Abstract
Purpose
Trophoblast Cell Surface Antigen 2 (TROP2) is a glycoprotein expressed in many cancers. A TROP2 antibody–drug conjugate (ADC) was effective in metastatic triple-negative breast cancer (TNBC). We studied TROP2 gene (TACSTD2) expression and associations with tumor and clinical characteristics, as well as selected external genes in primary breast cancer.
Methods
TACSTD2 gene expression was evaluated using microarray data from I-SPY 1 (n = 149), METABRIC (n = 1992), and TCGA (n = 817). Associations with clinical features (Kruskal–Wallis test, all datasets), chemotherapy response (Wilcoxon rank sum test, I-SPY 1), recurrence free survival (Cox proportional hazard model, I-SPY 1 and METABRIC), and selected genes (Pearson correlations, all datasets) were determined.
Results
TACSTD2 gene expression was detectable in all breast cancer subtypes, with a wide range of expression (all datasets). TACSTD2 gene expression was lower in HER2 + than HR + /HER2- and TNBC (METABRIC: p = 0.03, TCGA p = 0.007), and in HER2 + enriched and luminal B breast cancer (METABRIC: p < 0.001, TCGA: p < 0.001). TACSTD2 expression was higher in grade I vs. II/III tumors (METABRIC: p < 0.001). No association with chemotherapy response (I-SPY 1) or recurrence free survival (I-SPY 1 and METABRIC) was seen. TACSTD2 has significant positive correlations with the expression of epithelial/adhesion genes and proliferative genes, but was inversely correlated with immune genes.
Conclusion
TACSTD2 gene expression was seen in all breast cancer subtypes particularly luminal A and TNBC, and correlated with the expression of genes involved in cell epithelial transformation, adhesion, and proliferation, which contribute to tumor growth. These results support the investigation of TROP2 ADC in all subtypes of breast cancer.
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Data availability
All of the datasets used for this study (I-SPY 1, METABRIC, and TCGA) are publically available. I-SPY 1 datasets were accessed through NCBI Gene Expression Omnibus (GEO) (https://identifiers.org/geo:GSE22226), METABRIC data through European Genome-phenome Archive (EGA) (https://identifiers.org/ega.dataset:EGAD00010000210 and https://identifiers.org/ega.dataset:EGAD00010000211), and TCGA data via cBioPortal for CancerGenomics (https://identifiers.org/cbioportal:brca_tcga_pub2015).
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Acknowledgements
The authors would like to acknowledge the I-SPY 1 study participants and staff. While this study was not funded, the I-SPY 1 clinical trial (CALGB 150007/150012; ACRIN 6657) was funded through the Alliance grant U10CA180821.
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NV: Research support (not related to this work) for clinical trials to the institution (MGH): Pfizer, Daehwa, Radius, Merck, Novartis. Advisory Board participation (single session, not related to this work): OncoSec, AbbVie, and Gilead. CY: Research funding (not related to this work) to the institution (UCSF): NCI and Quantum Leap Healthcare Collaborative.HSR: Research support (not related to this work) for clinical trials through the University of California: Pfizer, Merck, Novartis, Lilly, Roche, Odonate, Daiichi, Seattle Genetics, Macrogenics, Sermonix, Astra Zeneca, OBI, Gilead, Ayala. Honoraria (not related to this work): Puma, Samsung, Napo.
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Vidula, N., Yau, C. & Rugo, H. Trophoblast Cell Surface Antigen 2 gene (TACSTD2) expression in primary breast cancer. Breast Cancer Res Treat 194, 569–575 (2022). https://doi.org/10.1007/s10549-022-06660-x
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DOI: https://doi.org/10.1007/s10549-022-06660-x