The Value of 68Ga-grazytracer PET in Monitoring Responses to Immunotherapy of Advanced Soft Tissue Sarcomas

This study is evaluating whether a special type of PET scan using a tracer called 68Ga-grazytracer can better track how well immunotherapy is working in patients with advanced soft tissue sarcomas (cancers that develop in muscles, fat, nerves, or connective tissue). **You may be eligible if...** - You are between 6 and 80 years old - You have been diagnosed with an advanced soft tissue sarcoma (such as liposarcoma, synovial sarcoma, leiomyosarcoma, rhabdomyosarcoma, or similar types) - Your doctor has recommended immunotherapy or immunotherapy combined with other treatments - You are able to follow the study procedures **You may NOT be eligible if...** - You have serious conditions such as severe heart or lung failure, severe bone marrow suppression, or major kidney or liver problems - You have a complete intestinal blockage or intestinal perforation - You are pregnant, possibly pregnant, or breastfeeding - You are unwilling or unable to comply with the study requirements Talk to your doctor to see if this trial is right for you.