Abstract
Purpose
Integrins, transmembrane receptors that mediate cell-extracellular matrix and cell-cell interactions, have been linked to several cancer-associated features. A less explored function of integrins in cancer is their role in leukocyte homing and activation. Understanding their relationship with immune cell infiltrates and immune checkpoints is an area of interest in cancer research.
Methods
The expression of 33 different integrins was evaluated in relation with breast cancer patient outcome using transcriptomic data (Affymetrix dataset, exploratory cohort) and the METABRIC study (validation cohort). The TIMER online tool was used to assess the association of the identified integrin genes with immune cell infiltration, and the TCGA and METABRIC studies to assess correlations between integrin gene expression and genomic signatures of immune activation.
Results
We identified 7 genes coding for integrin α and β subunits, i.e., ITGA4, ITGB2, ITGAX, ITGB7, ITGAM, ITGAL and ITGA8, which predict a favorable prognosis in Basal-like and HER2+ breast cancers. Their expression positively correlated with the presence of immune cell infiltrates within the tumor (dendritic cells, CD4+ T-cells, neutrophils, CD8+ T-cells and B-cells), with markers of T-cell activation and antigen presentation, and with gene signatures of immune surveillance (cytotoxic T lymphocyte activation and IFN gamma signature). By contrast, we found that genes coding for integrins that predicted a detrimental outcome (IBSP, ITGB3BP, ITGB6, ITGB1 and ITGAV) were not associated with any of these parameters.
Conclusions
We identified an integrin signature composed of 7 genes with potential to recognize immune infiltrated and activated Basal-like and HER2+ breast cancers with a favorable prognosis.
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Data availability
Data are available upon reasonable request.
Abbreviations
- APC:
-
antigen presenting cell
- CI:
-
confidence interval
- CTL:
-
cytotoxic T lymphocyte
- DC:
-
dendritic cells
- ECM:
-
extracellular matrix
- FDR:
-
false discovery rate
- HR:
-
hazard ratio
- ICAM:
-
intercellular adhesion molecule
- IFN:
-
Interferon
- KM:
-
Kaplan-Meier
- LAD:
-
leukocyte adhesion deficiency
- LFA:
-
leukocyte function-associated antigen 1
- NK:
-
natural killer
- OS:
-
overall survival
- P:
-
p-value
- PD-1:
-
programmed cell death protein-1
- PD-L1:
-
programmed cell death protein ligand-1
- RFS:
-
relapse-free survival
- TGF-β:
-
transforming growth factor β
- TIMER:
-
Tumor Immune Estimation Resource
- VCAM-1:
-
vascular intercellular adhesion molecule 1
- VLA-4:
-
very late antigen 4
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Funding
This work was supported by the Instituto de Salud Carlos III (PI19/00808), ACEPAIN, Diputación de Albacete, CIBERONC and CRIS Cancer Foundation (to A. Ocaña) and the Ministry of Economy and Competitiveness of Spain (BFU2015-71371-R), the Instituto de Salud Carlos III through the Spanish Cancer Centers Network Program (RD12/0036/0003) and CIBERONC, the scientific foundation of the AECC and the CRIS Foundation (to A. Pandiella). Our laboratories receive support from the European Community through the regional development funding program (FEDER). BG was supported by a 2018 − 2.1.17-TET-KR-00001 grant and by the Higher Education Institutional Excellence Programme (2020 − 4.1.1.-TKP2020) of the Ministry for Innovation and Technology of Hungary, within the framework of the Bionic thematic programme of the Semmelweis University.
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K.R., M.B.P. and A.O. conceived and designed the study. K.R., M.B.P., A.M., C.S.L and B.G. searched the data and performed the analyses. M.B.P., A.O., K.R., A.M., C.S.L, V.G.B, F.C., P.P.S, A.P. and B.G wrote the manuscript. All authors reviewed, included modifications and approved the final version of the manuscript.
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A.O. receives funding from Entrechem, travel expenses from Merck and advisory board fees from Daiichi Sankyo. P.P.S. receives funding from Merck and MSD. A.P. receives consultancy fees from Daiichi Sankyo.
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Rojas, K., Baliu-Piqué, M., Manzano, A. et al. In silico transcriptomic mapping of integrins and immune activation in Basal-like and HER2+ breast cancer. Cell Oncol. 44, 569–580 (2021). https://doi.org/10.1007/s13402-020-00583-9
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DOI: https://doi.org/10.1007/s13402-020-00583-9