Hi Megan,
I don't know if you still check into this forum but I saw your post today. Genetic links where identified in 2015. My 5cm+ Borderline Phyllodes was removed from my left breast in Sept 2015. Since then I have been taking a very keen interest in the genetic links. As it's so rare few studies exist, but the studies that do exist are valuable. I obtained a raw data file of my DNA using a genealogy serve of all things and ran the data through the American medical wiki 'Prometheus' a respected wiki that is linked to the most significant peer reviewed medical data bases in the world. Sure enough, I have both genes identified in the Michigan study. See the second link I have supplied here. In addition I am also carrying the standard cancer genes BRAC1 and BRAC2......