Dear Kat,
I am not on tykerb, only Herceptin and Aredia. Therefore I have no brown spots at this time. All I know is my onc nurse called and said my echo was perfect, I do not know the numbers but have had 3 in 18 months. I should have one every 6 mo but the time slipped by and it was 9 mo since my last echo. Sorry I can't supply you more info but I'll try to remember to ask onc when I see him the numbers of my echo. The technician scared me, said something did not look right and wanted to give me an injection to get better readings, I refused. I told her if my onc needed it I would come back, obviously he was happy with results and did not need further testing.
hugs,
ginkott1@aol.com