The goal of this phase 2 trial is to test the safety and efficacy of G-Pola-GemOx as induction therapy in patients with Refractory/Relapsed Aggressive B-Cell Lymphoma.

The investigators will evaluate safety and efficacy of G-Pola-GemOx as induction therapy in Refractory/Relapsed Aggressive B-Cell Lymphoma. ORR(Overall response rate, progression-free survival (PFS), overall survival (OS), adverse events (AEs) will be assessed.

Inclusion Criteria:

• Pathologically confirmed Aggressive B-Cell Lymphoma (Including but not limited to diffuse large B-cell lymphoma, mantle cell lymphoma, Burkitt lymphoma, high-grade B-cell lymphoma, etc. according World Health Organization (WHO) classification;
• Patient is ≥ 18 years of age at the time of signing the informed consent form (ICF).
• Patient must understand and voluntarily sign an ICF prior to any study-specific assessments/procedures being conducted;
• Patient is willing and able to adhere to the study visit schedule and other protocol requirements;
• Patient has not received chemotherapy previously.
• Anticipated life expectancy at least 3 months

Exclusion Criteria:

• Active or uncontrolled infections requiring systemic treatment within 14 days before enrollment.
• Any instability of systemic disease, including but not limited to severe cardiac, liver, kidney, or metabolic disease need therapy.
• Pregnant or lactating women