Unrelated - have you looked at the Mistletoe link or any knowledge in this area?
Here are some links I found on a site called THe Vitamin Foundation from a google search.
This looks like research on the edge and so definative answeres on how it works with Herceptin I guess will not be easy to find. I found nothing on the first page of a search for Herceptin and Vitamin C.
The first is worth skimming at least. It is informative on the role of antioxidants and cancerous cells. More reading! The rest I have no looked at but a glance look relevant to the generality of the question.
RB
http://www.positivehealth.com/permit.../calvino71.htm
ntravenous Ascorbate as a Tumor Cytotoxic Chemotherapeutic Agent
http://www.cancer.gov/clinicaltrials...allpages/print
http://www.annals.org/cgi/reprint/140/7/533.pdf
Vitamin C Pharmacokinetics: Implications for Oral and Intravenous Use
http://www.annals.org/cgi/content/abstract/140/7/533