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Blood, 1 February 2008, Vol. 111, No. 3, pp. 1603-1609.
Prepublished online as a Blood First Edition Paper on November 15, 2007; DOI 10.1182/blood-2007-06-097774.
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Submitted June 26, 2007
Accepted October 30, 2007
The centrosome index is a powerful prognostic marker in myeloma and identifies a cohort of patients that may benefit from aurora kinase inhibition
Wee J Chng*, Esteben Braggio, George Mulligan, Barbara Bryant, Ellen Remstein, Riccardo Valdez, Ahment Dogan, and Rafael Fonseca
Department of Hematology-Oncology, Mayo Clinic, Scottsdale, AZ, United States
Oncology Clinical Development, Millennium Pharmaceuticals, Inc., Cambridge, MA, United States
Department of Pathology, Mayo Clinic, Rochester, MN, United States
Department of Pathology, Mayo Clinic, Scottsdale, AZ, United States
* Corresponding author; email: wee_joo_chng{at}nuh.com.sg.
Centrosome amplification is common in myeloma and may be involved in disease pathogenesis. We have previously derived a gene expression-based centrosome index (CI) that correlated with centrosome amplification and was an independent prognostic factor in a small cohort of heterogeneously treated patients. In this study, we validated the prognostic significance of the CI in 2 large cohorts of patients entered into clinical trials and showed that a high CI is a powerful independent prognostic factor in both newly diagnosed and relapsed patients whether treated by intensive therapy (total therapy II) or novel agents (bortezomib). Tumors with high CI over-expressed genes coding for proteins involved in cell cycle, proliferation, DNA damage and G2-M checkpoints, and associated with the centrosome and kinetochore / microtubules. In particular, aurora kinases are significantly over-expressed in patients with high CI, with concordant increase in protein expression. Human myeloma cell lines with higher CI are more responsive to treatment with a novel aurora kinase inhibitor. Aurora kinase may represent novel therapeutic targets in these patients with very poor prognosis.

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