Phase III Trial Evaluating the Effectiveness of a Dose Adjustment of Imatinib Mesylate on the Molecular Response

Inclusion Criteria:

1. Patients with CML-CP treated for at least two years by Imatinib Mesylate 400 mg / d,
2. Patients in complete cytogenetic response for at least 1 year
3. Patients with residual disease detectable by quantitative RT-PCR (RQ-PCR)
4. ECOG ≤ 2,
5. Age ≥ 18 years
6. Signed informed consent,
7. Membership of a social security system

Exclusion Criteria:

1. Patients with CML-CP Philadelphia chromosome negative diagnosis.
2. Patients previously treated with Imatinib Mesylate at doses above 400 mg / day
3. Patient with non-hematologic toxicity of grade III or IV in Imatinib Mesylate 400mg / d
4. Patient with a medical condition endocrine, psychiatric, neurological, renal, hepatic or cardiac progressive uncontrolled by medical treatment
5. Pregnant or breastfeeding women, women of childbearing potential not using a contraceptive method effective
6. Known HIV positive
7. Patients previously treated with another tyrosine kinase inhibitor
8. Patient participating in another interventional clinical trial
9. History of non-compliance to Imatinib Mesylate