A Pilot Study of Pembrolizumab Combined With Stereotactic Ablative Radiotherapy for Patients With Advanced or Metastatic Sarcoma oleh Jeremy P. Harris MD, MPhil, Jino Park MD, Eric Ku MD, Steven Seyedin MD, Russell Stitzlein MD, Amanda Goldin MD, Wen-Pin Chen MS, Christine McLaren PhD, Allen M. Chen MD, Warren Chow MD