Shares of Revolution Medicines Inc. (NASDAQ:RVMD) tumbled in after-hours trading on Wednesday after AbbVie Inc. (NYSE:ABBV) denied reports that it was in talks to acquire the cancer-drug developer, reversing an over 28% rally sparked by the takeover speculation.Report Lifts AbbVie Stock Too As Investors Cheer Oncology ProspectsThe Wall Street Journal reported on Wednesday that AbbVie was in advanced talks to buy Revolution Medicines, but the terms and a potential purchase price were not disclosed. Revolutio ...