December 20, 2019

December 20, 2019 – The U.S. FDA has approved Enhertu® (fam-trastuzumab deruxtecan-nxki), manufactured by Daiichi Sankyo, to treat adult patients who have unresectable or metastatic HER2-positive breast cancer and have been treated with at least two prior anti-HER2-based regimens in the metastatic setting.

Breast cancer is the most common form of cancer diagnosed in women in the United States. Approximately one in five breast cancers is HER2-positive, meaning the cancer cells possess a genetic mutation that causes overproduction of human epidermal growth factor receptor 2 (HER2) – a protein that causes these cancers to be more aggressive. Metastatic breast cancer, which is cancer that has spread through the body, has a five-year survival rate of just 22%.

In a clinical trial, Enhertu delivered an overall response rate of 60.3% and a median duration of response of 14.8 months. Women who took part in the trial had been treated with anywhere from two to 17 different therapies before beginning treatment with Enhertu. Recommended dosing is 5.4mg/kg of body weight administered via intravenous infusion once every three weeks until disease progression or unacceptable toxicity. A black box warning cautions that there is a risk of interstitial lung disease, which can be fatal, and embryo-fetal toxicity.

Enhertu is expected to launch in January 2020 at a wholesale acquisition cost of $2,295.97 for a 100mg vial.

 

Actual drug patent expiration dates and availability of new medications are subject to change due to patent litigation, settlement agreements, additional patents, exclusivities, and final FDA approval. Distribution and availability of new medications at pharmacies may not occur immediately following FDA approval. Patients are advised to speak with their healthcare professional or pharmacist regarding appropriateness as well as actual availability.

*This is provided for information only. The reference to any medication above does not mean the medication is covered by your plan.

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