Platelets surrounding primary tumor cells are related to chemoresistance

  • Authors:
    • Satoko Ishikawa
    • Tomoharu Miyashita
    • Masafumi Inokuchi
    • Hironori Hayashi
    • Katsunobu Oyama
    • Hidehiro Tajima
    • Hironori Takamura
    • Itasu Ninomiya
    • A. Karim Ahmed
    • John W. Harman
    • Sachio Fushida
    • Tetsuo Ohta
  • View Affiliations

  • Published online on: June 22, 2016     https://doi.org/10.3892/or.2016.4898
  • Pages: 787-794
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Abstract

Platelets are crucial components of the tumor microenvironment that function to promote tumor progression and metastasis. In the circulation, the interaction between tumor cells and platelets increases invasiveness, protects tumor cells from shear stress and immune surveillance, and facilitates tumor cell extravasation to distant sites. However, the role and presence of platelets in the primary tumor have not been fully determined. Here, we investigated the presence of platelets around breast cancer primary tumor cells and the associations between these cells. We further investigated the associations among platelets, tumor cells, chemoresistance, and epithelial-mesenchymal transition (EMT). We retrospectively analyzed data from 74 patients with human epidermal growth factor receptor 2 (HER2)‑negative breast cancer who underwent biopsies before treatment and subsequent neo-adjuvant chemotherapy. In biopsy specimens, we evaluated the expression of platelet-specific markers and EMT markers using immunohistochemistry. The associations among the expression of platelet‑specific markers in biopsy specimens, EMT, response to neo‑adjuvant chemotherapy, and survival were analyzed. The presence of platelets was observed in 44 out of 74 (59%) primary breast cancer biopsy specimens. Platelet‑positive tumor cells showed EMT‑like morphological changes and EMT marker expression. Primary tumor cells associated with platelets were less responsive to neo‑adjuvant chemotherapy (pCR rate: 10 vs. 50%, respectively; p=0.0001). Platelets were an independent predictor of the response to chemotherapy upon multivariable analysis (p<0.0001). In conclusion, there was a significant association between platelets surrounding primary tumor cells in the biopsy specimens and the chemotherapeutic response in breast cancer. Platelets surrounding primary tumor cells may represent novel predictors of chemotherapeutic responses.
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August-2016
Volume 36 Issue 2

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Ishikawa S, Miyashita T, Inokuchi M, Hayashi H, Oyama K, Tajima H, Takamura H, Ninomiya I, Ahmed AK, Harman JW, Harman JW, et al: Platelets surrounding primary tumor cells are related to chemoresistance. Oncol Rep 36: 787-794, 2016
APA
Ishikawa, S., Miyashita, T., Inokuchi, M., Hayashi, H., Oyama, K., Tajima, H. ... Ohta, T. (2016). Platelets surrounding primary tumor cells are related to chemoresistance. Oncology Reports, 36, 787-794. https://doi.org/10.3892/or.2016.4898
MLA
Ishikawa, S., Miyashita, T., Inokuchi, M., Hayashi, H., Oyama, K., Tajima, H., Takamura, H., Ninomiya, I., Ahmed, A. K., Harman, J. W., Fushida, S., Ohta, T."Platelets surrounding primary tumor cells are related to chemoresistance". Oncology Reports 36.2 (2016): 787-794.
Chicago
Ishikawa, S., Miyashita, T., Inokuchi, M., Hayashi, H., Oyama, K., Tajima, H., Takamura, H., Ninomiya, I., Ahmed, A. K., Harman, J. W., Fushida, S., Ohta, T."Platelets surrounding primary tumor cells are related to chemoresistance". Oncology Reports 36, no. 2 (2016): 787-794. https://doi.org/10.3892/or.2016.4898