Acromegaly and comorbid conditions. New possibilities of diagnosis and treatment (literature review)

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Based on the data published in Russian and foreign reference sources, an analysis of clinical-hormonal peculiarities, modern methods of treatment of acromegaly combined with polyendocrinopathies (diabetes mellitus, diffuse and nodular goiter, hypocorticoidism) and cardiovascular diseases was conducted. According to different authors, a decline in the quality and duration of life of patients is associated with significant changes in the endocrine system caused by contrainsular and stimulating effect of somatotropic hormone (STH) and insulin-like growth factor 1 (IGF-1) on organs and tissues. Secondary diabetes mellitus was identified in 16-46% of patients, nodular goiter in 30-70%, secondary adrenal insufficiency in 11-20% of patients. The most common cause of acromegaly is an active pituitary tumor – somatotropinoma, rarely STH is overproduced by neuroendocrine cells, located endo- and extracranially. Recent achievements in neuroendocrinology provided significant improvement of management of patients. The aim of treatment for acromegaly is to achieve clinical and biochemical remission of the disease. At present three basic methods of treatment for acromegaly are used: surgical (endonasal transsphenoidal adenomectomy), drug therapy, radiation therapy and stereotactic radiosurgery (cyber knife). Differential and combined use of modern medical drugs in the form of monotherapy and in a combination with surgical and radiation treatment permits to achieve both clinical and hormonal remission of acromegaly improving in this way the quality and duration of life of patients. In the given review of literature modern concepts of etiology, pathogenesis, clinical peculiarities, modern methods of diagnosis and treatment of this disease are presented.

Acromegaly is a severe neuroendocrine disease caused by overproduction of somato-tropic hormone (somatotropin, STH), and of insulin-like growth factors (IGF-1, IGF-2) in individuals with completed physiological growth. The disease is characterized by disproportional periosteal pathological growth of bones, cartilages, internal organs, soft tissues, and also by disorders in the morphological and functional condition of the cardio-vascular system, peripheral glands, metabolism. The time interval between appearance of the first symptoms of the disease and making the diagnosis is 5-15 years. In the previous century incidence of acromegaly ranged from 40 to 60 cases per 1 mln of individuals. Belgian research of 2006 gives higher figures – more than 100 cases per 1 million [1]. According to data of Moscow register of 2016, 506 patients with acromegaly are under regular medical check-up, 138 (27%) men and 368 (73%) – women. Within three years 195 patients with acromegaly were identified, 139 women and 46 men, of the average age 46 years. The onset of the disease occurs in the 3d-4th decade of life – the most productive years in the working population. In 144 (26%) patients the disease began at the age of 50-69 years, in 103 (20%) – at the age of 40-49 and in 99 (19%) – at the age of 60-69. The ratio of micro/macroadenomas was 1.0:1.4 [2].

The leading cause of sporadic forms of gigantism and acromegaly is pituitary adenoma (somatotropinoma) with autonomous excessive secretion of STH or of its active forms [3]. Adenomas are monoclonal tumors resulting from somatic mutation of GSP-protein (GSP-oncogen) responsible for dimerization of alpha- and beta-subunits of receptor G-proteins which, being normally stimulated by somatoliberin, activate adenylate cyclase and stimulate intracellular production of cAMP required for increase in the functional activity and mitotic activity of somatotrophs [4,5]. Mutation and structural alteration of receptor proteins cause permanent activation of adenylate cyclase with frustration of its natural inhibition with the result of excessive accumulation of cAMP in the cytosol that becomes the direct cause of uncontrollable proliferation of somatotropic cells with enhanced secretion of STH. In 20-25% of cases mixed pituitary adenomas are identified which, besides STH, produce prolactin, thyrotropic hormone (TTH), adrenocorticotropic hormone (ACTH), luteinizing hormone (LH), follicle stimulating hormone (FSH), alpha-subunit. Very rarely (in 2% of cases) the cause of acromegaly is an ectopic tumor that arises from neuroendocrine cells and may be located endocranially (tumor of pharyngeal and sphenoidal sinus) or extracranially (tumor of lungs, mediastinum, pancreas, gonads, intestine) [5,6].

Clinical symptoms of acromegaly are defined by compressive effect of soma-totopinoma on the surrounding tissues (headache, hypopituitarism, narrowing of fields of vision, hydrocephaly, hypothalamic disorders), and by numerous systemic manifestations of long-term production of STH and IGF-1 (insulin-like growth factor-1) [6].

The speed of growth of somato-tropinoma, its hormonal activity and character of complication at the onset of the disease are largely determined by the age of a patient. In young patients the clinical picture is characterized by complications associated with mass-effect (neurological, vision disorders, partial pituitary insufficiency) with the extent of evidence directly proportional to the volume of tumorous tissue. In patients of middle age at the beginning of the disease metabolic and multiorgan disorders dominate that can be attributed to late diagnosis, age-related changes, duration of the active stage [1,4,6]. There are noted a characteristic enlargement of the facial traits (cheek bones, superciliary arches), prognathism, hypertrophy of soft tissues (lips, nose, ears). Progressing expansion of the circumference of the head, enlargement of feet, bones, thickening of fingers are noted. Expansion of nasal sinuses and enlargement of the vocal cords determines a thick deep voice [5,7]. A common complication of acromegaly is acromegalic cardiomyopathy affecting patients of any age and characterized by disorders in the cardiac rhythm, hypertrophy of the myocardium of the left ventricle (HMLV). Unless hormonal disorders in acromegaly are timely corrected, cardiomyopathy leads to diastolic cardiac failure [7,8]. Development of arterial hypertension in patients is associated with insulin resistance, retention of sodium, water, exaggerated vessel tone, reduced production of atrial natriuretic peptide [8,9]. According to some authors, the extent of elevation of arterial pressure correlates rather with the duration of the disease and the age of patient than with the level of growth hormone [9,10]. Damage to the central and peripheral nervous system is caused by aggressive growth of somato-tropinoma and compression of peripheral nervous trunks by edematous soft tissues and bone formations [10,11]. Elevation of the intracranial pressure and compression of the diaphragm of sella turcica by the tumor provokes persisting headaches [11]. A common complication of acromegaly is secondary diabetes mellitus. According to the results of modern research, the incidence of early disorders of carbohydrate metabolism in acromegaly ranges from 16% to 46% [11,12]. Pathogenesis of secondary diabetes mellitus in acromegaly consists in a complex of changes associated, on the one hand, with development of hepatic and peripheral insulin resistance, and on the other hand with hyperinsulinemia [12]. Diabetes mellitus in patients with acromegaly may be considered an additional risk factor for atherogenic dyslipidemia, hyperfibrinogenemia and platelet dysfunctions in the form of reduction of disaggregation properties and enhancement of release reactions [13].

A study of structural and functional condition of the thyroid may reveal its enlargement with or without nodular structures in 35-70% of cases. Structural changes in the thyroid are induced by direct influence of IGF-1. Histological examination shows predominating signs of the proliferating colloid goiter. Other signs are autoimmune thyroiditis, toxic goiter, papillary cystoadenoma. Structural changes in the gland mainly develop with the underlying euthyroidism. Hypothyroidism develops in case of formation of multiple nodules, especially with the underlying autoimmune thyroiditis (primary hypothyroidism), and also in case of compression of thyrotrophs by somatotropinoma leading to reduction in TTH production (secondary hypothyroisim). Rarely these conditions coexist. Thyrotoxicosis in acromegaly is not common (2-10% of cases). Rare cases of secondary thyrotoxicosis are reported which result from overproduction of TTH by mixed adenoma of pituitary [4,14].

In about 11-20% of cases disorders in the adrenal functions are noted. In most cases secondary adrenal insufficiency is identified that results either from compression of corticotrophs by growing somatotropinoma, or develops in postoperative period after removal of adenoma [4,15].

With the presence of characteristic complaints and clinical (external) signs of acromegaly, complex laboratory-instrumental examination is required to confirm the diagnosis and determine further treatment approach [15,16]. At present, the main laboratory diagnostic method is measuring the levels of growth hormone and IGF-1 in blood [1,2,16]. Normal concentration of STH in healthy individuals is 5-10 ng/ml, while in remission of acromegaly it should not exceed 2.5 ng/ml [16]. The gold standard of laboratory diagnosis of acromegaly is oral glucose tolerance test (OGTT). It was found that intake of 75 g of glucose leads to reduction in the STH to the minimal detectable level in 94% of healthy individuals. After intake of glucose solution, blood is taken in a fasting patient every 30 minutes within 2 hours. The test is considered positive if the level of STH does not fall below 1 ng/ml (2.7 mUn/l). Such reaction is observed in the majority of patients in the active stage of acromegaly. Moreover, more than 40% of patients with acromegaly show a paradoxical increase in STH level in response to increase in glucose level [5,15,17]. In the opinion of many authors, the best diagnostic criterion that confirms overproduction of STH is the level of IGF-1 in blood plasma. The advantages of this marker are as follows: a high level of IGF-1 gives a typical clinical picture of acromegaly; the value of IGF-1 reflects the average value of STH on the previous day; IGF-1 does not show any significant variations within a short period of time; even a slightly elevated level of STH is reflected by a high level of IGF-1 [15,17].

It should be taken into account that the level of IGF-1 depends on the gender, age and dietary habits. It may probably change (up to the normal age- and gender-related norm) in case of any disorder in nutrition, hepatic insufficiency and starvation. Besides determination of STH and IGF-1, other laboratory markers of acromegaly are the level of somatoliberin in blood, test with thyroliberin and somatoliberin, the level of STH in 24-hour urine and also in blood of inferior cavernous sinuses, the level of IGF-1-binding protein-3. In real clinical practice these laboratory diagnostic methods are practically out of use [3-5,15,17].

By the international consensus the main criteria are determined for exclusion of acromegaly: STH level <1 ng/ml, IGF-1 corresponding to the age-related norm, minimal level of STH after OGTT <0,4 ng/ml, the average integrated STH for 24 hours <2,5 ng/ml [18]. The main method of radiodiagnosis of tumors of the pituitary is magnetic resonance imaging (MRI) [5,18]. It gives information about location, structure, spread of the pathological process and permits to carry out a successive control of treatment with no limitation of number of examinations [19]. The most promising direction of further development of MRI diagnosis is dynamic MRI diagnosis with bolus injection of a contrast substance. According to some authors, dynamic contrast MRI possesses significant advantages over ordinary contrast MRI, since it permits not only to detect accumulation of contrast substance in tumor, but also to determine the dynamics of this pathological process and to identify quantitative-temporal parameters of the accumulation [19,20].

Medical treatment of acromegaly suggests use of modern means of surgical, medicinal or radiation control of growth and secretory activity of pituitary adenoma taking into account the extent of mass-effect, peculiarities of clinical course and somatic conditions of patients [21]. The first line treatment of microadenomas and intrasellar macroadenomas is transsphenoidal adenomectomy [20,21].

Surgical method is also indicated in case of appearance of mass-effect of the growing tumor, evident cranialgia, progressing disturbances in vision. After surgical removal of adenoma, complete hormonal remission (with optimization of the level of IGF-1 in blood) is observed in 70-80% of cases, after removal of macroadenoma remission is achieved only in 40-60% of patients. A large size of adenoma makes it technically difficult to achieve clinico-biochemical remission because of invasive growth of tumor into surrounding structures. In 43% of cases growth continues and in 2-3% recurrent course is noted [22,26]. Transcranial method is used when use of transsphenoidal method is impossible. Transsphenoidal approach is divided into microsurgical (with use of a microscope) and endoscopic. There also exists a method of microscopic removal of pituitary adenomas with auxiliary endoscopic control. Advantages of modern endoscopy (optimal illumination, phenomenon of endomicroscopy and lateral viewing) permit intraoperative determination of the boundaries of adenoma and identification of location and size of the remaining non-removed parts of the tumor. Currently in real clinical practice 3-D endoscopes are already in use with different levels of signal transmission (binocular frame structures, transmission of 3-D image with computerized processing in 3-D mode, systems emulating true 3-D images) [23,24,25]. Lateral view of endoscope permits to remove adenoma from the optimal side avoiding damaging brain structures and the contents of cavernous sinuses. In case of intraoperative liquorrhea, the method permits its verification and management [23,26].

In modern surgery in general and in neurology in particular, a tendency is observed to maximal possible use of minimally invasive surgery. Introduction and subsequent perfection of the transshenoidal approach permitted to significantly reduce the number of postoperative complications. Despite the fact that development of technologies, surgeon’s experience, knowledge of anatomy permit to avoid many potential complications of surgical interventions, the risk of vessel damages should not be completely excluded. It is especially important in view of the increasing number of surgeries on different formations in the sellar area [24-26].

Recently, effective pharmaceutical drugs are being actively introduced into the world pharmacological practice facilitating normalization of a disturbed hormonal function. They include non-selective and selective agonists of dopamine receptors, of somatostatin analogues (SA) and blockers of STH receptors. All these promising medical drugs possess advantages and indications to use [27]. Use of SA is the primary medical treatment of acromegaly [27,28]. Drugs of this group directly realize their effect through type 2 and 5 somatostatin receptors with the result of reduction of secretory activity of STH-producing adenoma [27-29]. Currently in Russian Federation the following medical drugs of SA group are registered [27-29]:

А.Octreotide-containing drugs:

  1. fast-acting forms for subcutaneous introduction – Sandostatin, Octreotide (50, 100 and 300 µg/ml).
  2. long-acting forms for intramuscular introduction – Sandostatin LAR, Octreotide-Depo, Octreotide-Long at doses (10, 20 and 30, 40 mg once in 28 days).
  3. Lanreotide-containing long-acting form – Somatuline Autogel (120 mg once in 4–8 weeks subcutaneously).

According to data of Moscow region register, initial treatment with SA at a dose 20 mg resulted in a complete remission (that is, achievement of the target biochemical hormonal values) in 23 of 79 (29.1%) patients, in another 10 (12.7%) patients at least one target parameter (STH or IGF-1) was achieved [30].

The most well-known original drug of the group of octreotide-containing somato-statin analogues is Octreotide-Depo (Long) prolonged effect of which is due to incorporation of the active substance (octreotide) into microspheres consisting of a specific poly-DL-lactid-coglycolide-glucose polymer pro-viding slow release of the medical drug from intramuscular storages [27,28,30]. After a certain time the introduced microspheres undergo biodegradation by hydrolysis. At a dose of the medical drug 10-40 mg the therapeutic concentration of Octreotide-Depo in blood remains unchanged within 28 days. Another original long-acting medical preparation of SA registered in Russian Federation is Somatuline Autogel 120 mg with the active substance lanreotide. Incorporation of D-tryptophan into the structure of the drug improves its stability, and of D-alanine improves selectivity of action of the molecule. Somatuline Autogel is an oversaturated aqueous solution of lanreotide with formation of gel. Advantages of the drug include the absence of pharmacological carrier, prolonged effect (up to 56 days) due to slow diffusion of crystals from the subcutaneous storage, uniform pharmacokinetic effect without any initial spikes of increased concentrations, ready for use pharmaceutical form, small volume of introduction, method of introduction – subcutaneous. Another positive side of Somatuline Autogel is a possibility (according to indications) to prolong intervals between injections up to 8 weeks, which undoubtedly improves the extent of liberty and quality of life of patients. In the 70-80s the leading drug in pharmacotherapy of acromegaly was a stimulator of dopaminergic receptors – a semisynthetic ergot alkaloid – bromocriptine – which induced a paradoxical reduction of STH in about 40-50% of patients [27,28,31]. Currently it is replaced with selective long-acting D2-agonists of dopamine (quinagolide and caber-goline). Cabergoline at a dose 1.0-3.5 mg a week reliably reduces IGF-1 in 60-70% of patients, with complete normalization of this parameter in 30-50% of cases. Reduction in size of somatotropinoma was noted in 55% of cases. Cabergoline still retains its proven effectiveness in acromegaly, but, despite this, the result of its clinical use is insignificant: remission was seen only in 10% of cases [30,31]. According to the modern recommendations, cabergoline may be indicated for treatment of acromegaly in patients who prefer only peroral drugs, who refused from surgery, after incomplete adenomectomy – in a combination of hyperprolactemia and not high levels of STH and IGF-1, and also in combined therapy of patients taking maximal doses of SA [32].

In 2000 a principally new medical drug was introduced for treatment of acromegaly – pegvisomant (somavert, Pfizer Inc.) which is a genetically engineered analogue of endogenous STH with 9 mutations, antagonist of growth hormone receptors. One of the most important effects of pegvisomant is the ability to normalize different metabolic disorders that almost always exist in patients with acromegaly and are the main cause of their disability and death. Recent research conducted by a group of Italian scientists proved that treatment with pegvisomant within 18 months results in a significant regress of manifestations of acromegalic cardiomyopathy and increases tolerance to physical loads. This conclusion is based on the results of a dynamic study of different hemodynamic parameters using radionucleotide angiography at rest and after physical load. Pegvisomant normalizes lipid metabolism as well as levels of leptin and parameters of bone remodeling [33].

The third method of treatment for acromegaly is radiation therapy. There exist two main kinds of radiation therapy: conventional fraction radiation therapy and stereotactic radiosurgery [3,5,34]. Stereotactic radiosurgery includes: gamma knife, cyber knife and linear accelerator using high-energy photons. Some centers use proton particles for stereotactic radiosurgery [1,35]. Its main difference from fraction radiotherapy is the possibility to direct a one-time high dose through a narrow focused beam to a distinctly limited zone (area) which significantly reduces the number of complications and improves the effectiveness of the given type of radiotherapy [35]. In irradiation with gamma knife method, gamma rays emitted from 201 sources containing radioactive cobalt-60, are concentrated on a narrow field. Remission comes in 2 to 7 years. Radiotherapy may be used as an additional method of treatment after conducted neurosurgical treatment (sometimes after repeated treatment), in case of insufficient sensitivity to somatostatin analogues and in high proliferation index Ki-67 [1,4,35-37].


Thus, modern diagnostic methods (magnetic resonance imaging of pituitary, determination of somatotropic hormone and insulin-like growth factors in blood) permit maximally early identification of acromegaly. The main methods of treatment (endonasal transsphenoidal adenomectomy, primary and secondary medicinal therapy, stereotactic radiosurgery improve the quality and duration of patients’ life. Effectiveness of therapy is guaranteed by a long period of maintenance of normal concentrations of somatotropic hormone and insulin-like growth factors which is confirmed by international research.

Authors have no conflict of interest to declare.

A. U. Zhulidova

Author for correspondence.
ORCID iD: 0000-0003-1381-1884
SPIN-code: 2012-8600
Ryazan State Medical University
Russian Federation, 9, Vysokovoltnaja, Ryazan, 390026

PhD Student of the Department of Faculty Therapy with a Course of Endocrinology, Clinical Pharmacology and Occupational Diseases

I. I. Dubinina
ORCID iD: 0000-0001-6726-1756
Ryazan State Medical University
Russian Federation, 9, Vysokovoltnaja, Ryazan, 390026

MD, Grand PhD, Professor of the Department of Faculty Therapy with a Course of Endocrinology

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