K-Ras is a gene that provides instructions for making a protein involved in cell signaling pathways. This protein helps regulate cell growth, division, and survival. Mutations in the K-Ras gene can lead to uncontrolled cell proliferation, contributing to the development of various cancers, particularly pancreatic cancer, colorectal cancer, and lung cancer. The K-Ras protein is part of a larger family of proteins known as Ras proteins, which play a crucial role in transmitting signals from outside the cell to the cell's interior. Understanding K-Ras and its mutations is essential for developing targeted therapies in cancer treatment.