Phase III data boosts Roche’s ‘armed antibody’ cancer drug

Roche intends to submit its new T-DM1 breast cancer drug for EU and US approval this year following its successful phase III trial.

The biotech giant said its ‘armed antibody’ drug candidate, which combines the active agents of Herceptin and a chemotherapy drug, showed better progression-free survival data than a combination of Tyverb and Xeloda.

T-DM1, developed by Roche in partnership with ImmunoGen, is considered a potential successor to Roche’s blockbuster breast cancer drug Herceptin, which faces completion from biosimilars in 2015.

Herceptin has been approved in the EU for treatment of Her2-positive breast cancer, an aggressive type of cancer linked to a particular gene variant.

T-DM1 combines the antibody trastuzumab from Herceptin with the agent DM1from the chemotherapy drug maytansine.

Roche said that according to the EMILIA trial results, Her2-positive breast cancer patients showed longer progression-free survival than a combination of two major existing products: GSK’s Tyverb and Roche’s Xeloda.

In addition, it caused less side-effects (such as hair loss and reduced white blood cell count) than Herceptin alone, as well as offering the convenience of a combined medication.

The overall survival rates from the EMILIA trial are likely to become available by 2014.

Roche anticipates that T-DM1 will successfully rival generic versions of Herceptin and newer branded medications such as Tyverb.