Adds details from the report in paragraph 4 June 15 (Reuters) - Software firm Oracle ORCL.N on Thursday laid off hundreds of employees, rescinded job offers and cut back open positions within its health unit, the Insider reported, citing three people familiar with the matter. The layoffs follow thousands of cuts in corporate America as companies wrestle with elevated levels of inflation and rising interest rates. Oracle's health unit includes electronic medical records firm Cerner which it acquired for $28.3 billion, its biggest ever deal, in December last year.