AXL and chronic myelogenous leukemia, BCR-ABL1 positive: The AXL receptor tyrosine kinase (AXL), also known as ARK, UFO, JTK11, Tyro7, belongs to the family of receptor tyrosine kinases (RTKs) and this gene AXL was first cloned from human chronic myelogenous leukemia (CML) cells, located at chromosome 19q13.2, encoding a 140 KDa protein with transforming ability [5, 6].