RecruitingPhase 2Drug trialA Study of PET Adapted Therapy and Non-invasive Monitoring for Previously Untreated Limited Stage Diffuse Large B Cell LymphomaThe overarching goals of this study are to measure levels of circulating tumor DNA (ctDNA) in patients with early stage diffuse large B cell lymphoma (DLBCL), to assess the change in ctDNA during treatment in order to prospectively identify markers of treatment failure, and to use ctDNA as a future tool for response adapted therapy.