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Early effects of cranial irradiation on hypothalamic-pituitary function
The Journal of Clinical Endocrinology and Metabolism
|March 1, 1987
Summary
Cranial radiotherapy for nasopharyngeal carcinoma progressively impairs hypothalamic-pituitary function, affecting growth hormone and gonadotropin release. This dysfunction is evident one year post-treatment, indicating long-term endocrine risks for patients.
Area of Science:
- Endocrinology
- Oncology
- Radiation Oncology
Background:
- Nasopharyngeal carcinoma treatment often involves cranial radiotherapy.
- Radiotherapy can potentially damage the hypothalamic-pituitary axis.
- Understanding the long-term endocrine consequences is crucial for patient management.
Purpose of the Study:
- To evaluate hypothalamic-pituitary function before and after cranial radiotherapy in nasopharyngeal carcinoma patients.
- To assess the temporal progression of endocrine dysfunction following treatment.
Main Methods:
- Prospective study of 31 patients with nasopharyngeal carcinoma.
- Measurement of pituitary hormones (GH, FSH, LH, TSH, ACTH, prolactin, testosterone, T4, cortisol) before and at 1 and 2 years after radiotherapy.
- Hormonal response testing (insulin tolerance test, LHRH, TRH) was performed.
Main Results:
- Significant decrease in integrated GH response to hypoglycemia one year post-radiotherapy.
- Discordant changes in FSH and LH secretion in males, suggesting altered LHRH pulsatility.
- Delayed TSH response to TRH and decreased T4 and cortisol levels at two years.
- Hyperprolactinemia in women and development of hypopituitarism in some patients.
Conclusions:
- Cranial radiotherapy causes progressive hypothalamic-pituitary dysfunction.
- Endocrine impairment can be detected as early as one year after treatment.
- Long-term monitoring for hypopituitarism is essential in patients treated with cranial radiotherapy.