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KRAS (Kirsten rat sarcoma virus) is a key member of the Ras protein family, belonging to the class of small GTPases that play a pivotal role in cellular signal transduction. It regulates cellular proliferation, differentiation, and survival by modulating pathways such as MAPK and PI3K. Mutations in the KRAS gene represent one of the most prevalent driver events in human tumours, occurring with high frequency particularly in pancreatic cancer, colorectal cancer, and non-small cell lung cancer. These mutations frequently result in the persistent activation of KRAS, triggering abnormal signalling pathways and promoting both tumour development and the emergence of drug resistance.
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