RecruitingDrug trialStudy on Predicting Response to Standard First-Line Treatment in Diffuse Large B-Cell Lymphoma (DLBCL) Patients Using ctDNA Combined With PETThis is a prospective, multicenter, multi-cohort study of ctDNA combined with PET for predicting the efficacy of standard first-line therapy for patients with newly diagnosed diffuse large B-cell lymphoma (DLBCL).