How long does it take for Kadcyla to work?

[Tonya]

I am on my fourth dose of kadcyla and was wondering how many doses did you have before ca15-3 starting dropping? After the second dose it leveled off at 366 and next does only dropped it 6 points and now today it has taken a jump up over 150 points. My Doctor Wanted me to try one more round and check markers again. I am praying for a big miracle in the next 3 weeks to pull these markers back down. Any helpful information? bc2002 IV since 2007 liver mets, ovary involvement.Running out of options fast. Tonya