Mirati Therapeutics, Inc. (Nasdaq: MRTX) (the Company or Mirati), On 4/24/18 provided a progress update on its lead development programs and announced updated, positive clinical trial data for sitravatinib, a spectrum selective kinase inhibitor, and mocetinostat, a class I and IV HDAC inhibitor. The Company has been evaluating sitravatinib and mocetinostat in separate Phase 2 clinical trials in combination with checkpoint inhibitor therapy in non-small cell lung cancer (NSCLC) patients whose disease had progressed following prior treatment with a checkpoint inhibitor. Both clinical trials have generated encouraging preliminary data demonstrating the potential to overcome resistance to checkpoint inhibitor therapy.
"The majority of NSCLC patients either do not respond to checkpoint inhibitor therapy or experience disease progression following treatment. These patients have limited treatment options and generally experience poor outcomes in response to standard of care chemotherapy," said Charles M. Baum, M.D., Ph.D., President and Chief Executive Officer. "The preliminary data from our Phase 2 study of sitravatinib plus nivolumab continue to highlight the promise of this combination to overcome resistance to initial checkpoint inhibitor therapy and provide a meaningful treatment option for this large and underserved patient population."
Sitravatinib is being evaluated in a Phase 2 study in combination with nivolumab (Opdivo), an anti-PD-1 checkpoint inhibitor, in patients with NSCLC who have experienced documented disease progression following prior treatment with a checkpoint inhibitor. As of the data cutoff date of March 31, 2018:
In a separate Phase 2 study, mocetinostat is being evaluated in combination with durvalumab (IMFINZI®), an anti-PD-L1 checkpoint inhibitor, in patients with NSCLC who have experienced documented disease progression following prior treatment with a checkpoint inhibitor. As of the data cutoff date of March 31, 2018:
MRTX849 is an orally-available small molecule that potently and selectively inhibits a form of KRAS which harbors a substitution mutation (G12C). KRAS G12C mutations are present in approximately 14% of NSCLC adenocarcinoma patients and 5% of colorectal cancer patients. Tumors characterized by KRAS G12C mutations are commonly associated with poor prognosis and resistance to therapy, and patients with these mutations have few treatment options. MTRX849 has demonstrated complete regression of KRAS G12C-positive human tumors implanted in mice. IND-enabling preclinical studies are underway, and an IND submission is expected in the fourth quarter of 2018, with early clinical proof-of-concept anticipated in 2019.