Table 3. Variable selection of biomarkers using Random Forests.
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Biomarkers
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Variables | MIP-1α | SCF | CEA | TNF-RI | TNF-α | IFN-γ | M-CSF | G-CSF | TNF-RII | sICAM-1 | MMP-2 | CRP | IL-2Rα | Osteopontin | IL-1ra | OOB | |
| 1 | 15 | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | 0.336 |
| 2 | 12 | X | X | X | X | X | X | X | X | X | X | X | X | 0.308 | |||
| 3 | 10 | X | X | X | X | X | X | X | X | X | X | 0.308 | |||||
| 4 | 8 | X | X | X | X | X | X | X | X | 0.317 | |||||||
| 5 | 6 | X | X | X | X | X | X | 0.308 | |||||||||
| 6 | 5 | X | X | X | X | X | 0.289 | ||||||||||
| 7 | 4 | X | X | X | X | 0.345 | |||||||||||
Abbreviations: OOB=out-of-bag (misclassification error); TNF=tumour necrosis factor; IL=interleukin; MMP=matrix metalloproteinases; MIP=macrophage inflammatory protein; CRP=C-reactive protein; SCF=stem cell factor; IFN=interferon; G-CSF=granulocyte colony-stimulating factor; M-CSF=monocyte colony-stimulating factor; sICAM-1=soluble intracellular adhesion molecule 1.