This Phase II trial studies the overall tumor response of vaccine therapy in patientswith previously untreated Stage III or IV, asymptomatic, non-bulky follicular lymphoma. The vaccine contains an extract of the patient's own cancer cells and the immunostimulant protein, interleukin-2 (IL-2). It is hoped that when injected under the skin, the vaccine will enable the patient's immune system to recognize and destroy the cancer cells. The trial will also assess the safety of the vaccine, the time from vaccine treatment until the patient requires another type of anti-lymphoma treatment, progression-free survival, and the anti-tumor immune response.