Figure 2. Kaplan-Meier curves of recurrence-free survival.

The recurrence score of the 17-gene signature predicts poor clinical outcome in lung cancer. The black curves are for the 17-gene-signature-positive patients, while the gray curves are for the 17-gene-signature-negative patients. The 17-gene-signature-positive patients were defined as those having a recurrence score greater than the group median score. P-values were calculated using log-rank tests for the differences in survival. The left panel shows the training cohort (KR), while the middle and right panels show the validation cohorts (JP and SE).