BRIEF-Bristol Myers says research chief Sigal had been mulling retirement for months

April 8 Mon Apr 8, 2013 9:33am EDT

April 8 (Reuters) - BRISTOL-MYERS: * Bristol-Myers CEO says research chief Elliott Sigal mentioned a few months ago his interest in retiring * Bristol-Myers CEO says in conference call that Sigal retiring after successful launch of Eliquis blood clot preventer * Bristol-Myers says will retain strong focus on oncology, neuroscience