"NEW" weapons in arsenal, indeed very important, maybe even more important is technology incorporated in these state-of-the-art weapons continuous to be improved upon; so new agents of today,become the foundation for even more efficacious treatments in the future.
According to article, T-DM1 once approved, will be prescribed by many of the ASCO attending oncologists.
http://www.oncbiz.com/blog/2012/06/o...ollowing-asco/