Trastuzumab Emtansine-Kadcyla 160 mg Injection


We don’t know how this treatment might affect fertility. You may not be able to become pregnant or father a child after treatment with this drug. Talk to your doctor before starting treatment if you think you may want to have a baby in the future.

Some men might be able to store sperm before starting treatment. Some women might be able to store eggs or embryos before treatment.

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Trastuzumab emtansine is pronounced trast-oo-zoo-mab em-tan-seen. It is a combination of the drug trastuzumab and a drug called emtansine. It is also known by its brand name, Kadcyla (pronounced cad-sigh-lah].

It is a treatment for HER2 positive breast cancer that has come back or spread to other parts of the body. You usually only have it if you have had treatment with trastuzumab (Herceptin) and a drug known as a taxane.

You may also have it as part of clinical trials for other types of cancer.

How it works

Trastuzumab is a type of targeted cancer drug (biological therapy) called monoclonal antibody. Emtansine is a cancer drug that becomes active once Kadcyla enters the cancer cell.

Some breast cancers have too much of a protein called human epidermal growth factor receptor 2 (HER2) on the surface of their cells. These are called HER2 positive cancers. HER2 makes the cells grow and divide. Trastuzumab attaches to the HER2 receptor. When this happens it allows the emtansine to go into the cancer cell. Inside the cell emtansine becomes active and kills the cancer cell.

How you have it

Trastuzumab emtansine is a clear fluid. You have it into your bloodstream (intravenously).

Drugs into your bloodstream

You have the treatment through a drip into your arm. A nurse puts a small tube (a cannula) into one of your veins and connects the drip to it.

You might need a central line. This is a long plastic tube that gives the drugs into a large vein, either in your chest or through a vein in your arm. It stays in while you’re having treatment, which may be for a few months.

When you have it

You have trastuzumab emtansine every 3 weeks. You have the first treatment over 90 minutes. You might have the next treatments over 30 minutes if the first one went well. 

You continue to have treatment as long as it helps and the side effects aren’t too bad.

Tests during treatment

You have blood tests before starting treatment and during your treatment. They check your levels of blood cells and other substances in the blood. They also check how well your liver and kidneys are working.

Important information

Other medicines, foods and drink

Cancer drugs can interact with some other medicines and herbal products. Tell your doctor or pharmacist about any medicines you are taking. This includes vitamins, herbal supplements and over the counter remedies.

Pregnancy and contraception

This drug may harm a baby developing in the womb. It is important not to become pregnant or father a child while you are having treatment with this drug and for at least 7 months afterwards. Talk to your doctor or nurse about effective contraception before starting treatment.


Don’t breastfeed during this treatment and for 7 months afterwards. The drug may come through in the breast milk.



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