Prophylaxis Trial of Posaconazole Versus Standard Azole Therapy for Neutropenic Patients (Study P01899)

Inclusion Criteria: * Adults or adolescents (age\>13 years) and weight\> 34kg, either gender * Disease definition: Anticipated or documented prolonged neutropenia (ANC\<500/mm3 2) Eastern Cooperative Oncology Group (ECOG) performance score of less than 3. * Female subjects of childbearing age must be using a medically accepted method of birth control before beginning study-drug treatment and agree to continue its use during the study or be surgically sterilized (eg, hysterectomy or tubal ligation). * Female subjects of childbearing potential must have a negative serum pregnancy test (beta-hcG) at Baseline or within 72 hours before the start of the study drug. Exclusion Criteria: * Female subjects who are pregnant, intend to become pregnant, or are nursing. * Excluded prior treatments: Subjects previously treated with AMB, FLZ, or ITZ for proven or probable IFI within 30 days of enrollment. * Excluded treatments prior to specific study phases: Subjects who have taken the following drugs: those known to interact with azoles and that may lead to life-threatening side effects. * Subjects who have used any investigational drugs or biologic agents other than their chemotherapy regimens within 30 days of study entry. * Subjects who are participating in any other blinded clinical study within 30 days of study entry. * Subjects with renal insufficiency (estimated creatinine clearance less than 20 mL/minute at Baseline or likely to require dialysis during the study). * Subjects having an ECG with a prolonged QTc interval by manual reading: QTc greater than 450 msec for men and greater than 470 msec for women. * Subjects with moderate or severe liver dysfunction at baseline, defined as aspartate aminotransferase (AST), alanine aminotransferase (ALT), or alkaline phosphatase levels greater than 5 times the upper limit of normal (ULN), or a total bilirubin level greater than 3 times the ULN.