Michka following links show sites where t-dm1 are looking for participants.
Marianne phaseIII trial - 1st line MBC
http://www.clinicaltrials.gov/ct2/sh...ow_locs=Y#locn
Emilia phaseIII trial - 2nd line MBC
http://www.clinicaltrials.gov/ct2/sh...ow_locs=Y#locn
T-DM1 vs physician's choice - 3rd line MBC
http://www.clinicaltrials.gov/ct2/sh...ow_locs=Y#locn
A phaseI about to get underway
http://www.clinicaltrials.gov/ct2/sh...tansine&rank=1
Looking with search key "t-dm1" or "emtansine" in http:/www.clinicaltrials.gov repository will show number of still active trials.
Hope this helps.