Rich,
Here is my source of info on Her2+ and NIS:
http://www.nature.com/nature/journal.../406688a0.html
"In the breast-cancer cell line MCF-7, retonic acid has been shown to stimulate NIS expression and radioiodide uptake.
NIS is also expressed in the mammary tumors of mice whose cancers are caused by experimental overexpression of the oncogenes Her2/neu or ras."
Hopeful