Open-label Study to Evaluate the Safety, PK, and PD of MEK Inhibitor GSK1120212 in Subjects With Relapsed or Refractory Leukemias

An AE is any untoward medical occurrence in a participant (par.) or clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. An SAE is defined as any untoward medical occurrence that, at any dose, results in death, is life threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, or is an event of possible drug-induced liver injury. Refer to the general Adverse AE/SAE module for a complete list of AEs and SAEs.

Hematology and clinical chemistry data were summarized according to National Cancer Institutes (NCI) Common Terminology Criteria for Adverse Events (CTCAE) grade, version 3.0. Grade 1, Mild; Grade 2, Moderate; Grade 3, Severe; Grade 4, Life-threatening or disabling; Grade 5, Death. Data are presented for only those parameters for which an increase to Grade 3 or Grade 4 occurred. Hematology tests where the toxicity grade is defined by NCI-CTCAE includes hemoglobin, international normalized ratio (INR), lymphocytes, total neutrophils, platelet count, and partial thromboplastin time (PTT). Participants with missing baseline grades were assumed to have a baseline grade of 0. Only those participants (par.) with laboratory values for worst-case on-therapy (defined as the worst shift that occurred at any time during the treatment period) are presented.

Hematology and clinical chemistry data were summarized according to NCI-CTCAE grade, version 3.0. Grade 1, Mild; Grade 2, Moderate; Grade 3, Severe; Grade 4, Life-threatening or disabling; Grade 5, Death. Data are presented for only those parameters for which an increase to Grade 3 or Grade 4 occurred. Clinical chemistry tests where the toxicity grade is defined by NCI-CTCAE includes albumin, alkaline phosphatase, alanine aminotransferase, aspartate aminotransferase (AST), total bilirubin, calcium, creatinine, glucose, bicarbonate, potassium, magnesium, sodium, and phosphorus. Participants with missing Baseline grades were assumed to have a Baseline grade of 0. Only those participants (par.) with laboratory values for worst-case on-therapy are presented.

Change from Baseline in heart rate is categorized as decrease to <60 beats per minute (bpm), change to normal or no change, and increase to >100 bpm. Participants with a missing Baseline value are assumed to have a normal Baseline value. Participants are counted twice if the participant heart rate value decreased to <60 bpm and increased to >100 bpm post-baseline. Only those participants (par.) with heart rate values for worst-case on-therapy are presented.

Change from Baseline in systolic blood pressure (SBP) is categorized as: Grade 0 (<120 millimeters of mercury [mmHg]), Grade 1 (120-139 mmHg), Grade 2 (140-159 mmHg), and Grade 3/4 (>=160 mmHg). Change from Baseline in diastolic blood pressure (DBP) is categorized as: Grade 0 (<80 mmHg), Grade 1 (80-89 mmHg), Grade 2 (90-99 mmHg), and Grade 3/4 (>=100 mmHg). An increase is defined as an increase in the CTCAE grade relative to the Baseline grade. Participants with missing Baseline values are assumed to have a Baseline value of grade 0. Only those participants (par.) with blood pressure values for worst-case on-therapy are presented.

Change from Baseline in temperature is categorized as a decrease to <=35 degrees celsius (C), change to normal or no change, and increase to >=38 degrees C. Participants with a missing Baseline value are assumed to have a normal Baseline value. Participants (par.) are counted twice if the participant temperature value decreased to <=35 degrees C and increased to >=38 degrees C post-Baseline. Only those participants with temperature values for worst-case on-therapy are presented.

Overall response rate (ORR=CR+CRp+Marrow CR+MLFS+PR) was calculated from the investigator's assessment of response recorded within the first eight weeks of treatment. CR includes complete remission. Complete remission is a state in which the participant must be free of all symptoms related to leukemia and have an absolute neutrophil count >=1 x 10^9/L, platelet count >=100 x 10^9/L, and normal marrow differential (<=5% blasts). PR includes partial remission. Partial remission is a state in which the participant has a CR with 6 to 25% abnormal cells in the marrow or 50% decrease in bone marrow blasts. CRp is as per CR but platelet count <100 x 10^9/L. MLFS is a state in which the participant has a normal marrow differential (<5% blasts), neutrophil, and platelet counts are not considered.

Area under the concentration-time (AUC) curve from time zero (pre-dose) to 24 hours (AUC[0-24]) for Cycle 1 Day 1 (C1D1), from time zero to the last time of a quantifiable concentration (AUC[0-t]) for C1D1 and Cylce 1 Day 15 (C1D15) and AUC curve over the dosing interval AUC[0-tau] for C1D15 were measured. Blood samples for PK analysis were taken on Day 1 and Day 15 (within 30 minutes [min] before study drug administration) and at 0.5 hour (h), 1 h, 1.5 h, 2 h, 3 h, 4 h, 6 h, 8 h, and 24 h post-dose. All other PK sampling were done pre-dose (i.e., within 30 min before study drug administration).

Cmax is defined as the maximum observed concentration of GSK1120212 and was measured for C1D1 and C1D15. Cmin is defined as the minimal observed concentration of GSK1120212 and was measured for C1D15. Blood samples for PK analysis were taken on Day 1 and Day 15 (within 30 min before study drug administration) and at 0.5 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 6 h, 8 h, and 24 h post-dose. All other PK sampling were done pre-dose (i.e., within 30 min before study drug administration).

t1/2 is defined as terminal phase half-life, which is the time required for the amount of the drug in the body to decrease by half and was measured for C1D1. t1/2eff. is defined as the effective half-life and was measured for C1D15. Blood samples for PK analysis were taken on Day 1 and Day 15 (within 30 min before study drug administration) and at 0.5 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 6 h, 8 h, and 24 h post-dose. All other PK sampling were done pre-dose (i.e., within 30 min before study drug administration).

Tmax is defined as the time to reach the observed maximum concentration and was measured for C1D1 and C1D15. Blood samples for PK analysis were taken on Day 1 and Day 15 (within 30 min before study drug administration) and at 0.5 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 6 h, 8 h, and 24 h post-dose. All other PK sampling were done pre-dose (i.e., within 30 min before study drug administration).

AR is the ratio of the Day 15 AUC0-tau (0 hour to last dose interval) and Day 1 AUC0-tau (AUCtau C1D15/AUCtau C1D1). Blood samples for PK analysis were taken on Day 1 and Day 15 (within 30 min before study drug administration) and at 0.5 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 6 h, 8 h, and 24 h post-dose. All other PK sampling were done pre-dose (i.e., within 30 min before study drug administration).

Ctau is the pre-dose (trough) concentration at the end of the dosing interval and was measured for Cycle 1 Day 15 (C1D15), Cycle 2 Day 1(C2D1), Cylce 3 Day 1 (C3D1), Cycle 4 Day 1 (C4D1), Cycle 5 Day 1 (C5D1), Cycle 6 Day 1 (C6D1), Cycle 7 Day 1 (C7D1), Cycle 8 Day 1 (C8D1), Cycle 9 Day 1 (C9D1), Cycle 10 Day 1 (C10D1), Cycle 11 Day 1 (C11D1) and Cycle 12 Day 1 (C12D1). Blood samples for PK analysis were collected pre-dose (i.e., no later than 15 min prior to dosing).

Overall survival is defined as the time from the start of study treatment (GSK1120212) until death due to any cause. For the analysis of overall survival, the last date of known contact was used for those participants who had not died at the time of analysis; such participants were considered censored.