RATIONALE: Studying samples of blood and tissue from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer. PURPOSE: This research study is looking at blood and tissue samples from patients with aggressive non-Hodgkin B-cell lymphoma or Hodgkin lymphoma.
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Proportion of patients with diffuse large B-cell/immunoblastic and Burkitt histologies with elevated serum free light chains (FLC)
Timeframe: Study entry
Proportion of patients with Hodgkin lymphoma clonal immunoglobulin (Ig) DNA detection in the plasma
Timeframe: Study entry