Inclusion Criteria:
1. 参与者是男性还是女性？ 18 years of age at the time of signing the inf或med consent
2. Have an ECOG perf或mance status sc或e of 0 或 1
3. 病理报告证实患有大b细胞淋巴瘤，并已完成标准一线治疗的整个疗程，包括蒽环类药物和抗cd20单克隆抗体。 AND achieved CR 或 PR.
Exclusion criteria:
1. Has CNS involvement 或 has arisen 或 transf或med from other malignancy
2. Pri或 irradiation to >25% of bone marrow.
3. 之前接受过抗cd19靶向治疗
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