Fractionated radiotherapy and radiosurgery in acromegaly: analysis of 352 patients from the German Acromegaly Registry.

Abstract:

Background:If biochemical control of acromegaly is not achieved by operation and medication, radiotherapy may be indicated. Objective:To describe fractionated radiotherapy (FRT) and stereotactic radiosurgery (SRS) regarding excess of IGF-1 and pituitary function. Design and methods:A retrospective analysis of 352 patients (4126 patient-years) from the German Acromegaly Registry was performed. Follow-up was 1.0-45.1 years after radiotherapy. Therapeutic success was defined by low or normal IGF-1 according to center-specific reference ranges without (= remission) or on (= controlled disease) suppressive medication. Results:Time between radiotherapy and last follow-up was 13.0 ± 8.2 years for FRT (n = 233) and 8.9 ± 5.0 years for SRS (n = 119, P < 0.001). Median (IQR) basal growth hormone before radiotherapy was 6.3 (2.9-16.2) ng/mL for FRT and 3.5 (1.8-6.9) ng/mL for SRS (P < 0.001). Mean time in uncontrolled state was 3.0 years after FRT and 2.1 years after SRS (95% CI for the difference is 0.1 to 1.6 years, P = 0.021). The 10-year calculated remission rate was 48% for FRT and 52% for SRS (95% CI for the difference is -18 to 26% age points, P = 0.74) and the respective controlled disease rate was 23 and 26%. The odds ratio for adrenocorticotropic or thyreotropic insufficiency was 0.54 (95% CI: 0.30-1.00, P = 0.049) in SRS compared to FRT patients. Conclusion:Both after FRT and SRS about 75% of patients with acromegaly are in remission or controlled after 10 years. A slightly faster achievement of target values was observed after SRS. The rate of pituitary insufficiency in FRT patients is significantly higher.

journal_name

Eur J Endocrinol

authors

Knappe UJ,Petroff D,Quinkler M,Schmid SM,Schöfl C,Schopohl J,Stieg MR,Tönjes A,participants of the German Acromegaly Registry.

doi

10.1530/EJE-19-0784

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

275-284

issue

3

eissn

0804-4643

issn

1479-683X

pii

EJE-19-0784

journal_volume

182

pub_type

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