There was also a trend for patients who received trastuzumab emtansine to live longer (overall survival, or OS, the other co-primary endpoint of the study) than those who received lapatinib plus Xeloda, but these data are currently not mature. The safety profile of trastuzumab emtansine was consistent with that seen in previous studies, with fewer patients who received trastuzumab emtansine experiencing Grade 3 or higher (severe) adverse events (AEs) than those who received lapatinib plus Xeloda (40.8 percent compared to 57 percent).
The EMILIA data will be presented in the plenary session at the 48th Annual Meeting of the American Society of Clinical Oncology (ASCO) in Chicago by Kim Blackwell, M.D., Duke University School of Medicine (Abstract #LBA1, Sunday 3 June at 1:45 pm CDT). The EMILIA data were also featured in the official ASCO press programme on Saturday 2 June.
“The encouraging efficacy, safety profile and quality of life results from the EMILIA study support our belief that trastuzumab emtansine may have an important role for patients with HER2-positive metastatic breast cancer,” said Hal Barron, M.D., Chief Medical Officer and Head, Global Product Development. “We are working with global regulatory authorities to submit these data as quickly as possible and hope that trastuzumab emtansine will soon be available to patients with this aggressive type of breast cancer.”
Based on the EMILIA findings, Roche and Genentech plan to submit applications for trastuzumab emtansine in HER2-positive mBC this year to the European Medicines Agency (EMA) and US Food and Drug Administration (FDA).
Trastuzumab emtansine is an investigational medicine known as an antibody-drug conjugate (ADC). It is comprised of the antibody trastuzumab and the chemotherapy DM1 attached together using a stable linker. Trastuzumab emtansine is designed to target and inhibit HER2 signalling and deliver the chemotherapy directly inside HER2-positive cancer cells.
About the EMILIA study
EMILIA (TDM4370g/BO21977) is an international, Phase III, randomised, open-label study comparing trastuzumab emtansine alone to lapatinib in combination with Xeloda in 991 patients with HER2-positive locally advanced or metastatic breast cancer whose disease progressed after initial treatment with Herceptin and a taxane-based chemotherapy.
Participants in the trastuzumab emtansine arm received:
Participants in the lapatinib plus Xeloda arm received:
The co-primary efficacy endpoints of the study are PFS (as assessed by an independent review committee) and OS. Safety is also a primary endpoint of the study. Other study endpoints include and one-year and two-year survival rates, safety profile, PFS as assessed by investigator, objective response rate, duration of response and quality of life.
About trastuzumab emtansine
Trastuzumab emtansine is an ADC being studied in HER2-positive cancers. It is comprised of the antibody trastuzumab and the chemotherapy agent DM1 attached together using a stable linker. Trastuzumab emtansine is designed to target and inhibit HER2 signalling and deliver the chemotherapy agent DM1 directly inside HER2-positive cancer cells. Trastuzumab emtansine binds to the HER2-positive cancer cells, and is thought to block out-of-control signals that make the cancer grow while also calling on the body's immune system to attack the cancer cells. Once trastuzumab emtansine is absorbed into those cancer cells, it is designed to destroy them by releasing the DM1.
In addition to EMILIA, there are two ongoing Phase III studies of trastuzumab emtansine:
Genentech, a member of the Roche Group, licenses technology for trastuzumab emtansine under an agreement with ImmunoGen, Inc.
Building on the results of trastuzumab emtansine studies to date, Roche/Genentech have approximately 25ADCs in the pipeline.
About breast cancer
Breast cancer is the most common cancer among women worldwide. Each year about 1.4 million new cases of breast cancer are diagnosed worldwide, and over 450,000 women will die of the disease annually.(1) In HER2-positive breast cancer, increased quantities of the human epidermal growth factor receptor 2 (HER2) are present on the surface of the tumour cells. This is known as "HER2 positivity" and affects approximately 15-20 percent of women with breast cancer.(2) HER2-positive cancer is a particularly aggressive form of breast cancer.(3)
Headquartered in Basel, Switzerland, Roche is a leader in research-focused healthcare with combined strengths in pharmaceuticals and diagnostics. Roche is the world's largest biotech company with truly differentiated medicines in oncology, virology, inflammation, metabolism and CNS. Roche is also the world leader in in-vitro diagnostics, tissue-based cancer diagnostics and a pioneer in diabetes management. Roche's personalised healthcare strategy aims at providing medicines and diagnostic tools that enable tangible improvements in the health, quality of life and survival of patients. In 2011, Roche had over 80,000 employees worldwide and invested over 8 billion Swiss francs in R&D. The Group posted sales of 42.5 billion Swiss francs. Genentech, United States, is a wholly owned member of the Roche Group. Roche has a majority stake in Chugai Pharmaceutical, Japan.
1. Ferlay J, Shin HR, Bray F, Forman D, Mathers C and Parkin DM. GLOBOCAN 2008, Cancer Incidence and Mortality Worldwide: IARC Cancer Base No. 10 [Internet]. Lyon, France: International Agency for Research on Cancer; 2010. Available from: http://globocan.iarc.fr.
2. Wolff A.C et al. American Society of Clinical Oncology/ College of American Pathologists Guideline Recommendations for Human Epidermal Growth Factor Receptor 2 Testing in Breast Cancer. Arch Pathol Lab Med - Vol 131, January 2007.
3. Slamon D et al. Adjuvant Trastuzumab in HER2-Positive Breast Cancer. N Engl J Med 2011; 365:1273-83.