Randomization Required: Liver Signal Necessitated Kadcyla Trial With Control Arm

A pivotal trial with a control arm was necessary to evaluate a hepatotoxicity signal with Genentech’s Kadcyla, helping to derail a bid for accelerated approval based on a single-arm Phase II trial. Genentech’s strategy of running trials in different lines of treatment concurrently enabled a quick strategy shift as an ongoing controlled Phase III trial in another line was amended to meet FDA’s regulatory requests.