Prognostic significance of Jab1 expression in laryngeal squamous cell carcinomas

Youyi Dong, Li Sui, Yasuo Watanabe, Fuminori Yamaguchi, Naoya Hatano, Masaaki Tokuda

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Purpose: Jun activation domain-binding protein 1 (Jab1) is known as a coactivator of AP1 transcription factor, which contributes to tumor progression by degrading the p27kip1 protein. The purpose of this study is to investigate whether Jab1 expression is correlated with p27kip1 level and cell proliferation, as well as whether Jab1 expression is associated with clinicopathologic variables and prognosis of laryngeal squamous cell carcinoma (LSCC). Experimental Design: Immunohistochemical and/or Western blot analysis was done in HEp-2 cells and 102 cases of LSCCs. Results: Jab1 expression was negatively associated with p27kip1 expression and was positively associated with cell proliferation both in HEp-2 cells and LSCCs. Jab1 over-expression was detected in 51% LSCCs and was significantly associated with unfavorable clinicopathologic variables. Survival analysis revealed that Jab1 overexpression is significantly associated with short disease-free and overall survival (P = 0.0036 and P = 0.0001, respectively). When Jab1 and p27 kip1 are combined, patients with Jab1(+)/ p27kip1(-) revealed poor disease-free and overall survival (P = 0.0008 and P < 0.0001, respectively). When Jab1 expression and lymph node status are combined, patients with Jab1(+)/lymph node(+) revealed poorer disease-free and overall survival than others (P < 0.0001 and P < 0.0001, respectively). Furthermore, patients with the phenotype of Jab1(+)/p27kip1(-)/lymph node(+) revealed the worst disease-free and overall survival (P < 0.0001 and P < 0.0001, respectively). Multivariate analysis revealed that Jab1 protein is an independent prognostic indicator for overall survival. Conclusions: These findings suggested that Jab1 protein may contribute to the tumor progression and represent a novel prognostic indicator for LSCCs.

Original languageEnglish
Pages (from-to)259-266
Number of pages8
JournalClinical Cancer Research
Issue number1
Publication statusPublished - Jan 1 2005
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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