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Here is a quote directly from the prescribing info for Herceptin:
"In studies using a loading dose of 4 mg/kg followed by a weekly maintenance dose of 2 mg/kg, a mean half-life of 5.8 days (range = 1 to 32 days) was observed."
I seem to remember reading something else that said herceptin is actually detectible longer than initially thought. In any case, note the range for half-life. Different people appear to respond dramatically different to this drug. I am not sure if other chemo tx will impact the body's ability to eliminate the drug.
Hope this helps...
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