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20-25% are her2positive, depending on the test utilized.Supposedly 10% of those are er and pr positive. Are you sure you have the path report right?
Did you have an area of DCIS? Does the 3mm refer to the size of the tumor or the size of the area of involved margin resected at the time of partial mastectomy?
If 3mm is the only size of the tumor, and no other area of DCIS, he/she may mean that you caught it so early that you represent 1% of all breast cancers by size.
Chemo plus herceptin works specifically for her2positive( by FISH) er and pr negative tumors.
Noone yet knows what works best for the 2% of all breast tumors that are her2positive and also er/pr positive, although we hope some info at the ASCO meeting might give us an idea.
Normally chemotherapy works best in er/pr negative tumors.
You can get a second opinion, usually for less than $250 on your pathology, as not all hospitals do the tests for her2 equally well.
Where do you live?
Hope this helps!
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