Radiation therapy for chloroma (granulocytic sarcoma)

Area of Science:

• Hematology
• Oncology
• Radiation Oncology

Background:

• Chloroma, also known as granulocytic sarcoma, is a rare extramedullary tumor of immature myeloid cells.
• It is associated with acute nonlymphocytic leukemia or myelodysplastic syndrome.
• Modern studies on radiation therapy (RT) for chloroma are limited.

Purpose of the Study:

• To analyze treatment response, disease control, and toxicity of RT for chloromas.
• To develop treatment algorithm recommendations for patients with chloroma.

Main Methods:

• Retrospective review of 38 patients treated for chloromas between February 1990 and June 2010.
• Analysis of treatment outcomes, including local control, survival, and toxicity.

Main Results:

• RT was primarily used for relapsed or persistent chloromas after chemotherapy (90%).
• RT demonstrated excellent local control (39% progression-free survival at 5 years) and palliation (95% symptom relief).
• RT was well tolerated with no significant acute or late toxicity.

Conclusions:

• RT is effective for managing chloromas, particularly in cases of extramedullary progression or relapse.
• Recommended RT dose is at least 20 Gy, with 24 Gy in 12 fractions proposed as an appropriate regimen.
• RT provides excellent local disease control and symptom palliation with minimal toxicity.