Myelodysplastic SyndromesChromosomes, Human, Pair 5ThalidomideAzacitidineAnemia, RefractoryAnemia, Refractory, with Excess of BlastsSyndromeLeukemia, Myelomonocytic, ChronicLeukemia, Myeloid, AcuteLeukemia, MyeloidAnemia, SideroblasticBone MarrowChromosome AberrationsKaryotypingMonosomyPreleukemiaMyeloproliferative DisordersMyelodysplastic-Myeloproliferative DiseasesPancytopeniaAnemia, AplasticChromosomes, Human, Pair 7Cytogenetic AnalysisPrognosisBone Marrow CellsLeukemiaAcute DiseaseChromosome DeletionGranulocyte Precursor CellsTreatment OutcomeNeoplasms, Second PrimaryBone Marrow DiseasesHematopoietic Stem Cell TransplantationIron OverloadTrisomyAntimetabolites, AntineoplasticCytogeneticsErythrocyte TransfusionHematologic AgentsTransplantation, HomologousHematopoietic Stem CellsChelation TherapySurvival Analysis