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A Population-based Assessment of the Prognostic Value of the CD19 Positive Lymphocyte Count in B-cell Chronic Lymphocytic Leukemia using Cox and Markov Models

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Abstract

No population-based study has assessed the prognostic impact on survival of the CD19 positive lymphocyte count, evaluated by immunophenotyping at diagnosis, in B-cell chronic lymphocytic leukemia (B-CLL). Aiming at addressing this issue, we investigated the clinical outcome of a well-defined population of B-CLL patients. Survival of B-CLL patients, diagnosed between 1990 and 1999 and recorded by the Registry of Hematological Malignancies of the Côte d’Or, was analysed applying Cox’s regression model to the 237 included cases and to the 195 Binet stage A patients. To assess simultaneously the predictive value of each parameter on the risk of disease progression and on the risk of death, we completed this analysis by applying a three-states homogeneous Markov model to the whole study population. Analysis of the entire population showed that age (p<0.001), Binet stage (p=0.008) and CD19 positive lymphocyte count (p=0.038) were three independent prognostic factors. However, in stage A patients, only progression into a more advanced stage, analysed as a time-dependent variable, and age had a clear impact on survival (p<0.001 for both). Markov model revealed that an increased CD19 positive lymphocyte count increased the risk of disease progression in stage A patients (p=0.002) but did not have direct impact on survival of either stage A patients with stable disease or stage B or C patients. An increased CD19 positive lymphocyte count at diagnosis is a marker of an increased risk of disease progression in stage A patients. Thus, it can be a useful tool for the clinical management of these patients.

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Authors and Affiliations

  1. Service de Biostatistique et Informatique Médicale, Centre Hospitalier Universitaire, Dijon, France

    R. Cailliod, C. Quantin, G. Le Teuff & Binquet C.

  2. Faculté de Médecine, Registre des Hémopathies Malignes de Côte d’Or, équipe associée INSERM/InVS 4T003C, Dijon, France

    R. Cailliod, P. M. Carli, V. Jooste & M. Maynadie

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Cailliod, R., Quantin, C., Carli, P.M. et al. A Population-based Assessment of the Prognostic Value of the CD19 Positive Lymphocyte Count in B-cell Chronic Lymphocytic Leukemia using Cox and Markov Models. Eur J Epidemiol 20, 993–1001 (2005). https://doi.org/10.1007/s10654-005-3777-6

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