Adult Aged Aged, 80 and over Antineoplastic Combined Chemotherapy Protocols--therapeutic use Cyclophosphamide--therapeutic use Doxorubicin--therapeutic use Female Humans Lymphoma, Non-Hodgkin--diagnostic imaging Male Middle Aged Neoplasm Recurrence, Local--diagnostic imaging Neoplasm Staging Predictive Value of Tests Prednisone--therapeutic use Radiopharmaceuticals Technetium Tc 99m Sestamibi Tomography, Emission-Computed, Single-Photon Treatment Outcome Vincristine--therapeutic use