NK2 homeobox 1

Otherwise, we won't be able to finish our work.

That case, it was CK7 positive, TTF1 positive.

It was reported as a lung adeno.

End of the story.

And one thing is that we need to be aware of the IHC.

So IHC for adenocarcinoma is positive for TTF1 as well as cytokeratin celibin.

One caveat is that cytokeratin 20 is more prevalent in adenocarcinoma of the GI tract.

So if you're working up a cancer of unknown primary and it's CK7 positive, think adenocarcinoma above the diaphragm, lung.