Grant & Eisenhofer has quietly resolved a contentious dispute over allegations that a former firm lawyer, whistleblower attorney Reuben Guttman, poached a client in a lucrative False Claims Act lawsuit against cancer drug manufacturer Celgene Corp.

Those involved in the dispute—Grant & Eisenhofer on one side and, on the other, Guttman, his current Washington, D.C.-based firm Guttman, Buschner & Brooks and whistleblower client Beverly Brown, a former Celgene saleswoman—filed a joint stipulation Tuesday looking to dismiss litigation playing out in Los Angeles federal court. The filing cited a negotiated settlement that would require each side to pay its own attorney fees and costs.