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Cristian Ortiz -Villalón
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P3.09 - Pathology (Not CME Accredited Session) (ID 975)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Track:
- Presentations: 1
- Moderators:
- Coordinates: 9/26/2018, 12:00 - 13:30, Exhibit Hall
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P3.09-05 - Significance of the Expression of PD-L1/PD-1 by Tumoral and Immune Cells in Non-Small Cell Lung Cancer. (ID 14241)
12:00 - 13:30 | Presenting Author(s): Cristian Ortiz -Villalón
- Abstract
Background
Non-Small Cell Lung Cancer (NSCLC) accounts for approximately 85% of all cases of lung cancer, including adenocarcinoma, squamous cell carcinoma and large cell carcinoma. There is solid evidence that demonstrates the existence of anti-tumor adaptive T-cell mediated immunity activation in lung tumors, indicating that lung cancers are immunogenic. PD-L1and PD-1 expression level in lung cancer may be a predictive biomarker for the use of PD1/PD-L1 inhibitors. However, the reproducibility of PD-L1 staining using different antibodies and platforms is still a matter of debate. We assessed whether PD-L1 expression in non-small cell lung cancer is associated with specific clinical features or survival using four different antibodies and if the expression of PD-1 in TILs correlates with the expression of PD-L1 in same group of cells.
a9ded1e5ce5d75814730bb4caaf49419 Method
PD-L1 and PD-1 status was assessed with IHC (AB clone SP142 and SP263 - Ventana, 22C3, 28-8 – Dako and PD-1) on archival FFPE surgical tumor specimens, arrayed on tissue microarrays (TMAs) with duplicate 1 mm cores, from Karolinska University Hospital. All patients (n = 598) underwent curative surgery between 1987 and 2015. The following cases were excluded from survival analysis (n = 89): R1 resection, early post-operative mortality, adjuvant chemo- or radiotherapy. PD-L1 staining was scored as positive if present in > 1% of tumor cells, independently of staining intensity.
4c3880bb027f159e801041b1021e88e8 Result
Patient and tumor characteristics were as follows. Median age (IQR): 68 years (27-89); gender: male/female 54%/46%; histology: squamous-cell carcinoma (SCC)/Non-squamous (N-Sq)-NSCLC/carcinoid 219 (32%)/394 (58%)/45(7%); p-stage: IA/IB/IIA/IIB/IIIA/IIIB 50%/26%/10%/10%/2%/0.2%. PD-L1 28-8 was positive in 11% of cases, Pearson Chi-square p<0.0001). PD-L1 positivity 22C3/SP263/SP142 was 10%/13%/3%. All carcinoids were negative for PD-L1. In NSCLC, PD-L1 positivity for each antibody was associated with tumor size (T1/T2-4; Fisher’s exact test, p<0.001) and grade of differentiation (G1, G2 and G3; p<0.0002). Statistically significant association between PD-L1 expression and OS was only observed using the clone SP263 (log-rank p=0.013). PD-1 expression in TILs correlates with those of PD-L1 (clone 28-8).
8eea62084ca7e541d918e823422bd82e Conclusion
In this surgical series, the clone SP142 showed less PD-L1 expression in the tumor cells. PD-L1 status was associated with tumor size, grading and only the clone SP263 showed association between its expression and survival ratio. PD-1 expression in TILs correlates with those of PD-L1.
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