Kadcyla is a combination of herceptin and a chemo called mertansine. I read in a nursing magazine that the main dosing mistake is when they give it in the same strength as herceptin, so they changed the name from trastuzumab to ado-tratuszumab to prevent it from being misread. It is supposed to be 3, not 6, (and I can't finish that sentence because I can't remember the mKGb or whatever it is). But that mistake is rare and you can look online for package insert with the dose and the ingredients and ask before you get it, which is very smart.
Good luck to you, here's hoping it is the answer for you! It will be my next chemo so I'm interested in your experience.
Edited to add the wikipedia page:
http://en.wikipedia.org/wiki/Trastuzumab_emtansine
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http://butdoctorihatepink.com
08/17/09 Dx'd.
Multifocal/multicentric IDC, largest 3.4 cm, associated ADH, LCIS, DCIS
HER2+ ER+/PR- Grade 3, Node Negative
10/20/2009: Right mastectomy, reconstruction with TE
12/02/2009: Six rounds TCH, switched to Taxol halfway through due to neuropathy
03/31/2010: Finished chemo
05/01/2010: Began tamoxifen, the worst drug ever
11/18/2010: Reconstruction completed
12/02/2010: Finished herceptin
05/21/2011: Liver Mets. Quit Tamoxifen
06/22/2011: Navelbine/Zometa/Herceptin
10/03/2011: Liver Resection, left lobe. Microwave ablation, right lobe - going for cure!
11/26/2011: C-Diff Superbug Infection, "worst case doctor had seen in 20 years"
03/28/2012: Progression in ablated section of the liver - no more cure. Started Abraxane, continue herceptin/zometa
10/10/2012: Progression continues, started Halaven, along with herceptin and zometa.
01/15/2013: Progression continues, started Gemzar and Perjeta, an unusual combo, continuing with herceptin and zometa
03/13/2013: Quit Gemzar, body just won't handle it. Staying on herceptin, zometa and perjeta.
04/03/2013: CT shows 50% regression in tumor, so am starting back on Gemzar with dose reduction, staying with perjeta/herceptin/zometa. Can't argue with success!
05/09/2013: Discussing SBRT with Radiology due to inability of bone marrow to recover from chemo.
06/07/2013: Fiducial placement for SBRT
07/03/2013: Chemo discontinued, on Perjeta, Herceptin and Zometa alone
07/25/2013: SBRT (gamma knife) begins
08/01/2013: SBRT completed
08/15/2013: STABLE! continuing with Perjeta, Herceptin, Zometa
06/18/2014: ***** NED!!!!***** continuing with Perjeta, Herceptin, Zometa
01/29/2014: Still NED. continuing with Perjeta, Herceptin. Zometa lowered to every 3 months instead of monthly.
11/08/2015: Progression throughout abdomen and lungs. Started TDM-1, aka Kadcyla. Other meds discontinued. Remission was nice while it lasted.
5/27/18: Stable. Kadcyla put me right back in the barn. I have two teeny spots on my lungs that are metabolically inactive, and liver is clean.
I’m beating this MFer. I was 51 when this started and had two kids, 22 and 12. Now I’m 60. My oldest got married and trying to start s family. My youngesg graduates from Caltech this June. My stepdaughter gave me grandkids. Life is fantastic.