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I have received 14 responses to my query.
I thank you all.
The concensus is: not rely on tests, they are often errroneous.
If she was feeling good GF, Why not stay GF.
One said the Dr. should have done the biopsy in the beginning.
A few said the negative results are quite often erroneous, but not the
other way around.
Many thanks again,
Mireille.