B lymphoblastic leukemia lymphoma

The goal of this clinical trial is to evaluate the efficacy of Blinatumomab in pediatric patient with newly diagnosed acute B-Lymphoblastic leukemia with poor response to early chemotherapy, i.e. day 19 MRD ≥ 0.1% (low-risk) or day 19 MRD ≥ 0.01% (intermediate-risk). The main question is:
• If the flow cytometric MRD negative (<0.01%) rate and the NGS- MRD negative (<0.0001%) rate at the end of induction for patients received Blinatumomab will be superior to historical control (D46MRD in the CCCG-ALL2020 protocol).
Participants will:
* Take 14 days full dose Blinatumomab;
* With bone marrow evaluated before and after Blinatumomab treatment.

This study is a multi-center, open, prospective single-arm clinical study of patients with relapsed / refractory B cell hematological tumors to evaluate the safety and efficacy of CD19 & CD20 bispecific CAR-T cells in relapsed / refractory B cell hematological tumors while collecting pharmacokinetics and pharmacodynamics indicators of CAR-T cells.

B-ALL patients received regular follow-up after allogeneic hematopoietic stem cell transplantation, and in case of recurrence, they were given Blinatumomab.
Anti-treatment was followed by DLI, and the second course was performed 1-2 months after DLI.
Patients with positive MRD were treated with Blinatumomab 28μg×5-15 days, followed by DLI treatment.
(MNC infusion is about 5×10^7/kg
1×10^8/kg). Patients with hematologic recurrence were given Blinatumomab 9μg D1-4,11.66μg d5-7,28μg Starting from d8 （8 to 21 days in total）, followed by DLI treatment (infusion of MNC approximately 5×10^7/kg
1×10^8/kg). Objective To observe and analyze the efficacy and side effects of Blinatumomab followed by donor lymphocyte infusion in patients with relapsed acute B lymphoblastic leukemia after allogeneic hematopoietic stem cell transplantation in our hospital.