negative Remission Rate
Proportion of patients achieving MRD-negative remission assessed by immune repertoire sequencing.
Time frame: Within 3 months after treatment initiation
Best MRD Clearance Rate
Proportion of patients achieving the deepest MRD response during the first 3 months of treatment as assessed by flow cytometry, quantitative PCR, or immune repertoire sequencing.
Time frame: Within 3 months after treatment initiation
Overall Survival (OS)
Time from study enrollment to death from any cause.
Time frame: Up to 5 years
Disease-Free Survival (DFS)
Time from achievement of complete remission to relapse or death from any cause.
Time frame: Up to 5 years
Relapse-Free Survival (RFS)
Time from achievement of MRD-negative remission to hematologic relapse or death.
Time frame: Up to 5 years
30-Day Mortality
Proportion of patients who die from any cause within 30 days after treatment initiation.
Time frame: 30 days
60-Day Mortality
Proportion of patients who die from any cause within 60 days after treatment initiation.
Time frame: 60 days
Incidence of Adverse Events
Frequency, severity, and type of adverse events graded according to the National Cancer
Time frame: From treatment initiation through completion of study treatment, up to 5 years
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