Osteosarcoma and soft-tissue sarcomas with an immune infiltrate express PD-L1: relation to clinical outcome and Th1 pathway activation

Immune checkpoint proteins, such as PD-L1 and PD-1, are important in several cancers; however, their role in osteosarcoma (OSA) and soft tissue sarcoma (STS) remains unclear. Our aims were to determine whether subsets of OSA/STS harbor tumor-infiltrating lymphocytes (TILs) and express PD-L1, and how...

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Published in:	Oncoimmunology Vol. 9; no. 1; p. 1737385
Main Authors:	Wunder, Jay S., Lee, Minji J., Nam, Junghyun, Lau, Beatrice Y., Dickson, Brendan C., Pinnaduwage, Dushanthi, Bull, Shelley B., Ferguson, Peter C., Seto, Andrew, Gokgoz, Nalan, Andrulis, Irene L.
Format:	Journal Article
Language:	English
Published:	United States Taylor & Francis 01-01-2020 Taylor & Francis Group
Subjects:	Adult B7-H1 Antigen - genetics Back Matter Bone Neoplasms Humans osteosarcoma Osteosarcoma - genetics PD-L1 Sarcoma - genetics Soft Tissue Neoplasms - genetics soft tissue sarcoma survival tumor-infiltrating lymphocytes PD-L1 tumor-infiltrating lymphocytes soft tissue sarcoma osteosarcoma survival
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Summary:	Immune checkpoint proteins, such as PD-L1 and PD-1, are important in several cancers; however, their role in osteosarcoma (OSA) and soft tissue sarcoma (STS) remains unclear. Our aims were to determine whether subsets of OSA/STS harbor tumor-infiltrating lymphocytes (TILs) and express PD-L1, and how PD-L1 expression is related to clinical outcome. Tissue sections of 25 cases each of untreated undifferentiated pleomorphic sarcoma (UPS), myxofibrosarcoma (MFS), liposarcoma (LPS) and 24 of leiomyosarcoma (LMS) were subjected to immunohistochemistry (IHC) for immune cells, PD-L1 and PD-1. RT-qPCR was utilized to quantify levels of PD-L1 mRNA from 33 UPS, 57 MFS and 79 OSA primary-untreated specimens. PD-L1 mRNA levels were tested for their correlation with overall survival in patients presenting without metastases. Transcriptome analysis evaluated biological pathway differences between high and low PD-L1 expressers. A subset of UPS and MFS contained TILs and expressed PD-L1 and PD-1; LMS and LPS did not. PD-L1 levels by IHC and RT-qPCR were positively correlated. PD-L1 over-expression was associated with better survival for UPS and OSA, but not MFS. The Th1 pathway was significantly activated in UPS with high levels of PD-L1 and improved survival. Some sarcoma subtypes harbor TILs and express PD-L1. Patients with UPS and OSA with high levels of PD-L1 had better overall survival than those with low expression levels. Important biological pathways distinguish PD-L1 high and low groups. The stratification of patients with OSA/STS with respect to potential immune therapies may be improved through investigation of the expression of immune cells and checkpoint proteins.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2162-402X 2162-4011 2162-402X
DOI:	10.1080/2162402X.2020.1737385