The Treatment of Ocular Adnexal Extranodal Marginal Zone B-cell Lymphoma by Orelabrutinib and Radiotherapy

Inclusion Criteria: * 1: Male or female, aged 18-75 years. 2: Newly diagnosed patients with Marginal Zone B-cell lymphoma of ocular adnexa confirmed by surgical biopsy, with early Ann Arbor stage (stage I/II) and evaluable lesions (\> 1cm) on imaging. 3: Laboratory tests prior to admission must meet the following criteria: white blood cell count ≥3.0x10\^9/L, absolute neutrophil count ≥1.5 x10\^9/L, hemoglobin ≥90g /L, platelets ≥75x 10\^9/L. Liver function: transaminase levels≤3 times the upper limit of normal, bilirubin levels ≤1.5 times the upper limit of normal. Serum creatinine clearance ≥30 mL/min. Myocardial enzymes \< 2 times the upper limit of normal (same age). ECOG score 0-2. 4: All subjects must provide informed consent and voluntarily sign the written informed consent form themselves or through their legal representatives before participating in the study. Exclusion Criteria: * 1: Pregnant or lactating women, and women of childbearing potential who refuse to use contraceptive measures. 2: Inability to swallow, chronic diarrhea, or intestinal obstruction, or any condition that affects drug use and absorption. 3: Pre-trial treatment: Use of drugs that significantly affect the P450 metabolic enzyme pathway within 2 weeks before the screening period. Current use of cyclosporins or fibrates. Participation in other clinical studies and use of investigational drugs within 28 days prior to the initiation of the study drug. The need to use concomitant drugs that may prolong QTc or induce tip torsion ventricular TdP, in addition to antimicrobials used as standard care to prevent or treat infections and other such drugs that investigators consider essential for treatment. 4: Evidence of current uncontrolled cardiovascular disease, including: Uncontrolled high blood pressure. Uncontrolled arrhythmia. Symptomatic congestive heart failure. Unstable angina. Myocardial infarction within the past 6 months. Severe acute or chronic infections requiring systemic treatment. Known human immunodeficiency virus (HIV) infection , or active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection. Have a history of uncontrolled seizures, a central nervous system disorder, or a mental illness. 5: History of malignant tumors other than OA-EMZL, unless the patient has been cured for more than 3 years. 6: Any past or current disease, treatment, or laboratory abnormality that may interfere with the study results or affect the subject's full participation in the study, or the investigator deems the subject unfit to participate in the study.