AXL and sarcomatoid mesothelioma: TCGA profiles showed that AXL was more highly expressed in biphasic mesothelioma and sarcomatoid mesothelioma than in epithelioid mesothelioma and diffuse malignant mesothelioma (Figure S1B), which is also consistent with our previous immunoblotting findings that AXL expression is strongest in mesothelioma containing spindle-cell components [11].