Abstract
Brain metastases (BM) are frequent in small cell lung cancer (SCLC). Novel insights into their pathobiology are needed for development of better therapies. We investigated tumor-infiltrating lymphocyte (TIL) subsets (CD3+, CD8+, CD45RO+, FOXP3+ and PD-1+) and expression of PD-L1 in a series of 32 SCLC BM specimens and four matched primary tumor specimens using immunohistochemistry. 30/32 (93.8 %) BM specimens showed TIL infiltration. CD3+ TILs were observed in 30/32 (93.8 %) BM specimens, CD8+ TILs in 25/32 (78.1 %), CD45RO+ TILs in 15/32 (46.9 %), FOXP3+ TILs in 15/32 (46.9 %) and PD-1+ TILs in 1/32 (3.1 %) BM specimens. Patients with infiltration of CD45RO+ TILS had a significantly longer median survival time (11 months; 95 % CI 0.000–26.148) as compared to patients without the presence of CD45RO+ TILs (5 months; 95 % CI 0.966–9.034; p = 0.007; log rank test). Membranous PD-L1 on tumor cells was observed in 24/32 (75.0 %) BM specimens, with 11/32 (34.4 %) cases showing PD-L1 expression in over 5 % of viable BM tumor cells. PD-L1 expression on TILs was seen in 8/32 (25.0 %) and on tumor infiltrating macrophages in 9/32 (28.1 %) cases. Patients with PD-L1 expression on TILs presented with improved survival prognosis (6 versus 29 months; p = 0.002; log rank test). Among matched primary tumors, all (4/4; 100 %) specimens showed TIL infiltration, while PD-L1 expression found in only 1/4 (25.0 %) specimen. TIL infiltration and PD-L1 expression are commonly found in SCLC BM and presence of CD45RO+ memory T-cells and PD-L1+ TILs in SCLC BM seem to associate with favorable survival times. Our data suggest an active immune microenvironment in SCLC BM that may be targetable by immune-modulating drugs.
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Acknowledgments
We thank Dr. Lieping Chen (Yale) for providing anti-PD-L1 antibody (5H1) for this study. We thank Franziska Vogler, Philip Kresl and Tobias Raymann for excellence technical assistance.
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The costs for this project were covered by the research budget of the Medical University of Vienna and the grant “Initiative Krebsforschung” with the project title “Tumorimmunologie von Hirnmetastasen”.
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11060_2016_2216_MOESM1_ESM.tif
Supplemental Fig. 1: Control tissue staining results A Immunohistochemistry for PD1 in a lymph node (magnification ×200) B Immunohistochemistry for PD1 in placenta (magnification ×200 ). (TIF 10614 KB)
11060_2016_2216_MOESM2_ESM.tif
Supplemental Fig. 2: A PD-L1 expression in macrophages (errors indicate macrophages; magnification ×200 ) B PD-L1 expression in tumor infiltrating lymphocytes (errors indicate TILs; magnification ×200 ) C CD3+ TILs in the same specimen shown in B (magnification ×200 ). (TIF 5907 KB)
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Berghoff, A.S., Ricken, G., Wilhelm, D. et al. Tumor infiltrating lymphocytes and PD-L1 expression in brain metastases of small cell lung cancer (SCLC). J Neurooncol 130, 19–29 (2016). https://doi.org/10.1007/s11060-016-2216-8
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DOI: https://doi.org/10.1007/s11060-016-2216-8