Bloomberg Markets with Carol Massar and Cory Johnson. GUESTS: Dani Burger Stocks Reporter Bloomberg News Discussing her story "For Quants, Megacap Tech Rout Looks Like a Systematic Unwind." David Wilson Stocks Editor Bloomberg News Discussing his "Stock of the Day"Bluebird Bio (BLUE). Bluebird Bio Inc.'s shares fell for the first time in eight days after a cancer therapy it's pursuing suffered a setback. Novartis AG treatment a study of the treatment for a form of leukemia because it wasn't effective, according to a U.S. government website that tracks drug research. Bluebird Bio is pursuing the therapy to treat a blood cancer, called multiple myeloma. The stock had surged 48 1/2 percent in the previous seven trading days.