in 14 patients ( 35 % ) , pmf was preceded by another myeloproliferative disorder ( polycythemia rubra vera , essential thrombocythemia or unclassified myeloproliferative disorder ) , while 26 patients ( 65 % ) represented agnogenic myeloid metaplasia ( amm ) .
C0027022
myeloproliferative disorder
C0001815
agnogenic