The combined expression of solute carriers is associated with a poor prognosis in highly proliferative ER+ breast cancer

El Ansari, R., Craze, M.L., Alfarsi, L., Soria, D., Diez-Rodriguez, M., Nolan, C.C., Ellis, I.O., Rakha, E.A. and Green, A.R. 2019. The combined expression of solute carriers is associated with a poor prognosis in highly proliferative ER+ breast cancer. Breast Cancer Research and Treatment. 175 (1), pp. 27-38. https://doi.org/10.1007/s10549-018-05111-w

TitleThe combined expression of solute carriers is associated with a poor prognosis in highly proliferative ER+ breast cancer
TypeJournal article
AuthorsEl Ansari, R.
Craze, M.L.
Alfarsi, L.
Soria, D.
Diez-Rodriguez, M.
Nolan, C.C.
Ellis, I.O.
Rakha, E.A.
Green, A.R.
Abstract

Purpose: Breast cancer (BC) is a heterogeneous disease characterised by variant biology, metabolic activity, and patient outcome. Glutamine availability for growth and progression of BC is important in several BC subtypes. This study aimed to evaluate the biological and prognostic role of the combined expression of key glutamine transporters, SLC1A5, SLC7A5 and SLC3A2 in BC with emphasis on the intrinsic molecular subtypes.
Methods: SLC1A5, SLC7A5 and SLC3A2 were assessed at the protein level, using immunohistochemistry on tissue microarrays constructed from a large well characterised BC cohort (n=2,248). Patients were stratified into accredited clusters based on protein expression and correlated with clinicopathological parameters, molecular subtypes, and patient outcome.
Results: Clustering analysis of SLC1A5, SLC7A5 and SLC3A2 identified three clusters Low SLCs (SLC1A5-/SLC7A5-/SLC3A2-), High SLC1A5 (SLC1A5+/SLC7A5-/SLC3A2-) and High SLCs (SLC1A5+/SLC7A5+/SLC3A2+) which had distinct correlations to known prognostic factors and patient outcome (p<0.001). The key regulator of tumour cell metabolism, c-MYC, was significantly expressed in tumours in the High SLCs cluster (p<0.001). When different BC subtypes were considered, the association with the poor outcome was observed in the ER+ high proliferation/luminal B class only (p= 0.003). In multivariate analysis, SLC clusters were independent risk factor for shorter breast cancer specific survival (p= 0.001).
Conclusion: The co-operative expression of SLC1A5, SLC7A5 and SLC3A2 appears to play a role in the aggressive subclass of ER+ high proliferation/ luminal BC, driven by c-MYC, and therefore have the potential to act as therapeutic targets, particularly in synergism.

KeywordsSLC1A5, SLC7A5, SLC3A2, clusters, breast cancer, prognosis
JournalBreast Cancer Research and Treatment
Journal citation175 (1), pp. 27-38
ISSN0167-6806
Year2019
PublisherSpringer
Accepted author manuscript
Digital Object Identifier (DOI)https://doi.org/10.1007/s10549-018-05111-w
Publication dates
Published online22 Jan 2019
Published in printMay 2019

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