Table 1. Characteristics associated with gene expression profiles
| Group 1 | Group 2 | |||
| Gene expression profile | Ressembles normal lung | "Proliferative" and "invasive" gene clusters | ||
| p-value | ||||
| Smoking status | 0.01 | |||
| Never smoker | 35 (61%) | 28 (50%) | ||
| Ever smoker | 22 | 28 | ||
| Lepidic component | 0.00005 | |||
| Yes | 31 (54%) | 12 (21%) | ||
| No | 26 | 34 | ||
| EGFR mutation | 0.0002 | |||
| Yes | 32 (56%) | 16 (30%) | ||
| No | 25 | 38 | ||
| KRAS mutation | 0.02 | |||
| Yes | 4 (7%) | 14 (25%) | ||
| No | 53 | 41 |