In the 45% of patients with known EGFR-expression status, the hazard ratio was 0.68 (CI 0.49-0.94) for patients with EGFR-positive tumours and 0.93 (CI 0.63-1.36) for patients with EGFR-negative tumours (defined by IHC using EGFR pharmDx kit and defining EGFR-negative as less than 10% tumour cells staining).