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Comparison of density gradient centrifugation systems for the enrichment of disseminated tumor cells in bone marrow (BM)
| After Ficoll | Gradient System | |
| HistoPaque | OncoQuick | |
| Tumor cells recovered (%) | 34 ± 2 | 41 ± 8 |
| BM cells remaining (%) | 51 ± 5 | 10 ± 1 |
| BM mononuclear cell enrichment factor | 1.5–2.5 | 9–14.5 |
| Number of slides | 51 | 10 |
