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Article Open Access

Significance of CD47 expression in gastric cancer

  • Authors:
    • Tomoya Sudo
    • Yusuke Takahashi
    • Genta Sawada
    • Ryutaro Uchi
    • Koshi Mimori
    • Yoshito Akagi
  • View Affiliations / Copyright

    Affiliations: Department of Surgery, Kurume University School of Medicine, Kurume, Fukuoka 830‑0011, Japan, Department of Surgical Oncology, Osaka University, Graduate School of Medicine, Suita, Osaka 565‑0871, Japan, Department of Surgery and Molecular Oncology, Medical Institute of Bioregulation, Kyushu University, Beppu, Oita 847‑0838, Japan
    Copyright: © Sudo et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 801-809
    |
    Published online on: May 26, 2017
       https://doi.org/10.3892/ol.2017.6257
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Abstract

Integrin-associated protein (CD47) is ubiquitously expressed on the surface of cells and functions as an identifier of self. In blood cancer, tumor cells expressing CD47 evade phagocytosis by macrophages, leading to a poor patient prognosis. However, the status of CD47 expression in solid tumors, particularly in gastric cancer, is not well understood. The purpose of the present study was to examine the level of CD47 in the primary tumor, peripheral blood (PB) and bone marrow (BM) of patients with gastric cancer, and to determine its effect. Reverse transcription-quantitative polymerase chain reaction analysis was performed to determine the level of CD47 mRNA expression in primary tumor, PB and BM samples collected from 168 patients with gastric cancer. Cell sorting was performed to investigate CD47 protein expression in PB and BM fractions, and to identify the source of CD47 expression. In primary tumors, the expression of CD47 was not associated with any clinicopathological factors or prognosis. By contrast, in PB, the low CD47 expression group demonstrated a significantly increased tumor size, and frequency of lymphatic invasion and lymph node metastasis, compared with the high CD47 expression group. In addition, the clinical tumor stage of the low CD47 expression group was significantly increased compared with that of the high CD47 expression group. Conversely, in PB, the high CD47 expression group had a significantly higher frequency of lymphatic invasion and lymph node metastasis compared with the low CD47 expression group. The lymphocyte fraction exhibited the highest CD47 expression compared with the other fractions in PB and BM samples. Low expression of CD47 was associated with the advancement of gastric cancer, in contrast to other cancers, and it may be associated with a decrease in lymphocytes during later stages. These results indicate that CD47 expression in the PB and BM may serve as a marker to analyze the immunological function of patients with gastric cancer; however, the significance of CD47 in gastric cancer requires further study.
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Copy and paste a formatted citation
Spandidos Publications style
Sudo T, Takahashi Y, Sawada G, Uchi R, Mimori K and Akagi Y: Significance of CD47 expression in gastric cancer. Oncol Lett 14: 801-809, 2017.
APA
Sudo, T., Takahashi, Y., Sawada, G., Uchi, R., Mimori, K., & Akagi, Y. (2017). Significance of CD47 expression in gastric cancer. Oncology Letters, 14, 801-809. https://doi.org/10.3892/ol.2017.6257
MLA
Sudo, T., Takahashi, Y., Sawada, G., Uchi, R., Mimori, K., Akagi, Y."Significance of CD47 expression in gastric cancer". Oncology Letters 14.1 (2017): 801-809.
Chicago
Sudo, T., Takahashi, Y., Sawada, G., Uchi, R., Mimori, K., Akagi, Y."Significance of CD47 expression in gastric cancer". Oncology Letters 14, no. 1 (2017): 801-809. https://doi.org/10.3892/ol.2017.6257
Copy and paste a formatted citation
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Spandidos Publications style
Sudo T, Takahashi Y, Sawada G, Uchi R, Mimori K and Akagi Y: Significance of CD47 expression in gastric cancer. Oncol Lett 14: 801-809, 2017.
APA
Sudo, T., Takahashi, Y., Sawada, G., Uchi, R., Mimori, K., & Akagi, Y. (2017). Significance of CD47 expression in gastric cancer. Oncology Letters, 14, 801-809. https://doi.org/10.3892/ol.2017.6257
MLA
Sudo, T., Takahashi, Y., Sawada, G., Uchi, R., Mimori, K., Akagi, Y."Significance of CD47 expression in gastric cancer". Oncology Letters 14.1 (2017): 801-809.
Chicago
Sudo, T., Takahashi, Y., Sawada, G., Uchi, R., Mimori, K., Akagi, Y."Significance of CD47 expression in gastric cancer". Oncology Letters 14, no. 1 (2017): 801-809. https://doi.org/10.3892/ol.2017.6257
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