Biotech startup challenges Bayer's Stivarga patent

27 July 2016

A San Francisco, USA-based biotech start-up has challenged the validity of a patent owned by German pharma major Bayer (BAYN: DE) on its cancer drug Stivarga (regorafenib).

In a statement, Fustibal confirmed it had filed an inter partes review (IPR) petition with the Patent Trial and Appeal Board (PTAB) of the ‘553 patent.

The patent, No 8,637,553, currently means that Stivarga, an oral multi-kinase inhibitor for the treatment of select patients with colorectal cancer and gastrointestinal stromal tumors, will enjoy exclusivity until 2031.

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