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Y-box binding protein 1 expression in gastric cancer subtypes and association with cancer neovasculature

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Abstract

Purpose

Y-box binding protein 1 (YB-1) expression in cancer cells is closely associated with malignant progression and poor prognosis in various cancers. Recently, we demonstrated that YB-1 expression in cancer cells is an immunomarker for patient prognosis and liver metastasis of gastric cancer (GC), and identified YB-1 as an excellent biomarker of angiogenic and proliferating endothelial cells in cancers. We further explored the expression patterns of YB-1 in gastric vasculature and the relationship with the clinical pathologic characteristics, as well as YB-1 phenotype in cancer cells.

Methods/Patients

Immunohistochemical analysis of YB-1 was performed using 163 surgically resected primary GC specimens.

Results

YB-1 expression in cancer cells significantly differed with respect to Lauren type, JGCA classification, vascular invasion (VI), and microvessel density (MVD) of cancers (P = 0.018, P = 0.002, P < 0.001, and P < 0.001, respectively). No correlation was found between cancer-cell YB-1 expression and TNM stage or lymphatic invasion. However, YB-1 expression in vascular endothelial cells significantly correlated with N stage, M stage, TNM stage, and MVD of cancers (P < 0.001, P = 0.013, P < 0.001, and P < 0.001, respectively). Notably, cases with YB-1 expression in cancer vasculature also demonstrated YB-1 expression in cancer cells (P = 0.040).

Conclusions

YB-1 may promote GC development through its function in both cancer cells and cancer vascular cells, and thus represent a potential biomarker in this disease.

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Acknowledgments

The authors thank Ms. H. Isagai for technical assistance. This study was supported in part by Grants-in-Aid for Scientific Research from the Ministry for Education, Culture, Sports, Science and Technology of Japan (No. 24501323), a University of Occupational and Environmental Health Grant for Advanced Research, and the Vehicle Racing Commemorative Foundation, and a grant from the National Natural Science Foundation of China (No. 81201801).

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Correspondence to K. Kohno.

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Supplemental Fig. Western blot for the exosome-related proteins HLA-A (Santa Cruz, USA; 1:500) and TSG101 (Santa Cruz, USA; 1:500) and YB-1 (1:5000) in cell lysis and exosomes derived from gastric cancer cell line SGC-7901. YB-1 is positive in the cancer-derived exosomes.

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Wu, Y., Wang, KY., Li, Z. et al. Y-box binding protein 1 expression in gastric cancer subtypes and association with cancer neovasculature. Clin Transl Oncol 17, 152–159 (2015). https://doi.org/10.1007/s12094-014-1208-4

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