Mount Sinai researchers identify new therapeutic target for cancer

New research from The Tisch Cancer Institute at the Icahn School of Medicine at Mount Sinai identifies a protein that may be an unexplored target to develop new cancer therapies. The protein, known as kinase suppressor of Ras, or KSR, is a pseudoenzyme that plays a critical role in the transmission of signals in the cell determining whether cells grow, divide, or die. The findings, published in the September issue of the journal Nature, show that targeting KSR could have important therapeutic implications, potentially improving outcomes in many aggressing cancers such as lung and pancreatic cancer.

Ras is the most frequently mutated human cancer gene (oncogene), yet despite recent breakthroughs, therapeutic options to target Ras-dependent cancers remain limited. Previous studies had supported the possibility of targeting oncogenic forms of Ras via KSR, but no pharmacological approaches had been reported until now.

"New drug targets for Ras-dependent cancers have long been sought," said Arvin Dar, PhD, Assistant Professor of Oncological Sciences and Pharmacological Sciences at The Tisch Cancer Institute at the Icahn School of Medicine at Mount Sinai and lead researcher on the study. "We used data on known genetic variants in KSR that suppress mutant Ras signaling to guide the development of novel compounds. In this way our study took a very different approach as we have used chemistry to mimic genetic mechanisms that are able to block the development of Ras-dependent cancers."

The lead compound reported in the study, APS-2-79, was shown to modulate Ras signaling and increased the potency of several other cancer drugs within RAS-mutant cell lines. "KSR belongs to a large class of proteins that are not only implicated in the development of cancer, but also other diseases as well," Dr. Dar explained. "No one has really figured out how to exploit these important drug targets. Our study opens the possibility of modulating KSR as a new cancer therapy and also potentially an entirely new class of interventions."


The co-first authors of the paper are Neil Dhawan and Alex Scopton, graduate student and postdoctoral fellow, respectively, in the Dar laboratory. The work was supported by grants from the National Institutes of Health, the Damon Runyon-Rachleff Foundation, the Pew-Stewart Foundation, and the Pershing Square Sohn Cancer Research Alliance.

About the Mount Sinai Health System

The Mount Sinai Health System is an integrated health system committed to providing distinguished care, conducting transformative research, and advancing biomedical education. Structured around seven hospital campuses and a single medical school, the Health System has an extensive ambulatory network and a range of inpatient and outpatient services–from community-based facilities to tertiary and quaternary care.

The System includes approximately 7,100 primary and specialty care physicians; 12 joint-venture ambulatory surgery centers; more than 140 ambulatory practices throughout the five boroughs of New York City, Westchester, Long Island, and Florida; and 31 affiliated community health centers. Physicians are affiliated with the renowned Icahn School of Medicine at Mount Sinai, which is ranked among the highest in the nation in National Institutes of Health funding per investigator. The Mount Sinai Hospital is on the "Honor Roll" of best hospitals in America, ranked No. 15 nationally in the 2016-2017 "Best Hospitals" issue of U.S. News & World Report. The Mount Sinai Hospital is also ranked as one of the nation's top 20 hospitals in Geriatrics, Gastroenterology/GI Surgery, Cardiology/Heart Surgery, Diabetes/Endocrinology, Nephrology, Neurology/Neurosurgery, and Ear, Nose & Throat, and is in the top 50 in four other specialties. New York Eye and Ear Infirmary of Mount Sinai is ranked No. 10 nationally for Ophthalmology, while Mount Sinai Beth Israel, Mount Sinai St. Luke's, and Mount Sinai West are ranked regionally. Mount Sinai's Kravis Children's Hospital is ranked in seven out of ten pediatric specialties by U.S. News & World Report in "Best Children's Hospitals."

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