Overexpression of Eg5 predicts unfavorable prognosis in non-muscle invasive bladder urothelial carcinoma

Int J Urol. 2011 Jun;18(6):432-8. doi: 10.1111/j.1442-2042.2011.02751.x. Epub 2011 Mar 30.


Objective: To investigate the relationship between Eg5 expression and prognosis of patients with non-muscle invasive bladder urothelial carcinoma.

Methods: Eg5 expression was examined by immunohistochemistry in non-muscle invasive urothelial carcinoma specimens (grade: G1, 32 cases; G2, 92 cases; and G3, 39 cases. Stage: pTa, 49 cases and pT1, 114 cases). The correlation between clinicopathological characteristics and Eg5 expression was evaluated. The prognostic significance of Eg5 immunoreactivity was analyzed through survival analysis in 163 non-muscle invasive cases that were treated with transurethral resection and adjuvant intravesical instillations.

Results: The expression of Eg5 was significantly associated with tumor grade (P = 0.006), with a trend towards significant association with stage (P = 0.057). The 163 patients with non-muscle invasive tumors were regularly followed with the mean of 32.52 (from 6 to 72) months. Univariate analysis showed Eg5 overexpression exhibited a significant unfavorable influence on intravesical recurrence (P = 0.012) while having only a marginal correlation with disease progression (P = 0.070). Subsequent Cox hazard multivariate analysis showed that both grade (P = 0.045) and Eg5 expression (P = 0.029) were independent predictors for early intravesical recurrence.

Conclusions: Overexpression of Eg5 correlates with poor differentiation of bladder cancer, and it represents an independent prognostic factor in predicting early intravesical recurrence in non-muscle invasive bladder carcinoma patients.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Biomarkers, Tumor / metabolism*
  • Carcinoma / diagnosis
  • Carcinoma / metabolism*
  • Female
  • Humans
  • Immunohistochemistry
  • Kinesin / metabolism*
  • Male
  • Middle Aged
  • Prognosis
  • Retrospective Studies
  • Urinary Bladder / pathology
  • Urinary Bladder Neoplasms / diagnosis
  • Urinary Bladder Neoplasms / metabolism*
  • Young Adult


  • Biomarkers, Tumor
  • KIF11 protein, human
  • Kinesin