Rubius Therapeutics is developing Red-Cell Therapeutics™ (RCTs™) as a new class of medicines to address a wide array of indications, with leading applications in cancer, rare and autoimmune disease, as well as additional potential in hemophilia, infectious and metabolic diseases. The company was founded and launched in 2014 by Flagship VentureLabs®, the innovation foundry of Flagship Pioneering. Rubius has successfully engineered and manufactured red cells that express therapeutic proteins for use in the treatment of serious diseases. The company is now demonstrating that these newly equipped high performing, off-the-shelf Red-Cell Therapeutics have pre-clinical activity across a spectrum of medical applications. Rubius has generated more than 200 prototypes to date.