[roz123]

jjames
you may want to go to bco.org. Under the her2 section there is an entire thread dedicated to her2 tumors under 5mm (or close as in your case). This may help you make a decision
I completely agree with Jean - her2 is sneaky and aggressive and does not behave like other bc.
as for the side effects of chemo, they are totally doable as you can see from all the women on this site who are many years out and living happy, healthy lives after treatment. Yes there are some long term side effects like chemo brain/fog and neuropathy but they are manageable
from my understanding TCH is less cardio-toxic then the alternative of ACT-H if the heart issue is of concern for you. Herceptin works best with chemo that's why most docs won't prescribe it seperately
As for oncotype score on her2, my onc said they do not do them b/c her2 guarantees chemo and oncotypes are done to determine the benefit of chemo - which is clear in her 2 cases

I would urge you to do the chemo/herceptin even for a 6mm tumor