Selinexor Combined With R-GemOx as Second-line Treatment in Patients With Diffuse Large B-cell Lymphoma

After the subject has completed at least 2 courses of treatment with Serenixol and R-GemOx for up to 6 courses, the patients who have reached ≥ partial remission (PR) and meet the conditions of transplantation can receive transplantation according to the institutional standards, and those who are not suitable for transplantation can receive maintenance treatment with Serenixol. In the maintenance treatment, the dose of Serenixol is 60 mg on the first day of the week until the disease progresses In case of intolerable toxicity or if the researcher believes that the patient is no longer suitable for study treatment, re-examine every 3 months in the first year, the second year and every 6 months after the end of transplantation or maintenance treatment; Patients with stable disease (SD) or disease progression (PD) after 2\~6 courses of treatment will end the trial, and no survival follow-up will be conducted