LOS ANGELES--(BUSINESS WIRE)--KYTHERA Biopharmaceuticals, Inc. (KYTHERA) today announced the completion of enrollment in two pivotal U.S. and Canadian Phase III clinical trials of ATX-101, a potential first-in-class injectable facial aesthetic drug under clinical investigation for the reduction of submental fat, which commonly presents as an undesirable “double chin.” KYTHERA expects to release top-line results in mid-2013.