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 Blood, 1 July 2007, Vol. 110, No. 1, pp. 380-383.
Prepublished online as a Blood First Edition Paper on March 14, 2007; DOI 10.1182/blood-2006-12-065599.

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NEOPLASIA

Brief Report

The polycomb group BMI1 gene is a molecular marker for predicting prognosis of chronic myeloid leukemia

Mohamad Mohty1, Agnes S. M. Yong1, Richard M. Szydlo1, Jane F. Apperley1, and Junia V. Melo1

1 Department of Hematology, Imperial College London, Hammersmith Hospital, London, United Kingdom

Because the polycomb group gene BMI1 regulates the proliferation of both normal and leukemic stem cells, we examined whether BMI1 expression was associated with disease progression in chronic myeloid leukemia (CML). Levels of BMI1 RNA were significantly higher in patients with advanced-phase than in patients with chronic-phase CML in both CD34+ cells (P = .006) and total peripheral-blood mononuclear cells (P < .001). E2F1, a transcription factor regulating BMI1, was up-regulated in CML compared with controls (P = .001). In a cohort of 64 CML patients, the level of BMI1 at diagnosis correlated with time to transformation to blast crisis, and the combination of low BMI1 and high proteinase-3 expression was associated in multivariate analysis with an improved overall survival (P = .001). We conclude that BMI1 may be a biomarker for the intrinsic heterogeneity of CML, and its measurement at diagnosis can help predict overall survival and thus contribute to better therapeutic decisions.


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