Similarly, levels of AITD-related antibodies, particularly anti-TPO, have been reported to be significantly elevated in PV patients when compared with controls in ethnically diverse populations in Argentina (9), Iran (3, 23), and Turkey (6), with anti-TPO levels ranging from 16 to 40% in the patient population compared with only 6–12% in the healthy control population. Here, TPO is linked to acquired polycythemia vera.