RecruitingDiagnostic testFeasibility and Clinical Utility of Cell-free DNA (cfDNA) in Identifying Actionable Alterations and Minimal Residual Disease for Lymphoma Patients Across Community Centers in TexasTo test the feasibility of collecting cell-free DNA (cfDNA) samples from DLBCL patients before and after treatment. cfDNA is DNA traveling in your blood outside of a cell and is easily collected from blood samples drawn using the vein puncture method.