Stat5 protein marker??

I saw this in a previous post. Has anyone heard of the stat5 protein marker or been tested for it? My mother saw it on CNN earlier this month, and I am not familiar with it, nor was my oncology nurse. Anyone have any information??

http://www.curebreastcancer.org/modu...rticle&sid=194

Apparently it's a test done on tumor tissue. If it's present it means a more favorable prognosis.

Thanks for the link Lolly

Has anyone had this test done?