Testing CC-486 (Oral Azacitidine) Plus the Standard Drug Therapy in Patients 75 Years or Older With Newly Diagnosed Diffuse Large B Cell Lymphoma

ann arbor stage iii diffuse large b-cell lymphoma, ann arbor stage iix (bulky) diffuse large b-cell lymphoma, ann arbor stage iv diffuse large b-cell lymphoma, diffuse large b-cell lymphoma activated b-cell type, diffuse large b-cell lymphoma associated with chronic inflammation, diffuse large b-cell lymphoma germinal center b-cell type, diffuse large b-cell lymphoma, not otherwise specified, ebv-positive diffuse large b-cell lymphoma, not otherwise specified, grade 3b follicular lymphoma, hhv8-positive diffuse large b-cell lymphoma, not otherwise specified, high grade b-cell lymphoma with myc and bcl2 and/or bcl6 rearrangements, high grade b-cell lymphoma with myc and bcl2 or bcl6 rearrangements