Radiation Therapy Alone for the Treatment of Stage 1 and 2 Mucosa-Associated Lymphoid Tissue (MALT) Lymphoma

PRIMARY OBJECTIVE: I. To determine the efficacy and toxicity of radiation therapy alone in treating stage 1 and 2 MALT lymphoma for newly diagnosed patients and for the patients who failed other treatment modalities. OUTLINE: Patients undergo radiation therapy once daily (QD) 5 times weekly over 3.5-5 weeks. After completion of study treatment, patients are followed up at 6-8 weeks, and then every 3-4 months for year 1, every 4-6 months for year 2, every 6 months for years 3 and 4, and once yearly thereafter.