[Histonet] HER2 on upper GI biopsies

[Maray Weirauch]

We have had some oncologists asking for HER2 by IHC then reflexing for FISH if the IHC is negative or equivocal on upper GI tumors.
Our pathologists have been lookin for a recommended guideline to reflex for negatives in these types of cases, but haven't found any -- is anyone aware of FISH testing guidelines on GI cases?
Thanks in advance!