SOX17 and idiopathic pulmonary arterial hypertension: We have added seven new cases (four IPAH, one APAH-CTD, and two APAH-CHD), of which two of the IPAH patients showed the same variant, SOX17:NM_022454.4:c.499_520del:p.Leu167TrpfsTer213, previously reported in other patients in the literature.