Hi there, I have heard an entirely different version. I was on weekly, then 2 weekly and now triple every 3 weeks. The only reason they usually take you off is if an echocardiogram shows that the left ventricle in your heart is not functioning enough, or not working of course, I had 5 weeks between doses when I was in hospital for a thyroid problem which complicated into heart failure. Even after that my Left Ventricle was fine and I went back on it. I was told that the herceptin stays in your system for 5 to 6 weeks so I wasn't too worried. The other thing was that when I stopped the Navelbine I was having with it I started taking Aromasin, similar to Tamoxefin. I had complained of a lump in my neck since last June and that was when the thyroid problem was uncovered. My CA15-3 tumour marker was down to 7 the lowest it has ever been, my CT was normal, but the lump in my neck did not show up, but was biopsied under ultra sound, and it apparently has similar cancer cells that were in the original left side at the original site, so I am confused, my onc thinks it may be a different strain, but having radiation for the new outbreak, I hope I haven't alarmed you I have been doing this since 1998 and a regular visitor to this site, so you are not alone with this nightmare.
Hugs Lyn.
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