@CytoJC The case u refer to was the 1 AcCC that was neg for NR4A3 IHC on both FNA & resection. We don't have a definite explanation for why. It was also neg for MSANTD3 FISH. We hypothesized that maybe NR4A2 was involved in this case - but we didn't stain for it so did not prove it.
@CytoJC It certainly would be nice, since IHC is cheaper & faster. But NR4A3 works better than other IHC stains for H&N tumors we have tried in our lab. For instance, we have not found great success w/ PLAG1 & HMGA2 IHC.
@CytoJC Oddly, the FNA of the primary showed only 1+ positivity (weak staining) while the LN met showed 3+ positivity (strong staining). I don't remember if there were low-grade areas in the primary resection - would have to check.
@CytoJC We wanted to give DOG1 a fighting chance, so we scored it using 2 different thresholds (any memb/cytopl staining vs. circumferential). Since it shows different patterns, we weren't sure which threshold was best and assessed both.
@VarshaManuchaMD@CytoJC I would add that normal acini & AcCC cells can be intermixed, so the tumor cells can be missed if u are only relying on DOG1. The apical or circumferential staining can be weak and not obvious.