Actually, he won the 2007 AND the just completed 2008 Iditarod - here's a link to info about his latest win http://iditarodblogs.com/news/2008/03/12/double-trouble-mackey-wins-again/

Ginny M. SCC of Left lateral tongue Dx 04/06,Surgery MDACC 05/11/06: Partial glossectomy with selective neck dissection. T1N0M0 - no radiation. Phase III clinical trial ("EPOC" trial)04/07 thru 04/08 because tests showed a 65% chance of recurrence. 10 Year Survivor!