sarahlouise, I'm posting the link to the other thread on this topic below.
http://forum.breastcancercare.org.uk/t5/Treatments-and-medical-issues/Subcutaneous-Hercepin-for-seco...s/m-p/767830/highlight/false#M10160
I found out about it originally from blondie's thread "10 years on" in secondary success stories.
Sarah.x