Here is a link to a timely abstract in the NEJM
http://www.nejm.org/doi/full/10.1056...4700?query=TOC Unfortunately, the full article is not available for free. The conclusion, though is interesting - extended AI therapy resulted in longer disease free survival, but they were unable to demonstrate an increase in overall survival. The extended therapy also was effective in preventing additional bc in the unaffected breast.
Hopeful