Refractory Anemia with Excess Blasts Type 1, also known as refractory anemia with excess blasts i, is related to myelodysplastic syndrome and hemosiderosis. An important gene associated with Refractory Anemia with Excess Blasts Type 1 is TET2 (Tet Methylcytosine Dioxygenase 2). The drugs Fludarabine and Lenograstim have been mentioned in the context of this disorder. Affiliated tissues include bone marrow and bone.