Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-32299-0
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Funding
- Korean Health Technology R&D Project, Ministry of Health Welfare [H16C1990]
- AACR SU2C [SU2C-AACR-DT12-14]
- NCI [U54CA209988]
- Brenden-Colson Center for Pancreatic Care
- OHSU Center for Spatial Systems Biomedicine (OCSSB)
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The use of four groups of tumor immune microenvironments (TME) based on PD-L1 and tumor-infiltrating T lymphocytes (TIL) is a reliable biomarker for anti-PD-1/PD-L1 inhibitor therapy. We classified the TME in 241 gastric cancers which were subdivided according to 40 EBV+, 76 microsatellite instability-high (MSI-H), and 125 EBV-/microsatellite-stable (MSS) subtypes by quantitative image analysis (QIA) and correlated the results with mRNA expression levels. The mean PD-L1 ratio and CD8 ratio in EBV+, MSI-H, and EBV-/MSS GCs were significantly different (P < 0.006). The PD-L1 ratio and CD8 ratio obtained by QIA correlated well with the RNA levels of PD-L1 (r = 0.63) and CD8 (r = 0.67), respectively. The TME were type I (PD-L1(H)/CD8(H)) in 45, type II (PD-L1(L)/CD8(L)) in 106, type III (PD-L1(H)/CD8(L)) in 8, and type IV (PD-L1(L)/CD8(H)) in 82 cases. The type I TME was significantly associated with high TIL (P = 3.0E-11) and EBV+status (P = 8.55E-08). In conclusion, QIA results correlated well with the mRNA expression levels and classified TME of gastric cancers.
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