Table 1. The revised classification of lung adenocarcinoma (6).
(I) Preinvasive lesions |
(i) Adenocarcinoma in situ (AIS) —mucinous, nonmucinous, or mixed |
(ii) Atypical adenomatous hyperplasia (AAH) |
(II) Minimally invasive lesions |
(i) Minimally invasive adenocarcinomas (MIA) —mucinous, nonmucinous, or mixed |
(III) Invasive adenocarcinoma |
(i) Acinar predominant |
(ii) Papillary predominant |
(iii) Micropapillary predominant |
(iv) Solid predominant with mucin production |
(v) Lepidic predominant adenocarcinoma (LPA) |
(IV) Variants of invasive adenocarcinoma |
(i) Invasive mucinous adenocarcinoma |
(ii) Colloid, fetal, and enteric |
IASLC/ATS/ERS classification of lung adenocarcinoma in resection specimens; IASLC/ATS/ERS, the International Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society.