Table 4. Ranking of each marker according to its importance for predicting Lung Cancer.

Marker	Boosted Regression			Random Forests
	Rank	Median Importance a	Range	Rank	Median Importance a	Range
CAL	1	69	56–82	1	10	9–10
sCD26	2	16	6–31	2	7	6–8
EGF	3	13	5–24	3	6	6–7
sEGFR	4	2	0–7	4	5	4–5
VEGF	5	0	0–4	6	4	4–4
HB-EGF	6	0	0–1	5	5	4–5

^a Importance measures report method-specific estimates of the individual contribution to prediction of each evaluated biomarker. Medians values and range over 1000 runs are provided.