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Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma

  • Authors:
    • Pengcheng Zhong
    • Rong Shu
    • Huiwen Wu
    • Zhiwen Liu
    • Xiaoling Shen
    • Yingjie Hu
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    Affiliations: Laboratory of Herbal Drug Discovery, Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510405, P.R. China
    Copyright: © Zhong et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 305
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    Published online on: January 29, 2021
       https://doi.org/10.3892/etm.2021.9736
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Abstract

Although keratin 15 (KRT15) has been indicated to be overexpressed in several types of tumor, its role in breast invasive carcinoma (BRCA) has so far remained elusive. The aim of the present study was to explore KRT15 expression in BRCA based on data obtained from The Cancer Genome Atlas and The Genotype‑Tissue Expression. KRT15 expression was compared using a Wilcoxon rank‑sum test. Functional enrichment analysis was performed to reveal the biological roles and pathways of KRT15. The association between KRT15 expression and immune‑cell infiltration was evaluated via single‑sample gene set enrichment analysis (ssGSEA). To investigate the relationship between clinicopathological features and KRT15 expression, the prognostic value of KRT15 and other clinical factors was evaluated using Cox regression analysis and Kaplan‑Meier (KM) plots. Subgroup prognostic analysis was also performed using forest plots and KM curves. Finally, a tissue microarray was used to assess KRT15 expression in BRCA tissues. KRT15 expression was significantly lower in BRCA tissues compared with that in normal tissues. Functional enrichment analysis suggested that KRT15‑related genes were primarily enriched in the transmembrane transporter complex, cornification and ligand‑receptor interactions. Increased KRT15 was associated with several tumor‑suppressive pathways. ssGSEA revealed that high KRT15 expression was significantly associated with natural killer‑cell, B‑cell and mast‑cell infiltration. Significant associations were observed between low KRT15 expression and advanced stage clinicopathological factors, as well as unfavorable overall survival (OS) and disease‑specific survival. Multivariate Cox regression analysis suggested that KRT15 was an independent prognostic factor for OS (P=0.039; hazard ratio, 0.590; 95% CI, 0.358‑0.974). Subgroup prognostic analysis demonstrated that low KRT15 was a reliable predictor of poor OS. Immunohistochemistry of a tissue microarray indicated that positive KRT15 expression rates were significantly higher in normal tissues compared with those in the BRCA tissues. In conclusion, low KRT15 expression was significantly associated with poor prognosis in patients with BRCA. Thus, KRT15 may serve an important role in BRCA progression and may be used as a promising prognostic marker for diagnostic and prognostic analyses in patients with BRCA.
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Spandidos Publications style
Zhong P, Shu R, Wu H, Liu Z, Shen X and Hu Y: Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma. Exp Ther Med 21: 305, 2021.
APA
Zhong, P., Shu, R., Wu, H., Liu, Z., Shen, X., & Hu, Y. (2021). Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma. Experimental and Therapeutic Medicine, 21, 305. https://doi.org/10.3892/etm.2021.9736
MLA
Zhong, P., Shu, R., Wu, H., Liu, Z., Shen, X., Hu, Y."Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma". Experimental and Therapeutic Medicine 21.4 (2021): 305.
Chicago
Zhong, P., Shu, R., Wu, H., Liu, Z., Shen, X., Hu, Y."Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma". Experimental and Therapeutic Medicine 21, no. 4 (2021): 305. https://doi.org/10.3892/etm.2021.9736
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Spandidos Publications style
Zhong P, Shu R, Wu H, Liu Z, Shen X and Hu Y: Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma. Exp Ther Med 21: 305, 2021.
APA
Zhong, P., Shu, R., Wu, H., Liu, Z., Shen, X., & Hu, Y. (2021). Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma. Experimental and Therapeutic Medicine, 21, 305. https://doi.org/10.3892/etm.2021.9736
MLA
Zhong, P., Shu, R., Wu, H., Liu, Z., Shen, X., Hu, Y."Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma". Experimental and Therapeutic Medicine 21.4 (2021): 305.
Chicago
Zhong, P., Shu, R., Wu, H., Liu, Z., Shen, X., Hu, Y."Low KRT15 expression is associated with poor prognosis in patients with breast invasive carcinoma". Experimental and Therapeutic Medicine 21, no. 4 (2021): 305. https://doi.org/10.3892/etm.2021.9736
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