OnCure Holdings Inc., which provides equipment and management services to cancer clinics in three states, filed for bankruptcy blaming cuts in federal health-insurance payments, Bloomberg News reported yesterday. OnCure, based in Englewood, Colo., plans to sell itself at auction while under court protection, with an initial bid of $125 million from an undisclosed company, Chief Executive Officer Bradford Burkett said. The company listed assets of $179.3 million and debt of $250.4 million in a court filing. The case is In re OnCure Holdings, Inc., 13-bk-11540, U.S Bankruptcy Court, District of Delaware (Wilmington).