Lemur tyrosine kinase 3 (LMTK3; also known as LMR3, TYKLM3, KIAA1883) is a predicted dual-specificity protein kinase whose expression levels has been implicated in cancer cell invasion, endocrine resistance, poor prognosis and overall tumor progression in different types of malignancies [1–15]. The gene discussed is LMTK3; the disease is cancer.