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The nightly build http://www.w3.org/html/wg/drafts/html/master/dom.html#wai-aria indicates in the default implied semantics table that the ARIA radio role can't be used with the anchor element. Checkbox and menuitemradio as well as menuitemcheckbox are included so I believe this was an accidental omission.
have moved to html spec as that is where the mappings are defined
Role of option also seems like a good candidate for mapping to the anchor element.
moved to aria in html module https://github.com/webspecs/html-aria/issues/21