LMTK3 and neoplasm: Functional experiments were conducted <i>in vitro</i> to verify the biological effects of the key gene <i>LMTK3</i> on PTC cell proliferation, viability, and invasion.<h4>Results</h4>Nineteen LDCDRG were differentially expressed between normal and tumor tissues, defining three molecular subtypes with distinct immune and prognostic profiles.