First Patient Dosed in Trial of Sitravatinib in Combination with Tislelizumab

Mirati Therapeutics announced dosing of the first patient under its collaboration agreement with BeiGene in a Phase 1b clinical trial to assess the safety and tolerability, pharmacokinetics and preliminary anti-tumor activity of Mirati's sitravatinib in combination with BeiGene's investigational anti-PD1 antibody, tislelizumab, in patients with advanced solid tumors. The clinical trial is currently enrolling patients in China and Australia. "We're excited to move into the next phase of our collaboration with BeiGene. BeiGene's ability to rapidly enroll patients into this clinical trial has the potential to significantly expand and accelerate our development efforts for sitravatinib and provide access to additional patient populations," said Charles Baum, M.D., Ph.D., President and Chief Executive Officer of Mirati. "This clinical trial also has the potential to provide proof of concept clinical data in multiple solid tumor types." This initial open-label, multicenter, non-randomized Phase 1b clinical trial is designed to assess the safety and tolerability in patients with histologically or cytologically confirmed locally advanced or metastatic non-squamous, non-small cell lung cancer (NSCLC), renal cell carcinoma, and ovarian cancer. Patients will receive 120 mg of oral sitravatinib, daily, and 220 mg of intravenous tislelizumab, every three weeks. "This collaboration has progressed quickly, and we are pleased that we can investigate the potential complementary activity of sitravatinib and tislelizumab in patients with advanced solid tumors in China and Australia," said Amy Peterson, M.D., Chief Medical Officer, Immuno-Oncology at BeiGene. Under the terms of the collaboration agreement, upon initiation of the clinical trial by BeiGene, Mirati will receive a $3 million milestone payment.

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