Pulmonary enteric adenocarcinoma (PEAC) is a rare type of lung cancer, identified as a distinct variant by an international classification in 2011, notable for its tall columnar cells resembling intestinal lining.
The study examined 9 cases of PEAC alongside 20 cases of metastatic colorectal cancer (MCR) and typical primary adenocarcinoma (tPAC), focusing on immunohistochemical markers to differentiate them.
Findings revealed that PEAC consistently expressed CK7, lacked common mutations seen in typical lung adenocarcinomas, and had unique characteristics that distinguish it from other cancer types.