This is a single-center, open-label and pragmatic clinical trial to evaluate the primary efficacy and safety of anti-CD19 chimeric antigen receptor (CAR)-modified T cells (CART-CD19) with concurrent BTK inhibitor in patients with relapsed or refractory B cell lymphoma

Anti-CD19 chimeric antigen receptor (CAR) T-cell has shown dramatical efficacy in B cell malignancies. And Bruton tyrosine kinase (BTK) inhibitor agents have been validated as an effective drug to treat B cell malignancies. Combined therapies comprising ibrutinib (a BTK inhibitor) and anti-CD19 CAR-T cells in patients with CLL after ibrutinib failure are considered feasible and safe.

Ibrutinib is the first-generation BTK inhibitror and Zanubrutinib is the second-generation BTK inhibitor. Orelabrutinib is a newly developed BTK inhibitor with high selectivity and have received its approval in China. Autologous cells derived T cells are purified and transduced with a lentiviral vector encoding the humanized CD19 scFv.

To evaluate whether the addition of BTK inhibitor (Ibrutinib, Zanubrutinib and Orelabrutinib) in anti-CD19 CAR-T cells therapy would further improve efficacy and safety, we intend to conduct this pragmatic clinical trial.

Inclusion Criteria:

1. Aged ≥ 18 years and ≤70 years.

2. Expected survival over 6 months.

3. Eastern Cooperative Oncology Group score≤ 2.

4. Diagnosed pathologically and histologically CD19+B cell lymphoma, including mantle cell lymphoma, chronic lymphocytic leukemia, follicular cell lymphoma, Burkitt lymphoma and diffuse large B cell lymphoma.

5. Patients have failed at least 1 line of prior therapy

6. Negativity of blood pregnancy test for woman, and participants use effective methods of contraception until last follow-up.

7. Patient or his or her legal guardian voluntarily participates in and signs an informed consent form.

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Exclusion Criteria:

1. Investigators judge the patients with gastrointestinal lymph node and/or central nervous system involvement who may be at high-risk of receiving CAR-T-CD19 cell treatment.

2. Existing or preexisting CNS conditions, such as epileptic seizures, cerebrovascular ischemia/hemorrhage, dementia, cerebellar disease, or any CNS related autoimmune diseases.

3. Patients with graft-versus-host reaction and need immunosuppressive agents, or patients with autoimmune diseases.

4. Participants with other active malignancies (except non-melanoma skin cancer and cervical cancer) within five years.

5. History of Richter's syndrome.

6. History of any one of the following cardiovascular conditions within the past 6 months: Class III or IV heart failure as defined by the New York Heart Association (NYHA), cardiac angioplasty or stenting, myocardial infarction, unstable angina, or other clinically significant cardiac disease.

7. Patients who are pregnant or breast-feeding.

8. Patients with any one of the following terms:

   A. Creatine >2.5mg/dl (221.0umol/L). B. Alanine aminotransferase/aspartate aminotransferase >3 times the upper limit of normal (ULN).

   C. Total bilirubin>2.0 mg/dl (34.2umol/L).

9. Major surgery within 4 weeks of randomization.

10. Systemic steroids are used within 2 weeks before apheresis (Except for those who are using inhaled steroids recently or currently).

11. Patients receive cytotoxic chemotherapy or radiotherapy within 21 days before enrollment (Tyrosine kinase inhibitors or other targeted therapies can be used two weeks before lymphodepleting chemotherapy).

12. Prior treatment with any gene therapy product.

13. Active hepatitis B, active hepatitis C, or active human immunodeficiency virus (HIV) infection.

14. Systemic fungal, bacterial, viral, or other infection that is not controlled.

15. The absolute value of lymphocytes was too low to manufacture CAR-T cells.

16. Other conditions considered inappropriate by the researcher.

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