Rethinking placebos: embracing synthetic control arms in clinical trials for rare tumors

César Serrano, Sara Rothschild, Guillermo Villacampa, Michael C. Heinrich, Suzanne George, Jean‐Yves Blay, Jason K. Sicklick, Gary K. Schwartz, Sameer Rastogi, Robin L. Jones, Piotr Rutkowski, Neeta Somaiah, Vı́ctor Navarro, Denisse Evans, Jonathan C. Trent