Integrated Health Services Inc. dropped its $551.5-million bid to acquire Coram Healthcare Corp., scuttling plans to create one of the largest U.S. home-health-care companies. The decision was made in part because of a disagreement over litigation tied to Coram's 1995 acquisition of a Caremark International Inc. unit, Coram said. . . . The Federal Trade Commission has opened an inquiry into whether ads by Miller Brewing Co., a unit of Philip Morris Cos., and Anheuser-Busch aim advertising at underage drinkers, the companies said. Both companies said they do not target underage drinkers. . . . Dow Corning Corp. asked a bankruptcy court judge to throw out the more serious claims about its breast implants because of insufficient evidence. The request with the bankruptcy court would allow people to pursue claims involving ruptures and minor complications.