The goal of this clinical trial is to test the overall response rate of Orelabrutinib combined with rituximab (OR regimen) for second-line treatment of relapsed/refractory marginal zone lymphoma.

Inclusion Criteria:

1. Age: 18 years, 80, Sex gender no limitied;

2. histological confirmation of MZL, For splenic marginal zone lymphoma (SMZL) where histological specimens of the spleen were not available, Requirements to meet the minimum diagnostic criteria for SMZL, And exclude any other type of small B cell lymphoma, That is, requiring a definite diagnosis of MZL;

3. at least one two-dimensional measurable lymph node lesion (CT scan or MR / display maximum diameter> 1.5cm), Or at least one two-dimensional measurable extranodal lesion (CT scan or MRI showing maximum diameter> 1.0cm);

4. the investigator required systemic treatment for marginal zone lymphoma;

5. at least 1 previous course of systemic lymphoma treatment (including previous immunotherapy or chemoimmunotherapy), 3 without efficacy above PR after imaging evaluation, Or disease progression after effective treatment;

6. ECOG, physical strength score 0-2;

7. primary organ function meets the following criteria 7 days prior to treatment:

   1. blood routine: absolute neutrophil ≥1.5x10^9 / L, Platelet≥ 75x10^9 / L, Hemoglobin≥75g / L; If the concomitant bone marrow invasion, Absolute neutrophil value ≥1.0x10^9 / L, Platelet≥50x10^9 / L, Hemoglobin≥ 50g / L;
   2. Blood Chemistry: total bilirubin ≤1.5 times ULN, AST or ALT ≤2 times ULN; If the liver is infiltrated with a lymphoma, Then, ALT and AST ≤5 times ULN, Serum creatinine ≤ 1.5 times ULN or creatinine clearance ≥45 ml/min (Cockcroft-Gault formula); Serum amylase ≤ULN;
   3. coagulation function: International normalized ratio (INR) ≤1.5 times ULN, Activated partial thromboplastin time (APTT)≤ 1.5 times ULN.
   4. cardiac color ultrasound: left ventricular ejection fraction 50%;

8. expected survival time of 3 months;

9. for men who did not undergo sterilization: agree to use the barrier contraceptive method during treatment and for at least 3 months after the last administration of obutinib or rituximab or on the older) as required in the guidelines established by the institution. In addition, male patients must agree to request their spouses to use other methods of contraception (e. g., oral contraceptives, intrauterine devices, barrier contraception, or spermicide).

10. For women who did not undergo sterilization: at least 28 days prior to consent to start study medication, during treatment, or after last administration of obutinib or rituximab, such as oral contraceptives, intrauterine devices or barrier contraception;

11. voluntarily signed written informed consent before test screening.

Exclusion Criteria:

1. The patient had been previously treated with obutinib in combination with rituximab, Efficacy was assessed as being refractory, Infraciness was defined as no remission (PR or CR) after start of treatment 4

2. history of severe allergy or allergic reaction to monoclonal antibody therapy

3. known to be allergic to any study drug

4. current or previous other malignancy, Unless curative treatment with no evidence of recurrence and metastasis in nearly 5 years;

5. lymphoma involvement of the central nervous system;

6. uncontrolled or important cardiovascular disease, Includes:

   1. occurrence of New York Cardiology Association (NYHA) grade II or above congestive heart failure, unstable angina, myocardial infarction within 6 months prior to the first administration of study drug, Or the presence of significant arrhythmias requiring treatment at screening (e. g., persistent rapid AF, persistent ventricular tachycardia, ventricular fibrillation, tip torsion, history of second-degree II AV (AV) block, or history of third-degree AV block), Left ventricular ejection fraction (LVEF) <50%;
   2. primary cardiomyopathy (e. g. dilated cardiomyopathy, hypertrophic cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy, restrictive cardiomyopathy, irregular cardiomyopathy);
   3. history of clinically significant QTc interval extension, Or subjects with coronary heart disease with QTc interval female> 470ms and male> 450ms;
   4. symptomatic or requiring medication;
   5. difficult-to-control hypertension (on the basis of improved lifestyle, With an adequate amount of 2 or more antihypertensive drugs (including diuretics) for more than 1 month, Or take 4 or more antihypertensive drugs to effectively control blood pressure).

7. Active bleeding within the 2 months prior to screening, Or are taking anticoagulant drugs, Or if the investigator considers a definite bleeding tendency;

8. urine protein 2 +, And 24-hour urinary protein quantification of 2g / 24 hours;

9. a history of deep vein thrombosis or pulmonary embolism;

10. clinically obvious gastrointestinal abnormalities, May affect drug intake, transport, or absorption (e. g. inability to swallow, chronic diarrhea, intestinal obstruction, etc.), Or subjects with total gastrectomy;

11. history of organ transplantation or allogeneic bone marrow transplantation;

12. major surgery within 6 weeks or minor surgery within 2 weeks before screening. Major surgery is using general anesthesia, but diagnostic endoscopy is not considered a major surgical procedure. The insertion of a vascular access device will be exempted from this exclusion criteria;

13. active infection or uncontrolled HBV (HBV DNA titer of 10 ^ 3 copies / ml), HCVAb positive, HI V/A IDS (Acquired Immune Deficiency Syndrome) or other serious infectious diseases;

14. subjects with current pulmonary fibrosis, interstitial pneumonia, pneumoconiosis, radiation pneumonitis, drug-related pneumonia, severe impairment of lung function, etc.;

15. Previous treatment with BTK, BCR, pathway inhibitors (such as PI3K, Syk), and BCL-2 kinase inhibitors;