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A myelodysplastic syndrome characterized by an anemia in which 15% or more of the erythroid precursors are ringed sideroblasts. The ringed sideroblast is an erythroid precursor in which one third or more of the nucleus is encircled by granules which are positive for iron stain. It occurs primarily in older individuals. The median survival exceeds 5 years. (WHO, 2001) Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C4036\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C4036\' NCI Thesaurus)
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