I have been using a site that Johns Hopkins recommends. I'm not sure if anyone has mentioned this site before.
adjuvant!
This gives a good graphical representation of the benefits of the different treatment scenarios with Herceptin from the trials. Another option on the site is to enter your tumor size, hormonal and nodal status and get recurrence rates and treatment benefits with various regimens. The statistics are a little sobering but very informative. The site is intended for medical professionals so you need to enter some bogus information to register.