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Erschienen in: Breast Cancer Research and Treatment 3/2019

10.01.2019 | Review

PD-L1 expression in breast cancer: expression in subtypes and prognostic significance: a systematic review

verfasst von: Elisabeth Specht Stovgaard, Anne Dyhl-Polk, Anne Roslind, Eva Balslev, Dorte Nielsen

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 3/2019

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Abstract

Purpose

To systematically review the literature on the expression of PD-L1 in primary BC, variation of expression between subtypes and effect on overall survival (OS), disease-free survival (DFS), and recurrence-free survival (RFS). Additionally, for studies in the neoadjuvant setting, we have reviewed the ability of PD-L1 to predict pathological complete response (pCR).

Methods

Articles included in this review were retrieved by searching PubMed (1966–2018) and EMBASE (1980–2018). The following search terms were used: “PD-L1 expression” and “breast cancer” (PubMed234; EMBASE 161).

Results

Thirty-seven articles were found relevant to this study. We summarize important findings from these works, and show that the observed PD-L1 expression in the studies varies greatly, with expression rates ranging from 0 to 83% across subtypes. PD-L1 expression in relation to prognosis both in the adjuvant and neoadjuvant chemotherapy setting remains controversial, with studies finding better, worse, or no effect on prognosis. We also show that a wide variety of strategies are used when evaluating PD-L1 immunohistochemically, e.g., different cut-off points, different cell types evaluated, and different perceptions of when a cell is positive for PD-L1 (cytoplasmic vs membrane staining).

Conclusion

Further investigation of PD-L1 expression in breast cancer and its effect on prognosis is required. There is little consensus on the methods used to evaluate PD-L1 expression immunohistochemically, and this may contribute to the diverging results found in this study.
Literatur
Metadaten
Titel
PD-L1 expression in breast cancer: expression in subtypes and prognostic significance: a systematic review
verfasst von
Elisabeth Specht Stovgaard
Anne Dyhl-Polk
Anne Roslind
Eva Balslev
Dorte Nielsen
Publikationsdatum
10.01.2019
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 3/2019
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-019-05130-1

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