Early stage HER2++ without recurrence

What are the statistics. in early stage node neg. HER2++ without a recurrence? What is the longest time span from diagnosis without a recurrence that we know of (without Herceptin) and only A/C chemo + Tamoxifen or Arimidex? I am 5 yrs. out in Nov. since DX ... at this point I believe my chances for recurrence are about the same as a HER2 neg. person. I am very curious as to how many HER++ recur after 5 yrs, I don't think they have been testing much longer than 5 or 6 years have they?