Polycythemia VeraPolycythemiaThrombocythemia, EssentialJanus Kinase 2Myeloproliferative DisordersPrimary MyelofibrosisThrombocytosisErythropoietinPipobromanErythroid Precursor CellsPhlebotomyErythropoiesisReceptors, ErythropoietinReceptors, ThrombopoietinHematocritBloodlettingVon Hippel-Lindau Tumor Suppressor ProteinPancreatic NeoplasmsHematopoiesis, ExtramedullaryNeoplasmsGranulocytesNeoplasms, Cystic, Mucinous, and SerousSomatostatinomaMutationErythrocyte VolumeRussiaHomozygoteThrombosisMutation, MissenseHydroxyureaGPI-Linked ProteinsSkin NeoplasmsAmino Acid SubstitutionNeoplasms, Multiple PrimaryIsoantigensBone Marrow NeoplasmsCyanosisParagangliomaErythroid CellsPlatelet CountBone MarrowColony-Forming Units AssayKidney NeoplasmsMegakaryocytesNeoplasms, Second PrimaryHeterozygoteLeukocytosisErythrocyte IndicesBudd-Chiari SyndromeErythrocyte CountAdenocarcinoma, MucinousThyroid NeoplasmsLeukemia, Myeloid, Chronic, Atypical, BCR-ABL NegativeHematopoietic Stem CellsHemoglobinsSplenomegalyPoint MutationAltitude SicknessHematologyNeoplasm ProteinsDNA Mutational AnalysisSTAT5 Transcription FactorDNA, NeoplasmChromosomes, Human, 19-20ThrombopoietinLung NeoplasmsParotid Neoplasms