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Gastrointestinal tract metastasis of lung cancer: The PD-L1 expression and correlated clinicopathological variables
Authors:Eri Ishikawa  Masato Nakaguro  Masanao Nakamura  Takeshi Yamamura  Tsunaki Sawada  Yasuyuki Mizutani  Keiko Maeda  Kazuhiro Furukawa  Yoshie Shimoyama  Hiroki Kawashima  Mitsuhiro Fujishiro
Affiliation:1. Department of Gastroenterology and Hepatology, Nagoya University Graduate School of Medicine, Nagoya, Japan;2. Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan;3. Department of Endoscopy, Nagoya University Hospital, Nagoya, Japan
Abstract:
The gastrointestinal tract is a rare site for metastatic lung cancer. Programmed cell death-ligand 1 (PD-L1) expression in lung cancer is a biomarker for the response to anti-PD-1/PD-L1 therapy. We investigated clinicopathological features and PD-L1 expression in 25 gastrointestinal metastatic tumors from the lung and primary adenocarcinoma of the small bowel. The small bowel was the most common site (16/25; 64%) of gastrointestinal tract lung cancer metastasis. A total of 19 (76%) of the gastrointestinal metastasis showed PD-L1 expression in ≥5% of tumor cells, with 14 (56%) showing high expression levels (≥50%). In contrast, 21 (84%) expressed PD-L1 in ≥5% immune cells, including 4 (16%) showing a high expression levels (≥50%). The PD-L1 expression on tumor cells and immune cells in primary lung cancer and corresponding gastrointestinal metastasis was concordant in 13 (68%) and 11 (58%) of the 19 paired cases, respectively. Small-bowel metastasis of lung cancer was characterized by a higher incidence of perforation (31% vs. 0%), ulcerated mass (83% vs. 60%), and neoplastic PD-L1 expression (75% vs. 0%) compared to primary small-bowel adenocarcinoma. Gastrointestinal metastasis from lung cancer might be a potential target for immune checkpoint inhibitor therapy, given its high expression of PD-L1.
Keywords:gastrointestinal metastasis  lung cancer  PD-L1  small bowel  small-bowel metastasis
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