Background
Soft tissue sarcomas (STS), a rare collection of cancers originating from connective tissues, have proven difficult with immune-based therapies. Although anti PD1 antibodies, and other new immune therapies, have been successful in treating some cancers like lung cancer and melanoma, these drugs have yielded poor results for STS patients in clinical trials. The outcomes are likely due to the minimal immune activation at baseline against the tumors, and the sarcomas have fewer DNA mutations, therefore, they have fewer potential immune targets.