Here are the figures taken from the Press Release on 2nd June 2013:
Breast cancer recurred in 580 women from the 3,468 taking tamoxifen for ten years, compared to 672 of 3485 women who stopped tamoxifen after five years.
There were 849 deaths among the ten year tamoxifen group compared to 910 deaths in the five year tamoxifen group.
Interesting. I wonder if there are any studies under way on taking long term AIs?
If anyone is interested in the paper which was presented at the conference then you can link to it here: