Breast Cancer :: GlaxoSmithKline announces Swiss approval of Tyverb, a new oral treatment for advanced breast cancer

GlaxoSmithKline announced an important milestone for advanced breast cancer patients across Europe with approval of the first oral ErbB1 and ErbB2 dual inhibitor, Tyverb? (lapatinib).

Lapatinib, in combination with capecitabine, received approval from Switzerland?s regulatory authority,Swissmedic,for the treatment of patients with advanced ormetastatic breast cancer whose tumours overexpress ErbB2 (HER-2) and who have relapsed after, or not responded to, trastuzumab therapy.

Lapatinib is a small molecule that is administered orally and works by getting inside the cancer cell and inhibiting two receptor proteins ? the tyrosine kinase components of ErbB1 and ErbB2 receptors, which are responsible for tumour growth. This innovative mechanism of action is a new way to treat breast cancer and is different from current targeted therapies for ErbB2 positive disease.

This approval was based on a pivotal Phase III trial (EGF100151) in women with advanced ormetastatic ErbB2 positive breast cancer whose disease had progressed following treatment with trastuzumab and other cancer therapies. The data showed that the median time to progression was 27.1 weeks on the combination of lapatinib and capecitabine versus 18.6 weeks on capecitabine alone (hazard ratio 0.57 (CI 0.43, 0.77) p=0.0001). The response rate was 23.7% versus 13.9% (p=0.017).

The most common adverse events during therapy with lapatinib plus capecitabine were gastrointestinal (diarrhoea, nausea and vomiting) or skin toxicities (hand and foot syndrome and rash). The majority of adverse events and laboratory abnormalities were mild to moderate in severity and were not significantly higher than those seen with capecitabine monotherapy.

“This is an extremely significant and exciting breakthrough for patients and physicians across Switzerland. Lapatinib offers patients an effective, well-tolerated treatment and as an oral therapy offers added convenience for patients. Lapatinib is now available in Switzerland and subject to regulatory approval we remain ontrack to launch lapatinib in the rest of Europe during the second half of 2007” said Paolo Paoletti, SVP and Global Head of the Oncology Medicine Development Centre at GSK. “The approval of lapatinib demonstrates our R&D organisation?s strong commitment to the discovery and development of novel cancer treatments. We are dedicated to the further study and development of lapatinib in a variety of settings including early breast cancer as well as in other types of cancer.?


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