[Focus on targeting the Ras-MAPK pathway: the Mek inhibitors]
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Updated: Apr 20, 2026

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
Published on: July 17, 2019
Capucine Baldini1, Boris Duchemann1, Antoine Hollebecque1
1Institut Gustave-Roussy, 114, rue Édouard-Vaillant, 94805 Villejuif, France.
Abstract:
The Ras/Raf/Mek/Erk pathway is a key component of tumor progression and modulates proliferation, survival, differentiation and angiogenesis. Hyperactivation of this pathway is highly implicated in tumorigenesis especially by gain of function mutation of Kras or Braf. Mek position at the end of the pathway seems to be a promising new therapeutic target in the Kras or Braf mutated cancers. In this review, we aimed at describing the Ras/Raf/Mek/Erk pathway, the new therapeutic approaches in solid tumors and their toxicities. However, there seems to be predictives factors of tumor responses to these new agents and mechanisms of resistance that we will tend to analyse.
Insights
Targeting the Ras/Raf/Mek/Erk pathway, crucial in cancer growth, offers new therapeutic options for Kras or Braf mutated solid tumors. This review analyzes these treatments, their toxicities, and resistance mechanisms.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Context:
- The Ras/Raf/Mek/Erk pathway is integral to tumor progression, influencing cell proliferation, survival, differentiation, and angiogenesis.
- Hyperactivation of this pathway, often due to Kras or Braf mutations, is a significant driver of tumorigenesis.
- Mek inhibitors represent a promising therapeutic strategy for cancers with activated Ras/Raf/Mek/Erk signaling.
Purpose:
- To review the Ras/Raf/Mek/Erk pathway's role in cancer.
- To describe emerging therapeutic strategies targeting this pathway in solid tumors.
- To analyze predictive factors for treatment response and mechanisms of resistance.
Summary:
- The Ras/Raf/Mek/Erk pathway is a critical regulator of cellular processes involved in cancer development.
- Gain-of-function mutations in Kras or Braf frequently lead to pathway hyperactivation, driving tumor growth.
- Mek inhibitors are emerging as targeted therapies for Kras or Braf-mutated cancers, with ongoing research into predictive biomarkers and resistance.
Impact:
- Provides a comprehensive overview of the Ras/Raf/Mek/Erk pathway in oncology.
- Highlights the therapeutic potential of Mek inhibitors in specific cancer types.
- Addresses key challenges in targeted cancer therapy, including response prediction and resistance.
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