Mirati Therapeutics Receives Approval from the MHRA for KRAZATI (adagrasib) as a Targeted Treatment Option for Patients with Advanced Non-Small Cell Lung Cancer (NSCLC) with a KRASG12C Mutation

SAN DIEGO and ZUG, Switzerland, Nov. 3, 2023 /PRNewswire/ — Mirati Therapeutics, Inc. (NASDAQ: MRTX), a commercial stage biotechnology company, today announced the United Kingdom’s Medicines and Healthcare Products Regulatory Agency (MHRA) granted conditional marketing authorization approval for KRAZATI® (adagrasib) as a monotherapy indicated for the treatment of adult patients with advanced non-small cell lung cancer (NSCLC) with KRAS^G12C mutation and have progressive disease after prior therapy with, or intolerance to, platinum-based chemotherapy and/or anti-PD-1/PD-L1 immunotherapy.

“KRAZATI offers a compelling therapeutic option for patients with previously treated locally advanced NSCLC with a KRAS^G12C mutation. MHRA’s authorization is a significant step towards improving the options available for patients and clinicians in Great Britain,” said Alan Sandler, M.D., chief medical officer, Mirati Therapeutics, Inc. “We are encouraged by the opportunity to bring KRAZATI, a potential best-in-class treatment to qualified patients.”

“Fourteen percent of people living with NSCLC harbour the KRAS^G12Cmutation yet there are limited targeted treatment options for patients with this devastating disease^1,2,” said Dr Shobhit Baijal (Consultant Medical Oncologist of The University Hospital Birmingham). “The expansion of treatment options for NSCLC benefits patients and clinicians alike. As someone intensively involved in the management of lung cancer patients, I look forward to KRAZATI being available for use in clinical practice.”

For more information, visit KRAZATI.com.

About KRAZATI (adagrasib)

Mirati has risen to meet one of the most challenging mutations in cancer research by developing KRAZATI, a highly selective and potent oral small-molecule inhibitor of KRAS^G12C.

Intentionally designed to meet the challenge of KRAS^G12C, adagrasib is optimized to sustain target inhibition, an attribute that could be important to treat KRAS^G12C-mutated cancers, as the KRAS^G12C protein regenerates every 24−48 hours.¹ Adagrasib has shown clinically to be a CNS penetrant, which may be important given that CNS metastases frequently occur in NSCLC and lead to poor prognosis^.2,3,4

KRAZATI (adagrasib) GB Indication

KRAZATI as monotherapy is indicated for the treatment of adult patients with advanced non-small cell lung cancer (NSCLC) with KRAS G12C mutation and have progressive disease after prior therapy with, or intolerance to, platinum-based chemotherapy and/or anti-PD-1/PD-L1 immunotherapy.

Important Safety Information

The full Summary of Product Characteristics (SPC/SmPC) for KRAZATI® (adagrasib) will be available on the MHRA website at https://products.mhra.gov.uk/.

About the KRYSTAL-1 Study

KRYSTAL-1 is an open-label Phase 1/2 multiple-expansion cohort trial evaluating adagrasib as monotherapy and in combination with other anti-cancer therapies in patients with advanced solid tumors harboring the KRAS^G12C mutation.

About KRAS^G12C in NSCLC

Lung cancer is one of the most common cancers worldwide, accounting for 2.21 million new cases and 1.8 million deaths worldwide in 2020.⁵ Lung cancer consists of NSCLC in approximately 85% of cases and small cell lung cancer (SCLC) in approximately 15% of cases.⁶ KRAS^G12C is the most common KRAS mutation in NSCLC, present in approximately 14% of patients with lung adenocarcinoma, and is a biomarker mutation of poor prognosis.¹^,³

About Mirati Therapeutics, Inc.

Mirati Therapeutics, Inc. is a commercial stage biotechnology company whose mission is to discover, design and deliver breakthrough therapies to transform the lives of patients with cancer and their loved ones. The company is relentlessly focused on bringing forward therapies that address areas of high unmet need, including lung cancer, and advancing a pipeline of novel therapeutics targeting the genetic and immunological drivers of cancer. Unified for patients, Mirati’s vision is to unlock the science behind the promise of a life beyond cancer.

For more information about Mirati, visit us at Mirati.com or follow us on Twitter, LinkedIn and Facebook.

Forward Looking Statements

This press release includes forward-looking statements regarding Mirati Therapeutic, Inc.’s (“Mirati”) business, the therapeutic and commercial potential of KRAZATI® (adagrasib), MRTX1719 (MTA-cooperative PRMT5 inhibitor), MRTX0902 (SOS1 inhibitor), and MRTX1133 (selective KRASG12D inhibitor), and Mirati’s technologies and other products in development. Any statement describing Mirati’s goals, expectations, intentions or beliefs, financial or other projections, is a forward-looking statement and should be considered an at-risk statement. Such statements are subject to certain risks and uncertainties, including those inherent in the process of discovering, developing and commercializing medicines that are safe and effective for use as human therapeutics, the endeavor of building a business around such medicines, and the proposed acquisition of Mirati by Bristol-Myers Squibb Company.

Mirati’s forward-looking statements also involve assumptions that, if they never materialize or prove correct, could cause its results to differ materially from those expressed or implied by such forward-looking statements. Although Mirati’s forward-looking statements reflect the good faith judgment of its management, these statements are based only on facts and factors currently known by Mirati. As a result, you are cautioned not to rely on these forward-looking statements. These and other risks concerning Mirati’s programs are described in additional detail in Mirati’s annual report on Form 10-K, and most recent Form 10-Q, which are on file with the Securities and Exchange Commission (the “SEC”) and available at the SEC’s website (www.sec.gov). These forward-looking statements are made as of the date of this press release, and Mirati assumes no obligation to update the forward-looking statements, or to update the reasons why actual results could differ from those projected in the forward-looking statements, except as required by law.

Mirati Contacts

Investor Relations: [email protected]

Media Relations: [email protected]

References

¹ Hallin J, Engstrom LD, Hargis L, et al. The KRAS^G12C Inhibitor MRTX849 Provides Insight toward Therapeutic Susceptibility of KRAS-Mutant Cancers in Mouse Models and Patients. Cancer Discov. 2020;10(1):54-71.

² Sabari JK, Velcheti V, Shimizu K, et al. Activity of Adagrasib (MRTX849) in Brain Metastases: Preclinical Models and Clinical Data from Patients with KRASG12C-Mutant Non-Small Cell Lung Cancer. Clin Cancer Res. 2022;28(15):3318-3328.

³ Cagney DN, Martin AM, Catalano PJ, et al. Incidence and prognosis of patients with brain metastases at diagnosis of systemic malignancy: a population-based study. Neuro Oncol. 2017;19(11):1511-1521.

⁴ Ali A, Goffin JR, Arnold A, Ellis PM. Survival of patients with non-small-cell lung cancer after a diagnosis of brain metastases. Curr Oncol. 2013;20(4):e300-6.

⁵ Lung cancer statistics. WCRF International. https://www.wcrf.org/cancer-trends/lung-cancer-statistics/. Published April 14, 2022.

⁶ Molina JR, Yang P, Cassivi SD, Schild SE, Adjei AA. Non-small cell lung cancer: epidemiology, risk factors, treatment, and survivorship. Mayo Clin Proc. 2008;83(5):584-94.