PFS was defined as the time interval between the date of randomization and the earliest date of either disease progression or death due to any cause. The diagnosis of progression was based on tumor measurements, according to Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.0 criteria, by independent radiologic assessment. The Kaplan-Meier method was used for PFS estimates.

Intent-to-Treat (ITT) Population: all randomized participants analyzed in the treatment arm they were allocated by randomization.

OS was defined as the time from the date of randomization to the date of death due to any cause. The length of this interval was calculated as the date of death minus the date of randomization plus 1 day. Participants who were alive at the time of analysis were censored at the date of last follow-up. The interim OS analysis was conducted when 215 (77 percent [%]) of the 279 required death events had occurred in the study. The Kaplan-Meier method was used for OS estimates.

ITT Population

Overall response is defined as the number of participants who had a complete response (CR) or a partial response (PR). According to RECIST, Version 1.0: CR, disappearance of all lesions; PR, a >=30% decrease in the sum of the longest dimensions (LD) of the target lesions (TLs) taking as a reference the baseline sum LD; Progressive disease (PD), a >=20% increase in the sum of the LD of TLs, or the appearance of >=1 new lesion; Stable Disease (SD), neither PR nor PD, persistence of >=1 non-TL. Participants with no follow-up radiological disease assessment were categorized as not evaluable (NE).

ITT Population

Time to response was defined as the time from the date of randomization until the date of first documented evidence of CR or PR (whichever status was recorded first). The Kaplan-Meier method was used for time to response estimates.

ITT Population. Only participants who achieved a confirmed CR or PR, as determined independently by the Independent Radiologist and the Investigator, were analyzed. Only results for the pazopanib arm are given because there was no response in the placebo arm.

Duration of response was defined as the time from the date of the first documented evidence of CR or PR until the date of either the first documented sign of PD or death due to any cause. Participants who neither died nor progressed were censored at the date of the last adequate radiologic assessment. The Kaplan-Meier method was used for duration of response estimates.

ITT Population. Only participants who achieved a confirmed CR or PR, as determined independently by the Independent Radiologist and the Investigator, were analyzed. Only results for the pazopanib arm are given because there was no response in the placebo arm.

PFS was defined as the time interval between the date of randomization and the earliest date of either disease progression or death due to any cause. Participants were analyzed for PFS in histology subgroups of STS (as per the World Health Organization [WHO] classification, 2008): leiomyosarcoma (malignant cancer of smooth muscle), synovial sarcoma (cancer near the joints of the arm or leg), and other STS (without the tumor type of leiomyosarcoma or synovial sarcoma), based on independent review.The Kaplan-Meier method was used for PFS estimates.

ITT Population. The "n"s in the category titles represent the number of participants in each treatment arm with the indicated STS.

Change from baseline in on-therapy SBP and DBP was calculated as the values at the indicated time points (Day 8 and Weeks 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 88, 96, and 104) minus the value at baseline.

Safety Population: all participants who had started their allocated treatment (at least one dose of the study drug). Data were analyzed for participants who were on-therapy and provided data at the indicated time point.

Change from baseline in on-therapy heart rate was calculated as the value at the indicated time points (Day 8 and Weeks 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 88, 96, and 104) minus the value at baseline.

Safety Population. Data were analyzed for participants who were on-therapy and provided data at the indicated time point.

Shifts in hematology values by grade were summarized based on the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE Version 3.0). Grade refers to the severity of the AE. The CTCAE Version 3.0 displays Grades 1 through 5 with unique clinical descriptions of severity for each AE based on this general guideline. Participants with a missing baseline grade were assumed to have a baseline Grade of 0. Any increase in grade from baseline and shifts to Grade 3 (severe AE) and 4 (life-threatening or disabling AE) at any point in the study after baseline are reported.

Safety Population. Data were analyzed for participants who were on-therapy and provided data at the indicated time point.

Shifts in clinical chemistry values by grade were summarized based on the NCI CTCAE Version 3.0. Participants with a missing baseline grade were assumed to have a baseline Grade of 0. Any increase in grade from baseline and shifts to Grade 3 and 4 at any point in the study after baseline are reported. alkaline phosphatase, ALKP; alanine aminotransferase, ALT; aspartate aminotransferase, AST. Hyper/hypoglycemia refers to high/low glucose; hyper/hypokalemia refers to high/low potassium; hyper/hyponatremia refers to high/low sodium.

Safety Population. Data were analyzed for participants who were on-therapy and provided data at the indicated time point.

LVEF is the measurement of how much blood is being pumped out of the left ventricle of the heart (the main pumping chamber) with each contraction and is used to determine cardiac function (based on the institutional lower limit of normal [LLN]). LVEF was assessed at BL, Week 12, and every second scheduled visit thereafter until study drug discontinuation and end of treatment or as clinically indicated by using multi-gated acquisition scan (MUGA) or echocardiogram (ECHO). Absolute change from BL was calculated as the on-study value minus the baseline value (LVEF is calculated as a percentage).

Safety Population. Data were analyzed for participants who were on-therapy and provided data at the indicated time point.