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Second thyroid neoplasms after prophylactic cranial irradiation for acute lymphoblastic leukemia
Y Perel1, G Leverger, A Carrere
1Department of Pediatrics, Children's Hospital, Groupe Hospitalier Pellegrin, Bordeaux, France. yves.perel@chu-aquitaine.fr
American Journal of Hematology
|September 2, 1998
Summary
Cranial radiation for childhood acute lymphoblastic leukemia (ALL) may increase thyroid cancer risk due to scattered radiation, especially in young children. Long-term thyroid monitoring is crucial, and alternative treatments should be considered.
Area of Science:
- Pediatric Oncology
- Radiation Oncology
- Cancer Pathogenesis
Background:
- Acute lymphoblastic leukemia (ALL) is a common childhood cancer.
- Cranial irradiation is a standard prophylactic treatment for ALL.
- Understanding the long-term effects of radiation is crucial for patient care.
Observation:
- Two children treated with cranial irradiation (18 Gy) for ALL developed thyroid carcinoma (TC) 12 and 13 years later.
- Literature review indicates a link between TC after ALL and radiation-induced cancers.
- Scattered radiation from cranial irradiation is implicated as the cause.
Findings:
- The risk of radiation-induced thyroid carcinoma is highest in young children.
- Late effects of scattered radiation are a likely cause of TC in these patients.
- Continuous, indefinite clinical monitoring of the thyroid and cervical area for nodules is recommended post-irradiation.
Implications:
- Alternative neuromeningeal prophylaxis methods should be explored for young children with ALL.
- This research highlights the need for risk-benefit analysis in pediatric cancer treatment protocols.
- Long-term surveillance strategies for survivors of childhood ALL treated with cranial radiation require re-evaluation.