BRIEF-S&P 500 to add Regeneron, drop MetroPCS

April 24 Wed Apr 24, 2013 5:19pm EDT

April 24 (Reuters) - * S&P says to add Regeneron Pharmaceuticals Inc to S&P 500 * S&P says Regeneron to replace MetroPCS Communications Inc which is

expected to merge with t-Mobile USA inc * S&P says change to be made after close of trading on April 30