How Do EGFR Point Mutations Drive Aberrant Signaling?
In a healthy state, cell growth, division, and death are precisely regulated. However, when key regulatory pathways malfunction, cells may escape this "command system," proliferating continuously and evading immune clearance, ultimately leading to disease—particularly tumors. As one of the world's leading malignancies, lung cancer has a complex pathogenesis rooted in the imbalance of cell growth regulatory systems. These imbalances are often genetic. For instance, EGFR point mutations allow the EGFR protein to activate automatically without the need for external ligand stimulation, magnifying downstream signals and leading to uncontrolled cell proliferation. EGFR is a receptor tyrosine kinase located on the cell membrane that regulates cell proliferation, differentiation, and survival across various tissues. Under normal conditions, when growth factors bind to EGFR, it triggers receptor dimerization and activates its kinase activity. This initiates a series of...