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BEZ235 is an imidazoquinoline derivative inhibiting both PI3K and mTOR kinases with low nanomolar IC50s. It was well tolerated in preclinical animal studies as well as in clinical trials with manageable gastrointestinal side-effects[1, 2]. It competes with ATP by binding to the ATP-binding site of kinases and reversibly reduces enzyme activity, resulting in growth arrest of tumor cells in G1 phase[1]. Besides the inhibition of cell growth, BEZ235 blocks VEGF-induced angiogenesis[3]. It may also inhibit DNA-PKcs[4].

BEZ235 has shown potential anti-tumor activity both in vitro and in vivo. It inhibited growth of multiple cancer cell lines independently of mutation status in PI3K pathway[5]. In xenograft mice models, it blocked PI3K signaling and showed antitumor activity[1, 5]. Combination study demonstrated that it enhances the efficacy of temozolomide[1].

Clinical data shows anti-tumor activity of BEZ235 treatment, especially in cancer patients with deregulated PI3K signaling pathway. This compound is currently under investigation in multiple clinical trials either as monotherapy or in combination with other agents.

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