A Pharmacokinetic (PK) Study of Nilotinib in Pediatric Patients With Philadelphia Chromosome-positive (Ph+) Chronic Myelogenous Leukemia (CML) or Acute Lymphoblastic Leukemia (ALL)

Number of Ph+ CML Participants With Confirmed Complete Hematologic Response (CHR)

A confirmed complete hematological response (CHR) is defined when all of the following criteria are achieved at two consecutive assessments, at least 4 weeks apart: white blood cell (WBC) count \< 10 × 109/L; platelet \< 450 × 109/L; basophils \< 5%; no blasts and promyelocytes in peripheral blood (PB); myelocytes + metamyelocytes \< 5% in PB; and no extramedullary involvement. The information used for hematological assessment was to be obtained from the laboratory and extramedullary data, all merged by patient and date.

Time frame: minimum of 12 cycles (28 days per cycle)

Number of Ph+ CML Participants With Cytogenic Response

Cytogenetic response was initially assessed as the percentage of Ph+ metaphases in the bone marrow (BM) and performed within 21 days prior to study entry. A major cytogenetic response (0% to 35% Ph+ metaphases test positive for the Philadelphia chromosome) combines both complete cytogenetic (CCyR) and partial cytogenetic response (PCyR). CCyR implies 0% Ph+ metaphases in the BM, PCyR is \> 0% to 35%, minor cytogenetic response (mCyR) is \> 35% to 65%, minimal response is \> 65% to 95% and no response is \> 95% Ph+ metaphases in the BM.

Time frame: minimum of 12 cycles (28 days per cycle)

Number of Ph+ CML Participants With Major Molecular Response (MMR)

The bcr-abl gene fusion encodes for a BCR-ABL fusion protein. Depending on the precise location of the fusion, the molecular weight of this protein can range from 185 to 210 kDa. Consequently BCR-ABL is referred to as p185 or p210 transcript. For the patients expressing the major BCR-ABL transcript p210, molecular response was defined and reported as the percent ratio of BCR-ABL transcripts/control gene transcripts converted to a reference standard according to the International Scale (IS). A major molecular response (MMR) is defined as a BCR-ABL/control gene ratio ≤ 0.1% (equal to a 3 log reduction in BCR-ABL transcripts) on the IS. In this study, the control gene was abl.

Time frame: minimum of 12 cycles (28 days per cycle)

Efficacy Endpoints for Ph+ ALL Patients

Best Response in Ph+ ALL patients was defined as either Complete Remission (CR) with platelet recovery, Complete Remission (CR) with incomplete platelet recovery, Partial Remission (PR) or Stable disease. Stable disease was defined is defined as failure to qualify for either CR, PR, or progressive disease.

Time frame: minimum of 12 cycles (28 days per cycle)