Dasatinib Combined With Chemotherapy in Philadelphia Chromosome-positive Acute Lymphoblastic Leukemia

Inclusion Criteria:

1. Patients aged 18 to 60 years with De novo Philadelphia chromosome positive (Philadelphia chromosome positive or BCR/ABL transcript positive) acute lymphoblastic leukemia.
2. Eastern Cooperative Oncology Group (ECOG) Performance status 2.
3. Adequate end organ function as defined by: Total bilirubin ≤ 1.5 x upper limit of normal（ULN）; serum glutamic-oxaloacetic transaminase(SGOT) and serum glutamic pyruvic transaminase(SGPT) ≤ 2.5 x ULN; Creatinine ≤ 1.5 x ULN; Serum amylase and lipase ≤ 1.5 x ULN; Alkaline phosphatase ≤ 2.5 x ULN unless considered tumor related; Patients must have adequate cardiac function (ejection fraction ≥ 45 % on Multiple Gated Acquisition (MUGA) scan).
4. Patients must have the following laboratory values (≥ lower limit of normal (LLN) or corrected to within normal limits with supplements prior to the first dose of study medication.): Potassium ≥ LLN; Magnesium ≥ LLN; Phosphorus ≥ LLN
5. Patients should sign informed consent form.

Exclusion Criteria:

1. Impaired cardiac function:

   Long QT syndrome or a known family history of long QT syndrome; clinically significant resting brachycardia (\<50 beats per minute); ejection fraction \< 45 % on MUGA scan. QTc interval \> 450 msec on baseline ECG (using the QTcF formula). If QTcF interval\>450 msec and electrolytes are not within normal ranges, electrolytes should be corrected and then the patient re-screened for QTc. Myocardial infarction within 12 months prior to starting study; other clinically significant heart disease (e.g. unstable angina, congestive heart failure or uncontrolled hypertension, uncontrolled arrhythmias).

   Patients who are currently receiving treatment with any medications that have the potential to prolong the QT interval and the treatment cannot be either discontinued or switched to a different medication prior to starting study drug.
2. Other concurrent severe and/or uncontrolled medical conditions:

   Patients with another primary malignant disease, except those that do not currently require treatment; acute or chronic liver, pancreatic or severe renal disease; another severe and/or life-threatening medical disease.
3. Patients who are: (a) pregnant, (b) breast feeding, (c) of childbearing potential without a negative pregnancy test prior to baseline and (d) male or female of childbearing potential unwilling to use contraceptive precautions throughout the trial (post-menopausal women must be amenorrheic for at least 12 months to be considered of non-childbearing potential).
4. Who is known human deficiency virus (HIV) positive.
5. Use of any other investigational agent in the last 30 days.