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Journal Article
Review
The ERK cascade inhibitors: Towards overcoming resistance.
Drug Resistance Updates : Reviews and Commentaries in Antimicrobial and Anticancer Chemotherapy 2016 March
The RAS-ERK pathway plays a major regulatory role in various cellular processes. This pathway is hyperactivated and takes an active part in the malignant transformation of more than 85% of cancers. The hyperactivation is mainly due to oncogenic activating mutations in the pathway's components RAS, RAF and MEK, but also due to indirect mechanisms in cells transformed by other oncogenes. Various inhibitors targeting the different tiers of the cascade have been successfully developed and clinically approved, while some are still undergoing preclinical and clinical evaluation. Treatments with the clinically approved RAF and MEK inhibitors have substantially improved the clinical outcome of metastatic mutated-BRAF melanoma. However, the rapid emergence of drug resistance of initially responsive cancers and limited efficacy towards other cancers has led to only marginal patient benefit. Deciphering the molecular mechanisms underlying intrinsic or acquired resistance is a necessity in order to enhance the treatment efficacy of ERK-addicted cancers. Therefore, many studies in the past 5 years embarked on this campaign, revealing several resistance mechanisms. These include, expression of drug-resistant RAF isoforms, molecular or genetic alterations of active downstream components, overexpression of upstream components of the cascade that can reactivate ERK and other survival-related pathways. The understanding of these molecular resistance mechanisms led to further development of drugs that can overcome drug resistance, including our own effort aiming to prevent the nuclear translocation of ERK without affecting its activation. In this review we will focus on the mechanisms underlying drug resistance and efforts to develop activity-independent, more efficacious, antitumor drugs.
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