DISEASE CHARACTERISTICS: Histologically confirmed mantle cell lymphoma (MCL) requiring therapy NCCTG pathology review required - Repeat biopsy is required for previously treated patients with previously biopsy proven MCL who relapse after achieving a partial or complete remission - Rebiopsy is not required for patients with: Progression of previously biopsy proven MCL who have not received therapy since the diagnostic biopsy OR Previously biopsy proven MCL who progress or achieve less than a partial remission following initial therapy Measurable or evaluable disease