Saturday, January 25, 2020

The clinical KRAS(G12C) inhibitor AMG 510 drives anti-tumour immunity

Jude Canon, Karen Rex, Anne Y. Saiki, Christopher Mohr, Keegan Cooke, Dhanashri Bagal,
Kevin Gaida, Tyler Holt, Charles G. Knutson, Neelima Koppada, Brian A. Lanman, Jonathan
Werner, Aaron S. Rapaport, Tisha San Miguel, Roberto Ortiz, Tao Osgood, Ji-Rong Sun,
Xiaochun Zhu, John D. McCarter, Laurie P. Volak, Brett E. Houk, Marwan G. Fakih, Bert H.
O’Neil, Timothy J. Price, Gerald S. Falchook, Jayesh Desai, James Kuo, Ramaswamy Govindan, David S. Hong, Wenjun Ouyang, Haby Henary, Tara Arvedson, Victor J. Cee & J. Russell Lipford

Nature 575, 217–223 (2019).

KRAS is the most frequently mutated oncogene in cancer and encodes a key signalling protein in tumours. The KRAS(G12C) mutant has a cysteine residue that has been exploited to design covalent inhibitors that have promising preclinical activity. Here we optimized a series of inhibitors, using novel binding interactions to markedly enhance their potency and selectivity. Our efforts have led to the discovery of AMG 510, which is, to our knowledge, the first KRAS(G12C) inhibitor in clinical development. In preclinical analyses, treatment with AMG 510 led to the regression of KRASG12C tumours and improved the anti-tumour efficacy of chemotherapy and targeted agents. In immune-competent mice, treatment with AMG 510 resulted in a pro-inflammatory tumour microenvironment and produced durable cures alone as well as in combination with immune-checkpoint inhibitors. Cured mice rejected the growth of isogenic KRASG12D tumours, which suggests adaptive immunity against shared antigens. Furthermore, in clinical trials, AMG 510 demonstrated anti-tumour activity in the first dosing cohorts and represents a potentially transformative therapy for patients for whom effective treatments are lacking.

Chemical Specification of E3 Ubiquitin Ligase Engagement by Cysteine-Reactive Chemistry

Roman C. Sarott, Inchul You, Yen-Der Li, Sean T. Toenjes, Katherine A. Donovan, Pooreum Seo, Martha Ordonez, Woong Sub Byun, Muhammad Murtaz...