I think that Immunogen and Genentech may be working together on a new one:
http://www.corporate-ir.net/ireye/i...&item_id=852586
From Immunogen investor relations:
"Trastuzumab-DM1 . Phase I testing in patients with HER2-positive metastatic breast cancer began in April 2006." It is a tumour activated prodrug. This one sentence is all of interest in the press release.
DM1 seems to be a compound that Immunogen own and they are working with Genentech to manufacture it:
http://news.morningstar.com/news/MW/...pgid=qtqnNews5