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Significant relationship between the LAT1 expression pattern and chemoresistance in ovarian clear cell carcinoma

  • Kimiya Sato
  • Morikazu Miyamoto
  • Masashi Takano
  • Kenichi Furuya
  • Hitoshi Tsuda
Original Article
  • 5 Downloads

Abstract

L-type amino acid transporter 1 (LAT1) is a Na+-independent neutral amino acid transporter that plays a key role in cancer cell growth and survival. To determine the significance of LAT1 in prognosis and resistance to chemotherapy in ovarian carcinoma, we investigated the LAT1 expression in 245 ovarian carcinoma patients by immunohistochemistry using tissue microarray. High expression of LAT1 was detected in 85 (34.7%) patients. The ratio of high expression of LAT1 was significantly high in clear cell carcinoma and low in serous carcinoma compared to other histological types (P < 0.0001). High expression of LAT1 in ovarian carcinoma was associated with poorer prognosis as per log-rank test (P = 0.008). Cox’s univariate and multivariate analysis revealed that high expression of LAT1 is an independent marker indicating poor prognosis (hazard ratio = 2.810, P < 0.0001) as well as the FIGO stage III/IV (vs. I/II) and suboptimal surgery. High LAT1 expression was also found to be associated with resistance to chemotherapy (P = 0.016) notably in clear cell carcinoma. In conclusion, we demonstrate that LAT1 is not only associated with poor prognosis of ovarian carcinoma, but also associated with chemoresistance in ovarian carcinoma.

Keywords

Ovarian cancer LAT1 Transporter Immunohistochemistry Chemotherapy 

Notes

Acknowledgments

The authors would appreciate Chinami Onuma for her excellent technical assistance, and Editage (www.editage.jp) for English language editing.

Contributions

Kimiya Sato, Morikazu Miyamoto, Masashi Takano, Kenichi Furuya, and Hitoshi Tsuda conceived and designed the study, and wrote, edited, and reviewed the manuscript. Kimiya Sato and Hitoshi Tsuda researched and analyzed data. All authors gave final approval for publication. Kimiya Sato takes full responsibility for the work as a whole, including the study design, access to data, and the decision to submit and publish the manuscript.

Compliance with ethical standards

The research protocol was approved by the Institutional Ethical Review Board Committee of the National Defense Medical College, Tokorozawa, Japan. Informed consent was obtained from all the individuals included in this study.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Basic PathologyNational Defense Medical CollegeTokorozawaJapan
  2. 2.Department of Obstetrics and GynecologyNational Defense Medical CollegeTokorozawaJapan
  3. 3.Department of Clinical OncologyNational Defense Medical CollegeTokorozawaJapan

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