Is myelodysplastic syndrome a malignant tumor?

Myelodysplastic syndromes (MDS) are generally not classified as cancer; rather, they constitute a group of hematologic disorders characterized by dysplasia across multiple blood cell lineages, leading to impaired hematopoiesis. This may result in symptoms such as anemia or thrombocytopenia. As the disease progresses, MDS can transform into acute leukemia, posing significant risks to overall health.