An assessment of iron overload in children treated for cancer and nonmalignant hematologic disorders

Area of Science:

• Pediatric Hematology
• Transfusion Medicine
• Medical Imaging

Background:

• Children undergoing cancer or nonmalignant disorder treatments often require packed red blood cell (PRBC) transfusions.
• PRBC transfusions can lead to iron overload (IO), a condition requiring careful monitoring.
• Treatment intensity varies, potentially influencing transfusion burden and subsequent IO.

Purpose of the Study:

• To evaluate the natural course of iron overload in pediatric patients post-transfusion.
• To correlate iron overload progression with treatment intensity levels.
• To assess the efficacy of monitoring iron levels using serum ferritin and MRI.

Main Methods:

• A cohort of 66 children was followed from 2010 to 2013.
• Patients were categorized into three treatment intensity groups using the Intensity of Treatment Rating Scale 3.0 (ITR-3).
• Iron overload was monitored via serial serum ferritin (SF) measurements and magnetic resonance imaging (MRI) of liver and spleen iron levels.

Main Results:

• Higher treatment intensity (level 4) correlated with significantly higher PRBC transfusion volumes.
• 21-29% of patients showed elevated SF levels (>1,000 μg/l) one year post-transfusion, with the slowest SF decrease in the level 4 group.
• MRI revealed significant improvements in liver and spleen relaxation times, indicating reduced iron deposition over time.

Conclusions:

• Iron overload naturally decreases after cessation of PRBC transfusions in children.
• Patients receiving the most intensive treatment (level 4) experienced a slower reduction in iron levels.
• Iron overload persisted for years in some high-intensity treatment patients, underscoring the need for long-term monitoring.