| 
      1Continuous variable are summarized as median supplied with min -max range (in parentheses).
        | Parameter | Group A: patients with Imatinib therapy for 15 months (N=28) | Group B: patients with Imatinib therapy for 50 months (N=28) |  
        | Male sex | N=15 (53.6 %) | N=13 (46.4 %) |  
        | Age (yrs)1 | 60 (33-80) | 61 (33-74) |  
        | Age ≥60 yrs | N=16 (57.1 %) | N=16 (57.1 %) |  
        | BMI (kg.m-2) | 27.2 (16.8-38.1) | 27.4 (16.0-40.0) |  
        | Other    malignancies | N=1 (3.6 %) | N=2 (7.1 %) |  
        | Other cancer therapy | N=1 (3.6 %) | N=0 (0.0 %) |  
        | Cardiac problems | N=11 (39.3 %) | N=7 (25.0 %) |  
        | Stroke | N=0 (0.0 %) | N=1 (3.6 %) |  
        | Rheumatic disease | N=5 (17.9 %) | N=5 (17.9 %) |  
        | Gastrointestinal disorders | N=7 (25.0 %) | N=8 (28.6 %) |  
        | Invalidity | N=12 (42.9 %) | N=8 (28.6 %) |  
        | Rheumatic disease and/or    invalidity | N=17 (60.7 %) | N=16 (57.1 %) |  
        | Prior CML treatment | N=10 (35.7%) | N=19 (67.9%) |  
        | -  Interferon-α 
 | N=6 | N=19 |  
        | -  Hydroxyurea 
 | N=10 | N=17 |  
        | -  Other treatment 
 | N=5 | N=11 |  
        | Imatinib    treatment (mg/day) 
          
            -  Starting dose,    mg/day 
 | 400 (200-400) | 400 (300-400) |  
        | -  Baseline dose    (mg/day) 
 | 400 (250-800) | 400 (100-800) |  
        | Disease phase |  |  |  
        | -  Chronic 
 | N=27 (96.4%) | N=27 (96.4%) |  
        | -  Not applicable 
 | N=1 (3.6%) | N=1 (3.6%) |  
        | Sokal risk group |  |  |  
        | -  Low 
 | N=7 (25.0%) | N=9 (32.1%) |  
        | -  Intermediate 
 | N=10 (35.7%) | N=9 (32.1%) |  
        | -  High 
 | N=6 (21.4%) | N=3 (10.7%) |  
        | -  Not applicable 
 | N=5 (17.9%) | N=7 (25.0%) |  
        | Imatinib therapy status |  |  |  
        | -  success 
 | N=21 (75.0%) | N=25 (89.3%) |  
        | -  failure* 
 | N=7 (25.0%) | N=3 (10.7%) |  
        | *Reason of failure |  |  |  
        | -  Intolerance 
 | N=1 | N=1 |  
        | -  Resistance 
 | N=4 | N=1 |  
        | -  Mutation 
 | N=3 | N=0 |  
        | -  Progression 
 | N=2 | N=1 |  Binary variables are expresses as N (%) of a respective item.
 *Imatinib failure was defined as a progression to advanced phase of the disease, loss of hematologic or cytogenetic response, lack of hematologic or cytogenetic response
      achievement at the defined time points, presence of Imatinib-resistant Bcr-Abl mutation, discontinuation of Imatinib treatment because of intolerance or death from any
    cause, whichever came first [11].
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