AIM: To investigate the expression of PTEN,VEGF and COX-2,and the relationship with angiogenesis in the bone tissues of JAK2 V617 F mutation positive myeloroliferative neoplasm( MPN) patients. METHODS:JAK2 V617 F positive MPN patients( n = 42) were selected in the First Hospital of Baoding including 25 cases of newly diagnosed group and 17 cases of treatment group with IFN-α 2b,and 10 cases of idiopathic thrombocytopenic purpura( ITP)patients served as controls. The ratio of mutant and wild type JAK2 was de...