A Trial of ABSK043, an Oral PD-L1 Inhibitor, in Patients With Angiogenic Sarcomas

ABSK043 is a new type of experimental drug that blocks a protein called programmed cell death ligand 1 (PD-L1), which is important in controlling the body's response to harmful substances including cancer cells. By blocking PD-L1 from working, ABSK043 may allow the body's immune system to recognize and kill cancer cells. ABSK043 is considered "experimental" because it has not been approved for sale by Health Canada. Health Canada has approved the study drug to be administered in this research study. The main purposes of this study are: * To see if patients with your type of cancer benefit from ABSK043. * To evaluate the safety and tolerability of ABSK043. * To identify biomarkers (Biological flags used to measure disease progress or drug effect.) in tumor tissues or blood that might help identify patients whose cancers respond to ABSK043, and which patients may develop side effects from these study drugs. Examples of biomarkers include the type of white blood cells in your tumor or proteins in your blood. It is anticipated that about 20 people will take part in this study from the Princess Margaret Cancer Centre.