1. Clinical impact of programmed cell death ligand 1 expression in colorectal cancer.
- Author
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Droeser RA, Hirt C, Viehl CT, Frey DM, Nebiker C, Huber X, Zlobec I, Eppenberger-Castori S, Tzankov A, Rosso R, Zuber M, Muraro MG, Amicarella F, Cremonesi E, Heberer M, Iezzi G, Lugli A, Terracciano L, Sconocchia G, Oertli D, Spagnoli GC, and Tornillo L
- Subjects
- Adult, Aged, Aged, 80 and over, CD8-Positive T-Lymphocytes metabolism, Colonic Neoplasms metabolism, Female, Humans, Kaplan-Meier Estimate, Lymphocytes, Tumor-Infiltrating metabolism, Male, Middle Aged, Prognosis, Rectal Neoplasms metabolism, Tissue Array Analysis, Antigens, Neoplasm metabolism, B7-H1 Antigen metabolism, Biomarkers, Tumor metabolism, Colonic Neoplasms mortality, DNA Mismatch Repair physiology, Rectal Neoplasms mortality
- Abstract
Background: Programmed cell death 1 (PD-1) receptor triggering by PD ligand 1 (PD-L1) inhibits T cell activation. PD-L1 expression was detected in different malignancies and associated with poor prognosis. Therapeutic antibodies inhibiting PD-1/PD-L1 interaction have been developed., Materials and Methods: A tissue microarray (n=1491) including healthy colon mucosa and clinically annotated colorectal cancer (CRC) specimens was stained with two PD-L1 specific antibody preparations. Surgically excised CRC specimens were enzymatically digested and analysed for cluster of differentiation 8 (CD8) and PD-1 expression., Results: Strong PD-L1 expression was observed in 37% of mismatch repair (MMR)-proficient and in 29% of MMR-deficient CRC. In MMR-proficient CRC strong PD-L1 expression correlated with infiltration by CD8(+) lymphocytes (P = 0.0001) which did not express PD-1. In univariate analysis, strong PD-L1 expression in MMR-proficient CRC was significantly associated with early T stage, absence of lymph node metastases, lower tumour grade, absence of vascular invasion and significantly improved survival in training (P = 0.0001) and validation (P = 0.03) sets. A similar trend (P = 0.052) was also detectable in multivariate analysis including age, sex, T stage, N stage, tumour grade, vascular invasion, invasive margin and MMR status. Interestingly, programmed death receptor ligand 1 (PDL-1) and interferon (IFN)-γ gene expression, as detected by quantitative reverse transcriptase polymerase chain reaction (RT-PCR) in fresh frozen CRC specimens (n = 42) were found to be significantly associated (r = 0.33, P = 0.03)., Conclusion: PD-L1 expression is paradoxically associated with improved survival in MMR-proficient CRC., (Copyright © 2013 Elsevier Ltd. All rights reserved.)
- Published
- 2013
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