Prediction of erlotinib sensitivity in NSCLC patients. (a) Months-to-progression plotted against predicted probability of erlotinib sensitivity. All patients are EGFR wild-type. KRAS mutations are highlighted and a linear regression line is shown. (b) The predicted probability of sensitivity to erlotinib plotted against months-to-progression for individuals treated with sorafenib. NSCLC, non-small cell lung cancer.