Cluster 1331: wbc white blood cell count mm mcl days hydroxyurea registration 
Cluster 1582: white cells wbc blood mcl days ml ul wbcs administration 
Cluster 1737: white blood count cell mm ul hydroxyurea cells mcl meet 
Cluster 2090: mcl platelet count cells thrombocytosis pi days transfused marrow mm 
Cluster 2292: blast count hydroxyurea peripheral circulating blood marrow counts ul mm