Clinical Study of OR for Second-line Treatment of Refractory MZL

This is a single-arm trial. Patients with relapsed/refractory marginal zone lymphoma will be treated with the OR regimen. The treatment plan is as follows: Orelabrutinib 150mg oral administration once a day, Day 1-21; Rituximab 375mg/m² intravenous infusion, Day 1. Each cycle is 21 days. PET-CT evaluation will be conducted after 4 cycles. If a partial response (PR) or better is achieved, the patient will receive further treatment with the OR regimen for an additional 4 cycles before transitioning to single-agent maintenance therapy with either rituximab or obinutuzumab. If a PR or better is not achieved after 4 cycles, the patient will discontinue from the trial.