http://japanrunningnews.blogspot.com/20 ... tokyo.html
Aryasova was banned for two years for using HES (hydroxyethyl starch) - a substance apparently used for the purpose of concealing blood doping.
I can't remember the last time there was a doping DQ at a Japanese Marathon - in terms of it being the winner of a high profile race, this may be a first. Also, this is the first time I've heard of HES. Have new testing technique been developed to identify it?