Overexpression and amplification of AXL receptor tyrosine kinase (RTK) has been found in several hematologic and solid malignancies. Activation of AXL by its ligand GAS6 can enhance tumor-promoting processes such as proliferation, migration, invasion, and survival. Despite the important role of AXL in cancer development, a deep and quantitative mapping of its signaling transduction has not been performed. Here, we used a mass spectrometry-based quantitative proteomic approach to characterize the temporal dynamics of the phosphotyrosine proteome of MDA-MB-231 cells stimulated with GAS6