Focus of T-DM1 trials is to overcome poor response to or acquired resistance to herceptin in her2+ patients.
Here's link to couple of trial possibilities:
T-DM1 & Pertuzumab trial In Columbus, Ohio
http://www.clinicaltrials.gov/ct2/show/NCT00943670?term=t-dm1&rank=2
T-DM1 combo trial conducted in neighboring states.
http://www.clinicaltrials.gov/ct2/show/NCT00928330?term=t-dm1&rank=7
further away, but another promising combo trial
http://www.clinicaltrials.gov/ct2/show/NCT00951665?term=t-dm1&rank=6
one more in Indiana
http://www.clinicaltrials.gov/ct2/show/NCT00875979?term=t-dm1&rank=5