Poor Prognostic Factors in Patients With Stage IB Non-small Cell Lung Cancer According to the Seventh Edition TNM Classification

We identified the presence of intratumoral vascular invasion and the presence of visceral pleural invasion as independent poor prognostic factors in patients with stage IB NSCLC. When these two factors are combined, higher- and lower-risk subgroups can be identified, which will help to personalize adjuvant chemotherapy.