A Study of the Safety and Effectiveness of Apixaban in Preventing Blood Clots in Children With Leukemia Who Have a Central Venous Catheter and Are Treated With Asparaginase

Inclusion Criteria

• New diagnosis of de novo ALL, lymphomas (T or B cell), or mixed-phenotype acute leukemia
• Planned 3-4 drug systemic induction chemotherapy with a corticosteroid, vincristine and a single dose or multiple doses of asparaginase, with or without daunorubicin
• Functioning Central Venous Access Device
• Must be able to tolerate oral medication or have it administered via an Nasogastric tube (NGT) or GT tube
• Males and females,age 1 year(365 days) to < 18 (17 years and 364 days) years.

Exclusion Criteria

• Subjects scheduled to have > 3 Lumbar Punctures over the course of the study treatment period
• Prior history of documented DVT or PE in the past 3 months
• Known inherited bleeding disorder or coagulopathy
• Major surgery [excluding Central Venous Access Device (CVAD) replacement and bone marrow aspiration and non-open biopsy] within the last 7 days prior to enrollment that may be associated with a risk of bleeding. Open biopsy is considered a major surgery.
• Uncontrolled severe hypertension at enrollment. Severe hypertension is defined as a systolic or diastolic blood pressure (BP) > 5 mm Hg above the 95th percentile as defined by the National High Blood Pressure Education Program Working Group (NHBPEP) established guidelines for the definition of normal and elevated blood pressure in children
• Extreme hyperleukocytosis, white blood cell (WBC) counts over 200 x 109/L (200,000/microL) at the time of enrollment
• Liver dysfunction manifested by SGTP (ALT) > 5X Upper limit of normal (ULN) and/or Aspartate aminotransferase (AST) >5 X ULN and/or direct (conjugated) bilirubin > 2X ULN
• Renal function < 30% of normal for age and size as determined by the Schwartz formula
• International normalized ratio (INR) > 1.4 and activated partial thromboplastin time (aPTT) > 3 seconds above the upper limit of normal for age, within 1 week prior to enrollment.
• History of allergy to apixaban or Factor Xa inhibitors
• History of significant adverse reaction or major bleeding related adverse reaction to other anticoagulant or antiplatelet agents
• History of any significant drug allergy (such as anaphylaxis or hepatotoxicity
• Any investigational drug being administered during the study Other protocol inclusion/exclusion criteria may apply