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Research ArticleExperimental Studies

Pathological Significance of Kidney and Brain Expressed Protein (KIBRA) in Clear Cell Renal Cell Carcinoma

YOSHIAKI NAGASHIMA, KENSUKE MITSUNARI, TOMOHIRO MATSUO, YUICHIRO NAKAMURA, YASUYOSHI MIYATA and KOJIRO OHBA
Anticancer Research January 2023, 43 (1) 45-51; DOI: https://doi.org/10.21873/anticanres.16132
YOSHIAKI NAGASHIMA
Department of Urology and Renal Transplantation, Nagasaki University Hospital, Nagasaki, Japan
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KENSUKE MITSUNARI
Department of Urology and Renal Transplantation, Nagasaki University Hospital, Nagasaki, Japan
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TOMOHIRO MATSUO
Department of Urology and Renal Transplantation, Nagasaki University Hospital, Nagasaki, Japan
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YUICHIRO NAKAMURA
Department of Urology and Renal Transplantation, Nagasaki University Hospital, Nagasaki, Japan
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YASUYOSHI MIYATA
Department of Urology and Renal Transplantation, Nagasaki University Hospital, Nagasaki, Japan
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KOJIRO OHBA
Department of Urology and Renal Transplantation, Nagasaki University Hospital, Nagasaki, Japan
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  • For correspondence: ohba-k@nagasaki-u.ac.jp
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Abstract

Background/Aim: Kidney and brain expressed protein (KIBRA), a member of the WW domain-containing protein family, has an important role in tumour growth and progression in various cancers. However, the pathological significance of KIBRA expression in clear cell renal cell carcinoma (ccRCC) tissues is not fully understood. The aim of this study was to clarify the pathological significance and prognostic roles of KIBRA expression in patients with ccRCC. Materials and Methods: KIBRA immunoreactivity, proliferation index (PI; with anti-Ki-67 antibody), apoptotic index (AI; using anti-cleaved caspase-3), and large tumour suppressor kinases (LATS-2) were evaluated in 157 ccRCC specimens by immunohistochemistry. Fifty normal kidney tissues were also evaluated as controls. The relationships between KIBRA expression and these cancer-related variables as well as clinicopathological features and survival were analysed. Results: Moderate to strong immunoreactivity of KIBRA was identified in all normal kidney tissues; however, ccRCC cells with strong KIBRA expression was rare. The immunoreactivity score (IRS) of KIBRA was negatively associated with grade, T stage, tumour diameter, and metastasis. Kaplan–Meier survival curves showed that high KIBRA expression was a favourite predictor for overall survival. KIBRA IRS was negatively associated with PI and positively associated with the IRS of LATS-2 by univariate analysis. In addition, multivariate analysis showed that KIBRA was significantly associated with PI. Conclusion: KIBRA demonstrated important roles as a tumour suppressor in ccRCC. In addition, its expression was significantly associated with survival in these patients. Several such KIBRA-related functions were speculated to be modulated by cancer cell proliferation and LATS-2.

Key Words:
  • Clear cell renal cell carcinoma
  • KIBRA
  • cell proliferation
  • apoptosis
  • LATS-2
  • Received November 17, 2022.
  • Revision received November 30, 2022.
  • Accepted December 1, 2022.
  • Copyright © 2023 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.
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Anticancer Research: 43 (1)
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January 2023
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Pathological Significance of Kidney and Brain Expressed Protein (KIBRA) in Clear Cell Renal Cell Carcinoma
YOSHIAKI NAGASHIMA, KENSUKE MITSUNARI, TOMOHIRO MATSUO, YUICHIRO NAKAMURA, YASUYOSHI MIYATA, KOJIRO OHBA
Anticancer Research Jan 2023, 43 (1) 45-51; DOI: 10.21873/anticanres.16132

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Pathological Significance of Kidney and Brain Expressed Protein (KIBRA) in Clear Cell Renal Cell Carcinoma
YOSHIAKI NAGASHIMA, KENSUKE MITSUNARI, TOMOHIRO MATSUO, YUICHIRO NAKAMURA, YASUYOSHI MIYATA, KOJIRO OHBA
Anticancer Research Jan 2023, 43 (1) 45-51; DOI: 10.21873/anticanres.16132
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Keywords

  • Clear cell renal cell carcinoma
  • KIBRA
  • cell proliferation
  • apoptosis
  • LATS-2
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