CC BY-NC-ND 4.0 · Journal of Diabetes and Endocrine Practice 2022; 05(03): 092-103
DOI: 10.1055/s-0042-1760392
Review Article

Contemporary Management of Acromegaly: A Practical Approach

1   Obesity, Endocrine and Metabolism Center, King Fahad Medical City, Riyadh, Saudi Arabia
,
1   Obesity, Endocrine and Metabolism Center, King Fahad Medical City, Riyadh, Saudi Arabia
,
1   Obesity, Endocrine and Metabolism Center, King Fahad Medical City, Riyadh, Saudi Arabia
,
Wael M. Almistehi
1   Obesity, Endocrine and Metabolism Center, King Fahad Medical City, Riyadh, Saudi Arabia
,
2   Department of Medicine, Endocrinology and Diabetes Unit, College of Medicine and King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
,
Mohammed J. Asha
3   Division of Neurosurgery, Department of Surgery, Tawam Hospital, United Arab Emirates
,
4   Department of Medicine, Tawam Hospital, Al Ain, United Arab Emirates
5   Department of Medicine, UAE University, United Arab Emirates
› Author Affiliations
Sponsorship and Funding The study received no sponsorship or funding.

Abstract

Acromegaly is a rare, chronic disease that is, in more than 95% of cases, caused by a growth hormone (GH)-secreting pituitary adenoma. Overproduction of insulin-like growth factor-1 (IGF-1) due to GH hypersecretion leads to various clinical features characterized by somatic overgrowth, physical changes, multiple comorbidities, and increased mortality. The average age at diagnosis is 40 to 50 years, with no sex predilection. The mean delay in diagnosis is 4.5 to 5 years due to the insidious onset and slow clinical progression of the disease. The diagnosis is confirmed by increased levels of IGF-1 and insuppressible GH measured by an oral glucose tolerance test. Treatment is aimed at normalizing GH/IGF-1 levels and controlling tumor volume. Medical treatment and radiotherapy can be utilized when surgery fails to control GH/IGF-1 hypersecretion. This article aims to review recent updates in acromegaly diagnosis and treatment to raise awareness about acromegaly clinical presentation and management.

Authors' Contributions

The authors were assigned specific sections to draft, which were developed into a single manuscript reviewed and approved by all authors.


Compliance with Ethical Principles

Not applicable.




Publication History

Article published online:
23 January 2023

© 2023. Gulf Association of Endocrinology and Diabetes (GAED). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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  • References

  • 1 Melmed S. Acromegaly pathogenesis and treatment. J Clin Invest 2009; 119 (11) 3189-3202
  • 2 Giustina A, Barkan A, Beckers A. et al. A consensus on the diagnosis and treatment of acromegaly comorbidities: an update. J Clin Endocrinol Metab 2020; 105 (04) dgz096 DOI: 10.1210/clinem/dgz096.
  • 3 Gadelha MR, Kasuki L, Lim DST, Fleseriu M. Systemic complications of acromegaly and the impact of the current treatment landscape: an update. Endocr Rev 2019; 40 (01) 268-332
  • 4 Ershadinia N, Tritos NA. Diagnosis and treatment of acromegaly: an update. Mayo Clin Proc 2022; 97 (02) 333-346
  • 5 Melmed S. Medical progress: acromegaly. N Engl J Med 2006; 355 (24) 2558-2573
  • 6 Starnoni D, Daniel RT, Marino L, Pitteloud N, Levivier M, Messerer M. Surgical treatment of acromegaly according to the 2010 remission criteria: systematic review and meta-analysis. Acta Neurochir (Wien) 2016; 158 (11) 2109-2121
  • 7 Bush ZM, Vance ML. Management of acromegaly: is there a role for primary medical therapy?. Rev Endocr Metab Disord 2008; 9 (01) 83-94
  • 8 Lavrentaki A, Paluzzi A, Wass JAH, Karavitaki N. Epidemiology of acromegaly: review of population studies. Pituitary 2017; 20 (01) 4-9
  • 9 Colao A, Grasso LFS, Giustina A. et al. Acromegaly. Nat Rev Dis Primers 2019; 5 (01) 20 DOI: 10.1038/s41572-019-0071-6.
  • 10 Gruppetta M, Mercieca C, Vassallo J. Prevalence and incidence of pituitary adenomas: a population based study in Malta. Pituitary 2013; 16 (04) 545-553
  • 11 Agustsson TT, Baldvinsdottir T, Jonasson JG. et al. The epidemiology of pituitary adenomas in Iceland, 1955-2012: a nationwide population-based study. Eur J Endocrinol 2015; 173 (05) 655-664
  • 12 Giustina A, Mancini T, Boscani PF. et al; COM.E.T.A. (COMorbidities Evaluation and Treatment inAcromegaly) Italian Study Group. Assessment of the awareness and management of cardiovascular complications of acromegaly in Italy. The COM.E.T.A. (COMorbidities Evaluation and Treatment in Acromegaly) Study. J Endocrinol Invest 2008; 31 (08) 731-738
  • 13 Giustina A, Barkan A, Casanueva FF. et al. Criteria for cure of acromegaly: a consensus statement. J Clin Endocrinol Metab 2000; 85 (02) 526-529
  • 14 Ambrosio MR, Gagliardi I, Chiloiro S. et al. Acromegaly in the elderly patients. Endocrine 2020; 68 (01) 16-31
  • 15 Bex M, Abs R, T'Sjoen G. et al. AcroBel–the Belgian registry on acromegaly: a survey of the 'real-life' outcome in 418 acromegalic subjects. Eur J Endocrinol 2007; 157 (04) 399-409
  • 16 Raappana A, Koivukangas J, Ebeling T, Pirilä T. Incidence of pituitary adenomas in Northern Finland in 1992-2007. J Clin Endocrinol Metab 2010; 95 (09) 4268-4275
  • 17 Lenders NF, McCormack AI, Ho KKY. Management of endocrine disease: does gender matter in the management of acromegaly?. Eur J Endocrinol 2020; 182 (05) R67-R82
  • 18 Holdaway IM, Rajasoorya C. Epidemiology of acromegaly. Pituitary 1999; 2 (01) 29-41
  • 19 Ghazi AA, Amirbaigloo A, Dezfooli AA. et al. Ectopic acromegaly due to growth hormone releasing hormone. Endocrine 2013; 43 (02) 293-302
  • 20 Carroll PV, Joshi MN. Acromegaly. 2022 Sep 7. Endotext [Internet]. South Dartmouth (MA): MDText.com, Inc.; 2000–. PMID: 25905322
  • 21 Clemmons DR. Role of IGF-binding proteins in regulating IGF responses to changes in metabolism. J Mol Endocrinol 2018; 61 (01) T139-T169
  • 22 Landis CA, Masters SB, Spada A, Pace AM, Bourne HR, Vallar L. GTPase inhibiting mutations activate the α chain of Gs and stimulate adenylyl cyclase in human pituitary tumours. Nature 1989; 340 (6236): 692-696
  • 23 Vallar L, Spada A, Giannattasio G. Altered Gs and adenylate cyclase activity in human GH-secreting pituitary adenomas. Nature 1987; 330 (6148): 566-568
  • 24 Akirov A, Asa SL, Amer L, Shimon I, Ezzat S. The Clinicopathological Spectrum of Acromegaly. J Clin Med 2019; 8 (11) 1962 DOI: 10.3390/jcm8111962.
  • 25 Caron P, Brue T, Raverot G. et al. Signs and symptoms of acromegaly at diagnosis: the physician's and the patient's perspectives in the ACRO-POLIS study. Endocrine 2019; 63 (01) 120-129
  • 26 Rajasoorya C, Holdaway IM, Wrightson P, Scott DJ, Ibbertson HK. Determinants of clinical outcome and survival in acromegaly. Clin Endocrinol (Oxf) 1994; 41 (01) 95-102
  • 27 Colao A, Ferone D, Marzullo P, Lombardi G. Systemic complications of acromegaly: epidemiology, pathogenesis, and management. Endocr Rev 2004; 25 (01) 102-152
  • 28 Ahmad MM, Buhary BM, Al Mousawi F. et al. Management of acromegaly: an exploratory survey of physicians from the Middle East and North Africa. Hormones (Athens) 2018; 17 (03) 373-381
  • 29 Fleseriu M, Barkan A, Del Pilar Schneider M. et al. Prevalence of comorbidities and concomitant medication use in acromegaly: analysis of real-world data from the United States. Pituitary 2022; 25 (02) 296-307
  • 30 Molitch ME. Clinical manifestations of acromegaly. Endocrinol Metab Clin North Am 1992; 21 (03) 597-614
  • 31 Drange MR, Fram NR, Herman-Bonert V, Melmed S. Pituitary tumor registry: a novel clinical resource. J Clin Endocrinol Metab 2000; 85 (01) 168-174
  • 32 Mestron A, Webb SM, Astorga R. et al. Epidemiology, clinical characteristics, outcome, morbidity and mortality in acromegaly based on the Spanish Acromegaly Registry (Registro Espanol de Acromegalia, REA). Eur J Endocrinol 2004; 151 (04) 439-446
  • 33 Jenkins PJ, Sohaib SA, Akker S. et al. The pathology of median neuropathy in acromegaly. Ann Intern Med 2000; 133 (03) 197-201
  • 34 Nagulesparen M, Trickey R, Davies MJ, Jenkins JS. Muscle changes in acromegaly. BMJ 1976; 2 (6041): 914-915
  • 35 Layton MW, Fudman EJ, Barkan A, Braunstein EM, Fox IH. Acromegalic arthropathy. Characteristics and response to therapy. Arthritis Rheum 1988; 31 (08) 1022-1027 DOI: 10.1002/art.1780310813.
  • 36 Lieberman SA, Björkengren AG, Hoffman AR. Rheumatologic and skeletal changes in acromegaly. Endocrinol Metab Clin North Am 1992; 21 (03) 615-631
  • 37 Wassenaar MJE, Biermasz NR, van Duinen N. et al. High prevalence of arthropathy, according to the definitions of radiological and clinical osteoarthritis, in patients with long-term cure of acromegaly: a case-control study. Eur J Endocrinol 2009; 160 (03) 357-365
  • 38 Mazziotti G, Biagioli E, Maffezzoni F. et al. Bone turnover, bone mineral density, and fracture risk in acromegaly: a meta-analysis. J Clin Endocrinol Metab 2015; 100 (02) 384-394
  • 39 McGuffin Jr WL, Sherman BM, Roth F. et al. Acromegaly and cardiovascular disorders. A prospective study. Ann Intern Med 1974; 81 (01) 11-18
  • 40 Fazio S, Cittadini A, Sabatini D. et al. Evidence for biventricular involvement in acromegaly: a Doppler echocardiographic study. Eur Heart J 1993; 14 (01) 26-33
  • 41 Clayton RN. Cardiovascular function in acromegaly. Endocr Rev 2003; 24 (03) 272-277
  • 42 Damjanovic SS, Neskovic AN, Petakov MS. et al. High output heart failure in patients with newly diagnosed acromegaly. Am J Med 2002; 112 (08) 610-616
  • 43 Colao A, Spinelli L, Marzullo P. et al. High prevalence of cardiac valve disease in acromegaly: an observational, analytical, case-control study. J Clin Endocrinol Metab 2003; 88 (07) 3196-3201
  • 44 Coffey S, Cairns BJ, Iung B. The modern epidemiology of heart valve disease. Heart 2016; 102 (01) 75-85
  • 45 Kreze A, Kreze-Spirova E, Mikulecky M. Risk factors for glucose intolerance in active acromegaly. Braz J Med Biol Res 2001; 34 (11) 1429-1433
  • 46 Hoogenberg K, Sluiter WJ, Dullaart RP. Effect of growth hormone and insulin-like growth factor I on urinary albumin excretion: studies in acromegaly and growth hormone deficiency. Acta Endocrinol (Copenh) 1993; 129 (02) 151-157
  • 47 Weiss V, Sonka K, Pretl M. et al. Prevalence of the sleep apnea syndrome in acromegaly population. J Endocrinol Invest 2000; 23 (08) 515-519
  • 48 Grunstein RR, Ho KY, Sullivan CE. Sleep apnea in acromegaly. Ann Intern Med 1991; 115 (07) 527-532
  • 49 Rolla M, Jawiarczyk-Przybyłowska A, Halupczok-Żyła J. et al. Complications and comorbidities of acromegaly-retrospective study in Polish center. Front Endocrinol (Lausanne) 2021; 12: 642131 DOI: 10.3389/fendo.2021.642131.
  • 50 Broder MS, Neary MP, Chang E, Cherepanov D, Katznelson L. Treatments, complications, and healthcare utilization associated with acromegaly: a study in two large United States databases. Pituitary 2014; 17 (04) 333-341
  • 51 Katznelson L, Kleinberg D, Vance ML. et al. Hypogonadism in patients with acromegaly: data from the multi-centre acromegaly registry pilot study. Clin Endocrinol (Oxf) 2001; 54 (02) 183-188
  • 52 Cheung NW, Boyages SC. The thyroid gland in acromegaly: an ultrasonographic study. Clin Endocrinol (Oxf) 1997; 46 (05) 545-549
  • 53 Gasperi M, Martino E, Manetti L. et al; Acromegaly Study Group of the Italian Society of Endocrinology. Prevalence of thyroid diseases in patients with acromegaly: results of an Italian multi-center study. J Endocrinol Invest 2002; 25 (03) 240-245
  • 54 Renehan AG, Shalet SM. Acromegaly and colorectal cancer: risk assessment should be based on population-based studies. J Clin Endocrinol Metab 2002; 87 (04) 1909 , author reply 1909
  • 55 Rokkas T, Pistiolas D, Sechopoulos P, Margantinis G, Koukoulis G. Risk of colorectal neoplasm in patients with acromegaly: a meta-analysis. World J Gastroenterol 2008; 14 (22) 3484-3489
  • 56 Jenkins PJ, Frajese V, Jones AM. et al. Insulin-like growth factor I and the development of colorectal neoplasia in acromegaly. J Clin Endocrinol Metab 2000; 85 (09) 3218-3221
  • 57 Wolinski K, Czarnywojtek A, Ruchala M. Risk of thyroid nodular disease and thyroid cancer in patients with acromegaly–meta-analysis and systematic review. PLoS One 2014; 9 (02) e88787 DOI: 10.1371/journal.pone.0088787.
  • 58 Wright AD, Hill DM, Lowy C, Fraser TR. Mortality in acromegaly. Q J Med 1970; 39 (153) 1-16
  • 59 Bolfi F, Neves AF, Boguszewski CL, Nunes-Nogueira VS. Mortality in acromegaly decreased in the last decade: a systematic review and meta-analysis. Eur J Endocrinol 2018; 179 (01) 59-71
  • 60 Ritvonen E, Löyttyniemi E, Jaatinen P. et al. Mortality in acromegaly: a 20-year follow-up study. Endocr Relat Cancer 2016; 23 (06) 469-480
  • 61 Esposito D, Ragnarsson O, Granfeldt D, Marlow T, Johannsson G, Olsson DS. Decreasing mortality and changes in treatment patterns in patients with acromegaly from a nationwide study. Eur J Endocrinol 2018; 178 (05) 459-469
  • 62 Wu J-C, Huang W-C, Chang H-K, Ko C-C, Lirng JF, Chen Y-C. Natural history of acromegaly: incidences, re-operations, cancers, and mortality rates in a national cohort. Neuroendocrinology 2020; 110 (11-12): 977-987
  • 63 Arosio M, Reimondo G, Malchiodi E. et al; Italian Study Group of Acromegaly. Predictors of morbidity and mortality in acromegaly: an Italian survey. Eur J Endocrinol 2012; 167 (02) 189-198
  • 64 Holdaway IM, Rajasoorya RC, Gamble GD. Factors influencing mortality in acromegaly. J Clin Endocrinol Metab 2004; 89 (02) 667-674
  • 65 Colao A, Vandeva S, Pivonello R. et al. Could different treatment approaches in acromegaly influence life expectancy? A comparative study between Bulgaria and Campania (Italy). Eur J Endocrinol 2014; 171 (02) 263-273
  • 66 Bogazzi F, Colao A, Rossi G. et al. Comparison of the effects of primary somatostatin analogue therapy and pituitary adenomectomy on survival in patients with acromegaly: a retrospective cohort study. Eur J Endocrinol 2013; 169 (03) 367-376
  • 67 McCabe J, Ayuk J, Sherlock M. Treatment factors that influence mortality in acromegaly. Neuroendocrinology 2016; 103 (01) 66-74
  • 68 Esposito D, Ragnarsson O, Johannsson G, Olsson DS. Prolonged diagnostic delay in acromegaly is associated with increased morbidity and mortality. Eur J Endocrinol 2020; 182 (06) 523-531
  • 69 Sherlock M, Ayuk J, Tomlinson JW. et al. Mortality in patients with pituitary disease. Endocr Rev 2010; 31 (03) 301-342
  • 70 Schneider HJ, Kosilek RP, Günther M. et al. A novel approach to the detection of acromegaly: accuracy of diagnosis by automatic face classification. J Clin Endocrinol Metab 2011; 96 (07) 2074-2080
  • 71 Kong X, Gong S, Su L, Howard N, Kong Y. Automatic detection of acromegaly from facial photographs using machine learning methods. EBioMedicine 2018; 27: 94-102
  • 72 Katznelson L, Laws Jr ER, Melmed S. et al; Endocrine Society. Acromegaly: an endocrine society clinical practice guideline. J Clin Endocrinol Metab 2014; 99 (11) 3933-3951
  • 73 Freda PU. Pitfalls in the biochemical assessment of acromegaly. Pituitary 2003; 6 (03) 135-140
  • 74 Duncan E, Wass JA. Investigation protocol: acromegaly and its investigation. Clin Endocrinol (Oxf) 1999; 50 (03) 285-293
  • 75 Bonert V, Carmichael J, Wu Z. et al. Discordance between mass spectrometry and immunometric IGF-1 assay in pituitary disease: a prospective study. Pituitary 2018; 21 (01) 65-75
  • 76 Giustina A, Barkhoudarian G, Beckers A. et al. Multidisciplinary management of acromegaly: a consensus. Rev Endocr Metab Disord 2020; 21 (04) 667-678
  • 77 Dobri G, Niwattisaiwong S, Bena JF. et al. Is GH nadir during OGTT a reliable test for diagnosis of acromegaly in patients with abnormal glucose metabolism?. Endocrine 2019; 64 (01) 139-146
  • 78 Lonser RR, Kindzelski BA, Mehta GU, Jane Jr JA, Oldfield EH. Acromegaly without imaging evidence of pituitary adenoma. J Clin Endocrinol Metab 2010; 95 (09) 4192-4196
  • 79 Melmed S, Bronstein MD, Chanson P. et al. A Consensus Statement on acromegaly therapeutic outcomes. Nat Rev Endocrinol 2018; 14 (09) 552-561
  • 80 Fleseriu M, Langlois F, Lim DST, Varlamov EV, Melmed S. Acromegaly: pathogenesis, diagnosis, and management. Lancet Diabetes Endocrinol 2022; 10 (11) 804-826
  • 81 Giustina A, Chanson P, Bronstein MD. et al; Acromegaly Consensus Group. A consensus on criteria for cure of acromegaly. J Clin Endocrinol Metab 2010; 95 (07) 3141-3148
  • 82 Hazer DB, Işık S, Berker D. et al. Treatment of acromegaly by endoscopic transsphenoidal surgery: surgical experience in 214 cases and cure rates according to current consensus criteria. J Neurosurg 2013; 119 (06) 1467-1477
  • 83 Asha MJ, Takami H, Velasquez C. et al. Long-term outcomes of transsphenoidal surgery for management of growth hormone-secreting adenomas: single-center results. J Neurosurg 2019; 133 (05) 1-11
  • 84 Briceno V, Zaidi HA, Doucette JA. et al. Efficacy of transsphenoidal surgery in achieving biochemical cure of growth hormone-secreting pituitary adenomas among patients with cavernous sinus invasion: a systematic review and meta-analysis. Neurol Res 2017; 39 (05) 387-398
  • 85 Cardinal T, Rutkowski MJ, Micko A. et al. Impact of tumor characteristics and pre- and postoperative hormone levels on hormonal remission following endoscopic transsphenoidal surgery in patients with acromegaly. Neurosurg Focus 2020; 48 (06) E10 DOI: 10.3171/2020.3.FOCUS2080.
  • 86 Gadelha MR, Wildemberg LE, Kasuki L. The future of somatostatin receptor ligands in acromegaly. J Clin Endocrinol Metab 2022; 107 (02) 297-308
  • 87 Fleseriu M, Dreval A, Bondar I. et al. Maintenance of response to oral octreotide compared with injectable somatostatin receptor ligands in patients with acromegaly: a phase 3, multicentre, randomised controlled trial. Lancet Diabetes Endocrinol 2022; 10 (02) 102-111
  • 88 Bernabéu I, Fajardo C, Marazuela M. et al. Effectiveness of lanreotide autogel 120 mg at extended dosing intervals for acromegaly. Endocrine 2020; 70 (03) 575-583
  • 89 Bolanowski M, Kałużny M, Witek P, Jawiarczyk-Przybyłowska A. Pasireotide-a novel somatostatin receptor ligand after 20 years of use. Rev Endocr Metab Disord 2022; 23 (03) 601-620
  • 90 Gadelha MR, Bronstein MD, Brue T. et al; Pasireotide C2402 Study Group. Pasireotide versus continued treatment with octreotide or lanreotide in patients with inadequately controlled acromegaly (PAOLA): a randomised, phase 3 trial. Lancet Diabetes Endocrinol 2014; 2 (11) 875-884
  • 91 Almalki MH, Aljohani N, Alzahrani S. et al. Clinical features, therapeutic trends, and outcome of giant prolactinomas: a single-center experience over a 12-year period. Clin Med Insights Endocrinol Diabetes 2020; 13: 1179551420926181
  • 92 Sandret L, Maison P, Chanson P. Place of cabergoline in acromegaly: a meta-analysis. J Clin Endocrinol Metab 2011; 96 (05) 1327-1335
  • 93 Sahin S, Fidan MC, Korkmaz OP, Durcan E, Ozkaya HM, Kadioglu P. Effectiveness of cabergoline treatment in patients with acromegaly uncontrolled with SSAs: experience of a single tertiary center. Exp Clin Endocrinol Diabetes 2021; 129 (09) 644-650
  • 94 van der Lely AJ, Hutson RK, Trainer PJ. et al. Long-term treatment of acromegaly with pegvisomant, a growth hormone receptor antagonist. Lancet 2001; 358 (9295): 1754-1759
  • 95 Leonart LP, Tonin FS, Ferreira VL, Fernandez-Llimos F, Pontarolo R. Effectiveness and safety of pegvisomant: a systematic review and meta-analysis of observational longitudinal studies. Endocrine 2019; 63 (01) 18-26
  • 96 Fleseriu M, Führer-Sakel D, van der Lely AJ. et al. More than a decade of real-world experience of pegvisomant for acromegaly: ACROSTUDY. Eur J Endocrinol 2021; 185 (04) 525-538
  • 97 Chiloiro S, Costa D, Lauretta R. et al. Partial response to first generation SSA guides the choice and predict the outcome of second line therapy in acromegaly. Endocrine 2022; 78 (02) 343-353
  • 98 Ishida A, Shichi H, Fukuoka H, Shiramizu H, Inoshita N, Yamada S. Temozolomide and capecitabine treatment for an aggressive somatotroph pituitary tumor: a case report and literature review. Front Oncol 2022; 12: 916982 DOI: 10.3389/fonc.2022.916982.
  • 99 Giustina A, Barkan A, Chanson P. et al; Pituitary Society, ; European Neuroendocrine Association. Guidelines for the treatment of growth hormone excess and growth hormone deficiency in adults. J Endocrinol Invest 2008; 31 (09) 820-838
  • 100 Melmed S, Colao A, Barkan A. et al; Acromegaly Consensus Group. Guidelines for acromegaly management: an update. J Clin Endocrinol Metab 2009; 94 (05) 1509-1517
  • 101 Hannon MJ, Barkan AL, Drake WM. The role of radiotherapy in acromegaly. Neuroendocrinology 2016; 103 (01) 42-49
  • 102 Eastman RC, Gorden P, Glatstein E, Roth J. Radiation therapy of acromegaly. Endocrinol Metab Clin North Am 1992; 21 (03) 693-712
  • 103 Powell JS, Wardlaw SL, Post KD, Freda PU. Outcome of radiotherapy for acromegaly using normalization of insulin-like growth factor I to define cure. J Clin Endocrinol Metab 2000; 85 (05) 2068-2071
  • 104 Biermasz NR, van Dulken H, Roelfsema F. Long-term follow-up results of postoperative radiotherapy in 36 patients with acromegaly. J Clin Endocrinol Metab 2000; 85 (07) 2476-2482
  • 105 Gheorghiu ML. Updates in outcomes of stereotactic radiation therapy in acromegaly. Pituitary 2017; 20 (01) 154-168
  • 106 Fleseriu M, Biller BMK, Freda PU. et al. A Pituitary Society update to acromegaly management guidelines. Pituitary 2021; 24 (01) 1-13
  • 107 Abu Dabrh AM, Asi N, Farah WH. et al. Radiotherapy versus radiosurgery in treating patients with acromegaly: a systematic review and meta-analysis. Endocr Pract 2015; 21 (08) 943-956
  • 108 Erfurth EM, Bülow B, Mikoczy Z, Svahn-Tapper G, Hagmar L. Is there an increase in second brain tumours after surgery and irradiation for a pituitary tumour?. Clin Endocrinol (Oxf) 2001; 55 (05) 613-616
  • 109 Minniti G, Traish D, Ashley S, Gonsalves A, Brada M. Risk of second brain tumor after conservative surgery and radiotherapy for pituitary adenoma: update after an additional 10 years. J Clin Endocrinol Metab 2005; 90 (02) 800-804