Hey Becky,
It's my understanding that this is because the international trial (HERA) allowed women to enroll up to 6 months after they completed chemo (and/or radiation). The reality is that most women started much sooner than that. But since there is, at least on paper, a clinical trial that supported the idea that you could use herceptin up to six months after completion of other adjuvant treatment, doctors seem to be accepting this as a standard of care.
It's about as scientific as anything else out there. Which is to say, not very.
Good luck!
Jeff
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