The V600E mutation of B-Raf kinase results in constitutive activation of the MAPK signaling pathway and is present in approximately 7% of all cancers. Using structure-based design, a novel series of pyrazolopyridine inhibitors of B-Raf(V600E) was developed. Optimization led to the identification of 3-methoxy pyrazolopyridines 17 and 19, potent, selective, and orally bioavailable agents that inhibited tumor growth in a mouse xenograft model driven by B-Raf(V600E) with no effect on body weight. On the basis of their in vivo efficacy and preliminary safety profiles, 17 and 19 were selected for further preclinical evaluation.
Although mannitol plus hydration is used to decrease cisplatin-induced nephrotoxicity, there are no compelling data that the addition of mannitol is more nephroprotective than the use of hydration alone. Appropriate hydration remains the most reasonable strategy to reduce the incidence of cisplatin-induced nephrotoxicity.
Vemurafenib offers a novel, first-line, personalized therapy for patients who have mutated BRAF. Clinical trials of vemurafenib in combination with ipilimumab or other targeted or cytotoxic chemotherapeutic agents may provide more effective regimens with long-term clinical benefit.
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