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From Nelson's Syndrome to Corticotroph Tumor Progression Speed: An Update
Laura Bessiène1, Chiara Villa2,3, Xavier Bertagna1
1Department of Endocrinology and National Reference Center for Rare Adrenal Disorders, AP-HP, Hôpital Cochin, F-75014 Paris, France.
Summary
Nelson syndrome, a corticotroph pituitary tumor complication post-adrenalectomy, shows variable growth rates. Rapid progression suggests intrinsic tumor aggressiveness, necessitating monitoring for early detection and management.
Area of Science:
- Endocrinology
- Neurosurgery
- Oncology
Background:
- Nelson syndrome, a condition arising after bilateral adrenalectomy for pituitary tumors, has evolved in understanding over 60 years.
- Corticotroph pituitary neuroendocrine tumors (PitNETs) are now recognized as aggressive only in a subset of cases.
- Corticotroph tumor progression (CTP) affects 30-40% of patients post-adrenalectomy, with variable speeds (CTPS).
Purpose of the Study:
- To analyze the characteristics and clinical implications of corticotroph tumor progression speed (CTPS) in Nelson syndrome.
- To identify factors associated with rapid CTPS and related complications.
- To evaluate the role of hormonal monitoring and imaging in managing CTP.
Main Methods:
- Retrospective analysis of patients with Nelson syndrome following bilateral adrenalectomy.
- Measurement of corticotroph tumor progression speed (CTPS) using imaging metrics.
- Correlation of CTPS with clinical parameters, hormone levels (ACTH), and pathology (Ki67).
Main Results:
- CTPS varied significantly, from millimeters to 40 mm/year, with rapid progression linked to severe Cushing's disease and higher ACTH/Ki67.
- Complications like apoplexy and visual defects were associated with faster CTPS.
- Early morning ACTH levels and their variations effectively reflected CTPS; cortisol deprivation did not significantly increase CTPS.
Conclusions:
- Rapid CTPS in Nelson syndrome likely indicates inherent tumor aggressiveness.
- Molecular mechanisms underlying corticotroph PitNET aggressiveness require further investigation.
- Regular MRI and ACTH monitoring are crucial for early detection and management of fast-growing tumors.
