July 27 (Reuters) - Astrazeneca Plc AZN.L :
* Valeant announces U.S. launch of siliq (brodalumab) injection
* Valeant says that its dermatology unit will be renamed Ortho Dermatologics, effective immediately
* Valeant says under new senior leadership team lead by Bill Humphries, executive vice president and company group chairman, Ortho Dermatologics
* Valeant - siliq has a black box warning for "risks of suicidal ideation and behavior"