RLC Followed by CR-CHOP in Elderly Patients with Newly-diagnosed DEL

Inclusion Criteria: * 1\. Untreated DLBCL patients confirmed by histopathology 2. Immunohistochemistry showed positive expression of MYC and BCL2 protein (double expressor lymphoma, MYC≥40%, BCL2≥50%) 3. age over 70 years old or age ≥65 years old and ECOG score ≥2 points, both male and female 4. Having at least one evaluable lesion, defined as having at least one lymphadenopathy with a maximum diameter \> 1.5 cm, or at least one extranodal lesion with a maximum diameter \> 1.0 cm, and at least two vertical diameters that can be accurately measured. 5\. ECOG PS≤3 6. Expected survival time ≥3 months 7. voluntary participation in clinical research; Fully understand and understand the study and sign the informed consent; Willingness to follow and ability to complete all research steps. Exclusion Criteria: * 1\. The pathological subtypes were PCNSL, PMBCL, EBV-positive DLBCL and HGBL 2. Hemophagocytic syndrome accompanied the diagnosis 3. Central nervous system involvement is secondary to lymphoma 4. Are participating in other clinical studies, or the first study drug is administered less than 4 weeks after the end of treatment in the previous clinical study 5. HIV infection 6. Major surgery was performed within 28 days prior to study start 7. Any active infection that required systematic anti-infective therapy developed within 14 days prior to study initiation 8. The patients considered by the investigator to be unsuitable for participating in this study