An article in the September issue was published with an incorrect title (Stój A, Rudzki Z, Stachura J, et al. The JAK2 V617F mutation in Philadelphia-negative chronic myeloproliferative disorders. J Clin Pathol 2007;60:1070–1). The correct title should be: The JAK2 V617F mutation is frequently present in buccal swabs from patients suffering from Philadelphia-negative chronic myeloproliferative disorders, who carry the mutation detected in bone marrow or peripheral blood cells.