This study demonstrates that testing 3 molecular markers (c-Ki-ras, p53 and c-erbB-2) improves estimation of prognosis compared to single marker testing and appears to define low (82.6% ± 7.9% 5-year survival) and high risk (40.2% ± 5.5% 5-year survival) groups for treatment failure in potentially curative (RO) resected NSCLC. Here, KRAS is linked to non-small cell lung carcinoma.