B-Raf, also know as c-Rmil, is a Serine/Threonine protein kinase member of the Raf family which includes Raf-1 and A-Raf. B-Raf is involved in the transduction of mitogenic signals from the cell membrane to the nucleus (1). Composed of three conserved region (CR1, CR2, CR3) B-Raf is expressed primarily in the brain and in the nervous system (2). It has been observed that MAPK is activated by B-Raf in response to nerve growth factor (3). More than 60% of malignant melanomas were found to contain a specific mutation, B-Raf (V599E) the product of which possesses constitutive kinase activity (4). Mutations in B-Raf have also been identified in lung cancer and non-Hodgkin lymphoma.