The instant invention provides a method for treating patients by administering a JAK inhibitor. The instant invention provides a method for treating patients by administering a JAK inhibitor wherein the JAK inhibitor is a JAK2 inhibitor. The instant invention provides a method for treating patients by administering a JAK inhibitor wherein the JAK inhibitor is selected from selected from Jak2-IA, AG490, Pyridone 6, WP1066, LS104, TG101209, TG101348, CP690,550, CP352,664, INCB18424, WHI-P154, CMP6, SB1518, XL019, CEP-701, INCB20, AUH-6-96 and AZ960.