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BMC Cancer
Published in: BMC Cancer 1/2016

Open Access 01-12-2016 | Research article

Prognostic implications of PD-L1 expression in patients with soft tissue sarcoma

Authors: Chan Kim, Eun Kyung Kim, Hun Jung, Hong Jae Chon, Jung Woo Han, Kyoo-Ho Shin, Hyuk Hu, Kyung Sik Kim, Young Deuk Choi, Sunghoon Kim, Young Han Lee, Jin-Suck Suh, Joong Bae Ahn, Hyun Cheol Chung, Sung Hoon Noh, Sun Young Rha, Soo Hee Kim, Hyo Song Kim

Published in: BMC Cancer | Issue 1/2016

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Abstract

Background

The PD-1/PD-L1 axis plays a paramount role in the immune escape of tumor cells by negative regulation of T-cell functions. The aim of the present study was to characterize the PD-L1 expression pattern and its clinical implication in soft-tissue sarcomas (STS).

Methods

We analyzed PD-L1 expression in 82 STS patients with 5 subtypes: rhabdomyosarcoma, synovial sarcoma, Ewing sarcoma, epithelioid sarcoma, and mesenchymal chondrosarcoma.

Results

The median age at diagnosis was 26 (range: 1–78) and the male to female ratio was 1.6. The majority (80 %) of patients showed locoregional disease rather than metastatic disease at diagnosis. Thirty-five cases (43 %) showed PD-L1 expression and the proportion of PD-L1 expression was significantly different according to histologic subtypes (P = 0.004); highest in epithelioid sarcoma (100 %, 7/7), followed by synovial sarcoma (53 %, 10/19), rhabdomyosarcoma (38 %, 12/32), and Ewing sarcoma (33 %, 6/18), while it was not expressed in mesenchymal chondrosarcoma (0 %, 0/6). STS patients with PD-L1 expression had worse overall survival compared with those without PD-L1 expression (5-year survival rate: 48 % vs. 68 %, P = 0.015). The Cox proportional hazard model adjusted for histologic subtype, initial metastasis, and PD-L1 expression showed that PD-L1 expression was significantly associated with shorter overall survival (P = 0.037, HR 2.57, 95 % CI 1.060–6.231).

Conclusion

We have confirmed PD-L1 expression in various STS of young population and demonstrated its independent negative prognostic role, thereby suggesting the PD-1/PD-L1 axis as a potential therapeutic target for the treatment of young STS patients.
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Metadata
Title
Prognostic implications of PD-L1 expression in patients with soft tissue sarcoma
Authors
Chan Kim
Eun Kyung Kim
Hun Jung
Hong Jae Chon
Jung Woo Han
Kyoo-Ho Shin
Hyuk Hu
Kyung Sik Kim
Young Deuk Choi
Sunghoon Kim
Young Han Lee
Jin-Suck Suh
Joong Bae Ahn
Hyun Cheol Chung
Sung Hoon Noh
Sun Young Rha
Soo Hee Kim
Hyo Song Kim
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2016
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-016-2451-6

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