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Abstract  Ras has been found to be mutated in 30% of non‐small cell lung cancers, and its mutation has been regarded as a causal factor underlying tumorigenesis. However, no successful medicine has been developed so far to inhibit Ras for lung cancer treatment. We have previously identified DHX33 as a Ras downstream effector, promoting cell cycle progression and cell growth. In this study, with the K‐Ras (G12D);DHX33 (lox/lox) mouse model, we discovered that genetic ablation of DHX33 inhibited tumor development. We further found that ablation of DHX33 altered the expression of nearly 2000 genes which are critical in cancer development such as cell cycle, apoptosis, glycolysis, Wnt signaling, and cell migration. Our study for the first time demonstrates the pivotal role of the DHX33 in Ras‐driven lung cancer development in vivo and highlights that pharmacological targeting DHX33 can be a feasible option in treating Ras‐mutant lung cancers.

Targeting RNA helicase DHX33 blocks Ras‐driven lung tumorigenesis in vivo