Radiation-induced hypopituitarism

Area of Science:

• Endocrinology
• Oncology
• Radiation Oncology

Background:

• Hypothalamic-pituitary (h-p) axis dysfunction is a common complication in cancer survivors treated with cranial radiotherapy.
• Pituitary tumors treated with radiotherapy also carry a risk of h-p axis damage.

Purpose of the Study:

• To review the controversy surrounding the site and pathophysiology of radiation damage to the h-p axis.
• To provide an epidemiological perspective on the frequency and pattern of radiation-induced hypopituitarism.

Main Methods:

• Review of existing literature on radiation-induced hypopituitarism.
• Analysis of epidemiological data on h-p axis dysfunction following radiotherapy.

Main Results:

• Recent evidence suggests cranial radiation causes direct pituitary damage, challenging older beliefs of predominant hypothalamic damage.
• Sparing the hypothalamus in stereotactic radiotherapy for pituitary tumors does not eliminate the long-term risk of hypopituitarism.

Conclusions:

• Radiation-induced h-p axis dysfunction affects up to 80% of patients long-term, with significant impacts on physical and psychological health.
• Understanding the pathophysiology and epidemiology is vital for effective long-term surveillance and timely hormone replacement therapy.