The combination of PD-L1 expression and decreased tumorinfiltrating lymphocytes is associated with a poor prognosis in triple-negative breast cancer

Hitomi Mori, Makoto Kubo, Rin Yamaguchi, Reiki Nishimura, Tomofumi Osako, Nobuyuki Arima, Yasuhiro Okumura, Masayuki Okido, Mai Yamada, Masaya Kai, Junji Kishimoto, Yoshinao Oda, Masafumi Nakamura

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

This study included patients with primary triple-negative breast cancer (TNBC) who underwent resection without neoadjuvant chemotherapy between January 2004 and December 2014. Among the 248 TNBCs studied, programmed cell death ligand-1 (PD-L1) expression was detected in 103 (41.5%) tumors, and high levels of tumor-infiltrating lymphocytes (TILs) were present in 118 (47.6%) tumors. PDL1 expression correlated with high levels of TILs, but was not a prognostic factor. Patients with TILs-high tumors had better overall survival than those with TILslow tumors (P = 0.016). There was a strong interaction between PD-L1 expression and TILs that was associated with both recurrence-free survival (P = 0.0018) and overall survival (P = 0.015). Multivariate Cox proportional hazards model analysis showed that PD-L1-positive/TILs-low was an independent negative prognostic factor for both recurrence-free survival and overall survival. Our findings suggest that PDL1- positive/TILs-low tumors are associated with a poor prognosis in patients with TNBC, and that it is important to focus on the combination of PD-L1 expression on tumor cells and TILs present in the tumor microenvironment. These biomarkers may be useful for stratification of TNBCs and for predicting prognosis and developing novel cancer immunotherapies.

Original languageEnglish
Pages (from-to)15584-15592
Number of pages9
JournalOncotarget
Volume8
Issue number9
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Oncology

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