Washington University at St. Louis is currently doing a study of the specific genetic factors which are present in young women with breast cancer. This is not specifically designed for her2+. However, with so many of her+ being younger, it certainly will apply. The criteria is that you must be under 40 at diagnosis (regardless of current age) and willing to submit a blood sample and health information. Additionally, if you have parent(s) still living, they want their health info and blood sample(s). My parents and I have received the info and are in the process of returning it.
If interested, you can contact
jen@ccadmin.wustl.edu.
It's not exactly what you were looking for, but it may be helpful to some.