AMG 510 is the First KRASG12C Inhibitor to Reach Clinical Stage After Three Decades of RAS Research

First-In-Human Results Show Preliminary Safety, Tolerability Data and Anti-Tumor Activity in KRAS Mutant Solid Tumors

FDA Grants AMG 510 Orphan Drug Designation for KRASG12C-Positive Non-Small Cell Lung and Colorectal Cancers

THOUSAND OAKS, CA, USA I June 3, 2019 I Amgen (NASDAQ: AMGN) today announced the first clinical results from a Phase 1 study evaluating investigational AMG 510, the first KRASG12C inhibitor to reach the clinical stage. In the trial, there were no dose-limiting toxicities at tested dose levels. AMG 510 showed anti-tumor activity when administered as a monotherapy in patients with locally-advanced or metastatic KRASG12C mutant solid tumors. These data are being presented during an oral session at the 55th Annual Meeting of the American Society of Clinical Oncology (ASCO) in Chicago.

"KRAS has been a target of active exploration in cancer research since it was identified as one of the first oncogenes more than 30 years ago, but it remained undruggable due to a lack of traditional small molecule binding pockets on the protein. AMG 510 seeks to crack the KRAS code by exploiting a previously hidden groove on the protein surface," said David M. Reese, M.D., executive vice president of Research and Development at Amgen. "By irreversibly binding to cysteine 12 on the mutated KRAS protein, AMG 510 is designed to lock it into an inactive state. With high selectivity for KRASG12C, we believe investigational AMG 510 has high potential as both a monotherapy and in combination with other targeted and immune therapies."

The Phase 1, first-in-human, open-label multicenter study enrolled 35 patients with various tumor types (14 non-small cell lung cancer [NSCLC], 19 colorectal cancer [CRC] and two other). Eligible patients were heavily pretreated with at least two or more prior lines of treatment, consistent with their tumor type and stage of disease. The primary endpoint is safety, and key secondary endpoints include pharmacokinetics, objective response rate (assessed every six weeks), duration of response and progression-free survival. Patients were enrolled in four dose cohorts - 180 mg, 360 mg, 720 mg and 960 mg, taken orally once a day.

Five out of 10 evaluable patients with NSCLC experienced a partial response (PR), and another four had stable disease (SD), for a disease control rate (DCR) of 90 percent (9/10).1 All five patients with response to therapy had a treatment duration of 7.3-27.4 weeks at data cutoff and remain active on treatment. One patient with PR improved further to a complete response of the target lesions at week 18, post data cutoff.

In addition, 13 of 18 evaluable patients with CRC achieved SD, with the majority of CRC patients treated at the first two dose levels. Twenty-six patients remain on study and nine have discontinued.

Treatment-related adverse events (AEs) were primarily grade 1 events (approximately 68 percent). Two grade 3 treatment-related AEs were reported (anemia and diarrhea). No grade 4 treatment-related AEs and no serious treatment-related AEs were reported. Enrollment into dose expansion is underway.

"While there's been significant progress in treating solid tumor cancers overall with targeted therapies, patients with the KRASG12C mutation have not benefited from these advances," said Marwan G. Fakih, M.D., clinical study investigator and co-director of the Gastrointestinal Cancer Program, City of Hope, Duarte, Calif. "In this early Phase 1 trial, investigational AMG 510 showed encouraging anti-tumor activity. We look forward to further investigating AMG 510 with the goal of closing the treatment gap for patients with this type of mutation."

Amgen Webcast Investor Meeting
Amgen will host a webcast investor meeting at ASCO 2019 on Monday, June 3 at 6:30 p.m. CT. David M. Reese, M.D., executive vice president of Research and Development at Amgen, along with members of Amgen's clinical development team and clinical investigators, will participate at the investor meeting to discuss Amgen's oncology program and data presented at ASCO 2019. Live audio of the conference call will be broadcast over the internet simultaneously and will be available to members of the news media, investors and the general public.

The webcast, as with other selected presentations regarding developments in Amgen's business given at certain investor and medical conferences, can be accessed on Amgen's website, www.amgen.com, under Investors. Information regarding presentation times, webcast availability and webcast links are noted on Amgen's Investor Relations Events Calendar. The webcast will be archived and available for replay for at least 90 days after the event.

About KRAS
The subject of more than three decades of research, the RAS gene family are the most frequently mutated oncogenes in human cancers.2,3 Within this family, KRAS is the most prevalent variant and is particularly common in solid tumors.3 A specific mutation known as KRASG12C accounts for approximately 13 percent of non-small cell lung cancers, three to five percent of colorectal cancers and one to two percent of numerous other solid tumors.4 Approximately 30,000 patients are diagnosed each year in the United States with KRASG12C driven cancers.5 Amgen is exploring the potential of KRASG12C inhibition across a broad variety of tumor types.

About Amgen Oncology
Amgen Oncology is searching for and finding answers to incredibly complex questions that will advance care and improve lives for cancer patients and their families. Our research drives us to understand the disease in the context of the patient's life – not just their cancer journey – so they can take control of their lives.

For the last four decades, we have been dedicated to discovering the firsts that matter in oncology and to finding ways to reduce the burden of cancer. Building on our heritage, Amgen continues to advance the largest pipeline in the Company's history, moving with great speed to advance those innovations for the patients who need them.

At Amgen, we are driven by our commitment to transform the lives of cancer patients and keep them at the center of everything we do.   

For more information, follow us on www.twitter.com/amgenoncology.

About Amgen
Amgen is committed to unlocking the potential of biology for patients suffering from serious illnesses by discovering, developing, manufacturing and delivering innovative human therapeutics. This approach begins by using tools like advanced human genetics to unravel the complexities of disease and understand the fundamentals of human biology.

Amgen focuses on areas of high unmet medical need and leverages its expertise to strive for solutions that improve health outcomes and dramatically improve people's lives. A biotechnology pioneer since 1980, Amgen has grown to be one of the world's leading independent biotechnology companies, has reached millions of patients around the world and is developing a pipeline of medicines with breakaway potential.

For more information, visit www.amgen.com and follow us on www.twitter.com/amgen.

References

  1. Eisenhauer EA, Therasse P, Bogaerts J, et al. New response evaluation criteria in solid tumours: Revised RECIST guideline (version 1.1). European Journal of Cancer. 2009;45:228-247.
  2. Cox A, et al. Drugging the undruggable RAS: Mission Possible? Nature Reviews Drug Discovery. 2014;13(11):828-851.
  3. Fernandez-Medarde A, Santos E. Ras in Cancer and Developmental Diseases. Genes Cancer. 2011;2(3):344-358.
  4. Lipford, JR. Pre-clinical development of AMG 510: the first inhibitor of KRASG12C in clinical testing. Oral presentation at AACR 2019; Atlanta, GA. March 29-April 3, 2019.
  5. Stephen AG, et al. Dragging Ras Back in the Ring. Cancer Cell. 2014;25:272-281. 

SOURCE: Amgen

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