RATIONALE: Measuring the number of radiolabeled white blood cells in non-Hodgkin's lymphoma tumors may help doctors predict how well patients will respond to treatment, and may help the study of cancer in the future. PURPOSE: This study is measuring radiolabeled white blood cells in patients with non-Hodgkin's lymphoma.
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Number of baseline indium In 111-labeled peripheral blood mononuclear cells (PBMCs) trafficking into tumors
Number of baseline indium In 111-labeled polymorphonuclear leukocytes (PMNLs) trafficking into tumors
Number of PBMC and PMNL trafficking prior to vs after therapy
Cellular uptake of PBMCs and PMNLs as measured by reader/visual interpretation, semiquantitative grading system, and tumor-to-background uptake ratios