GSK plc said in paperwork filed with the U.S. SEC that the potentially whopping deal inked in the summer of 2020 with Ideaya Biosciences Inc. has gone down the tubes. The two firms were collaborating on three of Ideaya’s synthetic lethality programs, MAT2A (methionine adenosyltransferase 2a), Pol Theta (polymerase theta) and Werner Helicase.