It has been proposed that stepwise progression occurs from atypical adenomatous hyperplasia (AAH) through bronchioloalveolar carcinoma (BAC) to invasive lung adenocarcinoma.

• 已经提出肺的不典型腺瘤样增生(AAH)到支气管肺泡癌(BAC)再到侵袭性肺腺癌发病过程。