Myelodysplastic syndromes staging

There is no staging system for myelodysplastic syndromes. Treatment is based on whether the disease developed after the patient was exposed to factors that cause myelodysplastic syndrome or the disease was previously treated. Myelodysplastic syndromes are grouped for treatment as follows:

  • De novo myelodysplastic syndromes develop without any known cause.
  • Secondary myelodysplastic syndromes develop after the patient was treated with chemotherapy or radiation therapy for other diseases or after being exposed to radiation or certain chemicals that are linked to the development of myelodysplastic syndromes. Secondary myelodysplastic syndromes may be harder to treat than de novo myelodysplastic syndromes.
  • Previously treated myelodysplastic syndromes.
  • The myelodysplastic syndrome has been treated but has not improved.