Study of Pazopanib in the Treatment of Surgically Unresectable or Metastatic Liposarcoma

Inclusion Criteria:

* Written informed consent.
* Age \> or = to 18 years.
* Histologically or cytologically confirmed high- or intermediate-grade liposarcoma (allowed subtypes include liposarcoma dedifferentiated, myxoid/round cell, pleomorphic, mixed-type, or not otherwise specified).
* Surgically unresectable or metastatic disease.
* Any number of prior treatment treatment regimens, including treatment naive subjects.
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
* Measurable or evaluable (non-measurable) disease per RECIST guidelines version 1.1. Subjects must have documented disease progression within the past 6 months.
* Adequate organ system function determined within 14 days prior to first dose of study treatment.
* Left ventricular ejection fraction (LVEF) \> 50% of the institutional LLN within 28 days prior to the first dose of study treatment.
* Females must be of either non-child bearing potential or have a negative pregnancy test within 7 days prior to the first dose of study treatment.

Exclusion Criteria:

* Well differentiated liposarcoma.
* Prior treatment with tyrosine kinase inhibitors (TKIs) or vascular endothelial growth factor (VEGF) inhibitors.
* Prior malignancy (Note: subjects who have had another malignancy and have been disease-free for 3 years, or subjects with a history of completely resected non-melanomatous skin carcinoma or successfully treated in situ carcinoma are eligible).
* History or clinical evidence of central nervous system metastases or leptomeningeal carcinomatosis, unless previously treated, asymptomatic, and off steroids and anti-seizure medication for 6 months prior to first dose of study drug
* Clinically significant gastrointestinal (GI) abnormalities that may increase the risk for GI bleeding.
* Clinically significant GI abnormalities that may affect absorption of investigational product.
* Presence of uncontrolled infection.
* Corrected QT interval \> 480 msecs using Bazett's formula.
* History of certain cardiovascular conditions within the past 6 months.
* Poorly controlled hypertension \[defined as systolic blood pressure of \> or = 140 mmHg or diastolic blood pressure \> or = 90 mmHg\].
* History of cerebrovascular accident including transient ischemic attack, pulmonary embolism, or untreated deep vein thrombosis within the past 6 months.
* Prior major surgery or trauma within 28 days prior to the first dose of study drug and/or presence of any non-healing wound, fracture, or ulcer.
* Evidence of active bleeding or bleeding diathesis.
* Known endobronchial lesions and/or lesions infiltrating major pulmonary vessels that increase the risk of pulmonary hemorrhage.
* Hemoptysis in excess of 2.5 mL within 8 weeks of first dose of study drug.
* Any serious and/or unstable pre-existing medical, psychiatric, or other condition that could interfere with subject's safety, provision of informed consent, or compliance to study procedures.
* Unable or unwilling to discontinue use of prohibited medications for at least 14 days or five half-lives of a drug, whichever is longer, prior to the first dose of study drug and for the duration of study treatment.
* Radiation therapy, minor surgery, tumor embolization, chemotherapy, immunotherapy, biologic therapy, investigational therapy, or hormonal therapy within 14 days or five half-lives of a drug (whichever is longer) prior to the first dose of study drug.
* Administration of any non-oncologic investigational drug within 30 days or five half-lives (whichever is longer) prior to receiving the first dose of study drug.
* Any ongoing toxicity from prior anti-cancer therapy that is \> Grade 1 and/or that is progressing in severity, except alopecia.
* Known immediate or delayed hypersensitivity reaction to idiosyncrasy to drugs chemically realted to pazopanib or excipients that contraindicates participation.