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Lymphocyte-Activation Gene-3 Expression and Prognostic Value in Neoadjuvant-Treated Triple-Negative Breast Cancer

Overview
Journal J Breast Cancer
Date 2018 Jul 3
PMID 29963107
Citations 38
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Abstract

Purpose: In this study, we aimed to evaluate lymphocyte-activation gene-3 (LAG-3) expression and its prognostic value in neoadjuvant-treated triple-negative breast cancer (TNBC).

Methods: LAG-3, programmed death-1 (PD-1), programmed death ligand-1 (PD-L1), and CD8 tumor-infiltrating lymphocyte (TILs) levels were examined using immunohistochemistry in 148 preand 114 post-neoadjuvant chemotherapy (NACT) specimens of human TNBC tissue. Correlations between expression levels and clinicopathological features were analyzed. Prognostic values for combined detection in TNBC following NACT were evaluated.

Results: In pre-NACT specimens, LAG-3 expression showed a significant association with pathological complete response (pCR, =0.038) and was correlated with PD-1 (<0.001) and PD-L1 (=0.008). In post-NACT specimens, high expression of LAG-3 showed significant effects on nodal status (=0.023) and PD-1 (<0.001). The expression of immune markers on TILs significantly increased following NACT. Multivariate analysis indicated that only nodal status (odds ratio [OR], 0.226; 95% confidence interval [CI], 0.079-0.644; =0.005) and high quantities of CD8TILs (OR, 3.186; 95% CI, 1.314-7.721; =0.010) are independent predictors of pCR. Nodal status (hazard ratio [HR], 2.666; 95% CI, 1.271-5.594; =0.010), CD8TILs (HR, 0.313; 95% CI, 0.139-0.705; =0.005), and the LAG-3-high/PD-L1-high group (HR, 2.829; 95% CI, 1.050-7.623; =0.040) provided prognostic values for patients with TNBC following NACT.

Conclusion: CD8TILs were sensitive predictive markers in response to NACT. High expression of LAG-3 in residual tissues, especially in combination with PD-L1, was associated with poor prognosis.

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