"In 2011, the International Association for the Study of Lung Cancer (IASLC), American Thoracic Society (ATS), and European Respiratory Society (ERS) 2 introduced a new classification and terminology for adenocarcinoma of the lung, which is now divided into "preinvasive", "minimally invasive", and "invasive"."
"It is often defined as a tumour of >3 cm in total size and/or has >5 mm lymphatic, vascular or pleural invasion with a non-mucinous lepidic predominant growth pattern 6."