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Kinesin family member-18A (KIF18A) is a predictive biomarker of poor benefit from endocrine therapy in early ER+?breast cancer

Alfarsi, Lutfi H.; Elansari, Rokaya; Toss, Michael S.; Diez-Rodriguez, Maria; Nolan, Christopher C.; Ellis, Ian O.; Rakha, Emad A.; Green, Andrew R.

Kinesin family member-18A (KIF18A) is a predictive biomarker of poor benefit from endocrine therapy in early ER+?breast cancer Thumbnail


Lutfi H. Alfarsi

Rokaya Elansari

Michael S. Toss

Maria Diez-Rodriguez

Christopher C. Nolan

Professor of Breast Cancer Pathology


PURPOSE: Identification of effective and reliable biomarkers that could be used to predict the efficacy of endocrine therapy is of crucial importance to the management of oestrogen receptor positive (ER+) breast cancer (BC). KIF18A, a key regulator of cell cycle, is overexpressed in many human cancers, including BC. In this study, we investigated the role of KIF18A as a biomarker to predict the benefit from endocrine treatment in early ER?+?BC patients.
METHODS: KIF18A expression was assessed at the genomic level using the METABRIC dataset to explore its prognostic and predictive value in ER?+?BC patients (n?=?1506). Predictive significance of KIF18A mRNA was validated using KM-Plot datasets (n?=?2061). KIF18A protein expression was assessed using immunohistochemistry in a large annotated series of early-stage ER?+?BC (n?=?1592) with long-term follow-up.
RESULTS: High mRNA and protein expression of KIF18A were associated with short recurrence-free survival (RFS), distant-metastasis free survival (DMFS) and BC specific survival (all P? less than 0.05) in ER?+?BC in patients who received no adjuvant treatment or adjuvant endocrine therapy. In multivariate analysis, high KIF18A expression was an independent prognostic biomarker for poor RFS (P?=?0.027) and DMFS (P?=?0.028) in patients treated with adjuvant endocrine therapy.
Conclusion: KIF18A appears to be a candidate biomarker of a subgroup of ER?+?BC characterised by poor clinical outcome. High KIF18A expression has prognostic significance to predict poor benefit from endocrine treatment for patients with ER?+?BC. Therefore, measurement of KIF18A on ER?+?BC patients prior to treatment could guide clinician decision on benefit from endocrine therapy.

Journal Article Type Article
Acceptance Date Sep 29, 2018
Online Publication Date Oct 10, 2018
Publication Date Oct 10, 2018
Deposit Date Oct 12, 2018
Publicly Available Date Oct 11, 2019
Journal Breast Cancer Research and Treatment
Print ISSN 0167-6806
Electronic ISSN 1573-7217
Publisher BMC
Peer Reviewed Peer Reviewed
Keywords Cancer Research; Oncology
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