Phase 2 Study of GSK1363089 (Formerly XL880) in Adults With Squamous Cell Cancer of the Head and Neck

Best overall response was assessed by the investigator per response evaluation criteria in solid tumors (RECIST). Per RECIST v1.0 for target lesions and assessed by MRI: Complete Response (CR), Disappearance of all target lesions; Partial Response (PR), >=30% decrease in the sum of the longest diameter of target lesions; Overall Response (OR) = CR + PR. Tumor size was recorded at Baseline, and tumor response were recorded approximately every 8 weeks. Tumor response were classified by the investigator using RECIST criteria participant's best response whether observed in the study treatment period or the treatment extension period was considered. The best overall response was the best response recorded from the start of treatment until disease progression/recurrence. Number of participants who achieved best overall response were recorded.

ORR was defined as the proportion of participants achieving best overall response of confirmed CR or PR divided by the total number of participants who received treatment. Per RECIST v1.0 for target lesions and assessed by MRI: CR, Disappearance of all target lesions; Partial Response PR, >=30% decrease in the sum of the longest diameter of target lesions; OR = CR + PR. Participants were evaluated for tumor response per RECIST. Percentage of participants with ORR were reported.

Data for number of participants who presented one or more adverse events (serious or non serious) was reported. An AE was defined as any untoward medical occurrence (MO) in a participant temporally associated with the use of a medicinal product (MP), whether or not considered related to the MP and can therefore be any unfavourable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with its use. The SAE was any untoward MO that, at any dose, results in death, life threatening, persistent or significant disability/incapacity, results in or prolongs inpatient hospitalization, congenital abnormality or birth defect, that may not be immediately life-threatening or result in death or hospitalization but may jeopardize the participant or may require medical or surgical intervention to prevent one of the other outcomes listed in this definition.

The National Cancer Institute -CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each toxicity based on the following general guideline: Grade 1: Mild AE, Grade 2: Moderate AE, Grade 3: Severe AE, Grade 4: Life-threatening or disabling AE and Grade 5: Death related to AE. Number of participants with abnormalities of CTCAE grade 3 in clinical chemistry parameters: alanine aminotransferase (ALT), γ-glutamyl transferase (GGT), phosphate, low sodium and hematology parameters: Leukocyte and Lymphocytes were presented.

Urinalysis parameters like appearance, color, pH, specific gravity, ketones, protein, glucose, bilirubin, nitrite, urobilinogen, and occult blood were performed. Number of participants with abnormalities are reported. In case of no abnormalities observed then it is reported as zero.

Progression-free survival was defined as the duration from the date of first dose to the date of disease progression or date of death without documented progression or date of study termination + 1. The start of confounding anticancer therapy was not treated as a censoring event. Time to progression or death was censored at the study termination date or at the analysis cutoff date, if earlier.

Overall survival was defined as the duration from the date of the first dose to the date of death. The start of a confounding anticancer therapy was treated as a censoring event. Every effort made to follow participant's until death. Time to death was censored at the date of the latest participant contact or at the analysis cutoff date, if earlier. Kaplan-Meier method was used to estimate the overall survival distribution.

Per RECIST v1.0 for target lesions and assessed by MRI: CR, Disappearance of all target lesions; Partial Response PR, >=30% decrease in the sum of the longest diameter of target lesions; OR = CR + PR. Duration of stable disease was defined as the time between the date of first dose of study drug and the first occurrence of 1 of the events: Tumor progression per RECIST as assessed by the investigator, Termination of study drug because of disease progression, Death due to disease progression, Disease progression as documented on the participant follow-up status form, Initiation of subsequent anticancer therapy.

Disease stabilization rate was defined as the proportion of participants for whom the best overall response was a PR, CR, or stable disease. percentage participants with disease stabilization rate were presented.

Plasma samples for pharmacokinetic analysis were planned to be drawn at time points: Day 1, 5, 19, 33, 43, 47 (approximately 15 minutes before dosing, and at 4 hours (±30 minutes) after dosing) of each treatment cycle, however these analyses were not completed. Cmax was defined as maximal measured plasma concentration over the time span specified. Data was not collected for this endpoint.

tmax was defined as the time to the maximum or "peak" concentration of a drug observed after multiple administration. Blood samples were planned to be obtained during the time points: Day 1, 5, 19, 33, 43, 47 (approximately 15 minutes before dosing, and at 4 hours (±30 minutes) after dosing). However these analyses were not completed. Data was not collected for this endpoint.

AUC was defined as area under the plasma concentration vs. time curve. Blood samples were planned to be collected on time points: Day 1, 5, 19, 33, 43, 47 (approximately 15 minutes before dosing, and at 4 hours (±30 minutes) after dosing). However these analyses were not completed. Data was not collected for this endpoint.

t1/2 was defined as the time to when half of the total amount of a particular substance is eliminated from the body. Blood samples were planned to be obtained during indicated time points: Day 1, 5, 19, 33, 43, 47 (approximately 15 minutes before dosing, and at 4 hours (±30 minutes) after dosing). However these analyses were not completed. Data was not collected for this endpoint.

Blood samples were planned to be obtained during indicated time points: Day 1, 5, 19, 33, 43, 47 (approximately 15 minutes before dosing, and at 4 hours (±30 minutes) after dosing). Data for apparent oral clearance was not derived as pharmacokinetic analysis was not completed. Data was not collected for this endpoint.

Blood samples were planned to be obtained during indicated time points: Day 1, 5, 19, 33, 43, 47 (approximately 15 minutes before dosing, and at 4 hours (±30 minutes) after dosing). Data for apparent volume of distribution was not derived as pharmacokinetic analysis was not completed. Data was not collected for PK analysis.