There are 2 vaccine studies at University of Washington that are linked on the News page of this site; the one I'm enrolled in is the Phase I-II Herceptin/Vaccine trial and allows Herceptin use, and also allows one to have either STABLE DISEASE or be NED, although the study outline says NED...don't know why they haven't fixed that. As Annemarie says, you do have to be HLA-A2 positive; that's a marker they will use to track the antibody response. Here's the link to the Herceptin/Vaccine trial:
http://depts.washington.edu/tumorvac/synopsis2.html