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P1.01 - Advanced NSCLC (ID 757)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Advanced NSCLC
- Presentations: 1
- Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
P1.01-066 - PDL-1 Expression of Tumor Cell, Macrophage, and Immune Cells on Pleural Effusion (ID 9841)
09:30 - 16:00 | Author(s): Y. Tseng
Immune checkpoint inhibitors provide a new treatment strategy for lung cancer. Therefore, microenvironment of tumor and interaction between immune cells and tumor cells become more important. Until now, the most frequently used marker to predict treatment response is immunohistochemical (IHC) stain of tumor PD-L1. However, the microenvironment of malignant pleural effusion is not clear. Weather we could use IHC stain of PD-L1 on cells of pleural effusion to predict treatment response have not been studied, either.
We retrospective enrolled patients who received malignant pleural effusion drainage and had cell blocks specimens from 2014-2016. IHC stain for PD-L1 was performed for tumor cells, immune cells, and macrophage of all cell block specimens. An experienced pathologist reviewed all the cell block cytology. The intensity of IHC stain was graded into grade 0, 1, 2, and 3. We also collected the clinicopathological characteristics of all patients.
PD-L1 expression of pleural effusion tumor cells was associated with the PD-L1 expression of pleural effusion macrophage (p=0.003) and immune cells (p<0.001). However, PD-L1 expression of immune cells is not associated with that of macrophages. PD-L1 expression of tumor cells is correlated with gender (p=0.012), smoking status (p=0.032), and ECOG performance status (p=0.017). Finally, PD-L1 expression of immune cells was associated with overall survival of our patients (p=0.004).
These results suggested that there might be an immune interaction of pleural effusion tumor cells with macrophage/immune cells, and low expression of PDL1 expression of immune cell are associated with poor survival of lung cancer patients with malignant pleural effusion.
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