Clinical Trial to Evaluate the Safety and Efficacy of IM19 CAR-T Cells in Patients With Relapsed and Refractory (R/R) B-cell Acute Lymphoblastic Leukemia

Inclusion Criteria:

• Relapsed or refractory B-ALL, defined as：1）Not chieving a CR after 1 cycle of standardchemotherapy for relapsed leukemia. 2）Any relapse after HSCT and must be ≥ 6 monthsfrom HSCT at the time of IM19 CAR-T cells infusion. 3）Primary refractory as defined bynot achieving a CR after 2 cycles of a standard chemotherapy regimen.
• Patients with Ph+ ALL are eligible if they are intolerant to or have failed two linesof TKI ± chemotherapy ；Ph + all patients with T315I mutation are not required toreceive at least two TKI ± chemotherapy in the absence of effective TKI therapy.
• Morphological evidence of disease in bone marrow (at least 5% blasts).
• Aged 3 to 70 years.
• Estimated life expectancy >3 months.
• ECOG performance status of 0 or 1(age ≥ 16 years) or Lansky (age < 16 years).
• Women of childbearing age who had a negative blood pregnancy test before the start ofthe trial and agreed to take effective contraceptive measures during the trial perioduntil the last follow-up; male subjects with fertility partners agreed to takeeffective contraceptive measures during the trial period until the last follow-up.
• Adequate organ function.
• Volunteer to participate in this trial and sign on the informed consent.

Exclusion Criteria:

• Subjects with lsolated extramedullary disease relapse.
• Subjects with Burkitt's lymphoma.
• Subjects has obvious symptoms of central nervous system invasion and needs targetedtreatment.
• Subjects has previously received gene product therapy.
• Subjects has graft-versus-host response（GVHD） and need to use immunosuppressants orGVHD ≥ grade 2 or being treated with anti GVHD or suffering from autoimmune diseases.
• Subjects has received chemotherapy or radiotherapy within 3 days before leukapheresis.
• Subjects received systemic steroids within 5 days prior to leukapheresis.
• Subjects received drugs that stimulated the production of hematopoietic cells in thebone marrow for 5 days prior to leucapheresis.
• Subjects has participated in other clinical studies within 1 month before screening orplan to participate in other drug clinical trials during this study.
• Subjects received allogeneic cell therapy within 6 weeks before leukapheresis.
• Subjects with History or presence of CNS disorder.
• Subjects with HBV, HCV, HIV ,EBV,ECV or syphilis infection at the time of screening.
• Pregnant or lactating, or planning pregnancy within 180 days after the end of CAR-Tcells infusion, or male patients whose partners plan pregnancy 180 days after theirCAR-T cell infusion.
• Subjects with other tumors in the past 5 years.
• Within 14 days before enrollment, there were active or uncontrollable infectionsrequiring systemic treatment.