CD5+ diffuse large B-cell lymphoma (DLBCL) is aggressive, and Rituximab-Cyclophosphamide Hydroxydaunorubicin Vincristine Prednisone (R-CHOP) combined with radiotherapy is recommended, but prognosis is affected by age, Lactate Dehydrogenase (LDH) levels, and molecular characteristics such as TP53 mutations. The gene discussed is TP53; the disease is diffuse large B-cell lymphoma.