The California State Athletic Commission on Friday announced it suspended the license of Strikeforce women's featherweight champion Cristiane "Cyborg" Santos for one year, fined her $2,500 and changed a Dec. 17 victory to a "no decision."

A urine sample dropped the day before her title defense against Hiroko Yamanka came back positive for stanozolol metabolites, the CSAC revealed. Santos' sample was observed by a CSAC representative and sent to a World Anti-Doping Agency facility at UCLA.

Santos can appeal the suspension of her license, which is applied retroactively to Dec. 16.

Santos, 26, is widely considered the dominant female fighter in mixed martial arts. The Brazilian stopped Yamanaka on a Strikeforce card in San Diego in 16 seconds, putting her record at 11-1 before the change in result.

"Our primary concern is for the health and safety of fighters," said CSAC Executive Officer George Dodd. "Anabolic agents and other banned substances put not only the users of those agents at risk, but their opponents as well. The commission simply will not tolerate their use."

Strikeforce CEO Scott Coker did not immediately reply to a request for comment.

Josh Gross covers mixed martial arts for ESPN.com.