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.
This trial studies the side effects of radiation therapy used alone, and if it can achieve a high cure rate in the treatment of patients with MALT lymphoma. Radiation therapy uses high energy sources to kill cancer cells and shrink tumors. This treatment may improve the patient's lymphoma.