One such fusion protein, YAP-TFE3, occurs in 10 to 20% of epithelioid hemangioendotheliomas (41), a vascular tumor that is caused by fusion of the N terminus of either YAP or TAZ with TFE3 or CAMTA1, respectively (40). Here, YAP1 is linked to epithelioid hemangioendothelioma.