PTK2 and endometriosis: Very recently, two non-receptor proteins tyrosine kinase, belonging to the Focal adhesion kinase (FAK) family, namely FAK and Proline-rich tyrosine kinase 2 (Pyk2), have been identified as new key players in mediating the inflammatory response involved in the pathogenesis of endometriosis (8), atherosclerosis (9) and asthma (10) as well as in tumorigenesis and metastasis formation (11, 12).