Defining morphologic features of invasion in pulmonary non-mucinous adenocarcinoma with lepidic growth -A proposal by the IASLC Pathology Committee

Since the 8thedition of UICC/AJCC TNM classification system the primary tumor pT stage is determined based on presence and size of the invasive components. The aim of this study was to identify histological features in tumors with lepidic growth pattern that may be used to establish criteria for distinguishing invasive from non-invasive areas.