Tyrosine-protein kinase receptor UFO is a protein that in human is encoded by the AXLgene.[5][6] The gene was initially designated as UFO, in allusion to the unidentified function of this protein.[7] However, in the years since its discovery, research into AXL's expression profile and mechanism has made it an increasingly attractive target, especially for cancer therapeutics. In recent years, AXL has emerged as a key facilitator of immune escape and drug-resistance by cancer cells, leading to aggressive and metastatic cancers.[8]
AXL is a cell surface receptor tyrosine kinase, part of the TAM family of kinases including TYRO3 and MERTK.[9]
^Janssen JW, Schulz AS, Steenvoorden AC, Schmidberger M, Strehl S, Ambros PF, et al. (1991). "A novel putative tyrosine kinase receptor with oncogenic potential". Oncogene. 6 (11): 2113–20. PMID1834974.
^Davidsen KT, Haaland GS, Lie MK, Lorens JB, Engelsen AS (2017). "The Role of Axl Receptor Tyrosine Kinase in Tumor Cell Plasticity and Therapy Resistance". In Akslen L, Watnick R (eds.). Biomarkers of the Tumor Microenvironment. Cham: Springer. pp. 351–376. ISBN978-3-319-39147-2.