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HOME > Endocrinol Metab > Volume 35(2); 2020 > Article
Review Article
Epidemiology of Functioning Pituitary Adenomas
Sang Ouk Chinorcid
Endocrinology and Metabolism 2020;35(2):237-242.
DOI: https://doi.org/10.3803/EnM.2020.35.2.237
Published online: June 30, 2020

Department of Endocrinology and Metabolism, Kyung Hee University College of Medicine, Seoul, Korea

Corresponding author: Sang Ouk Chin. Department of Endocrinology and Metabolism, Kyung Hee University College of Medicine, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea, Tel: +82-2-958-8200, Fax: +82-2-968-1848, E-mail: jan27th@khu.ac.kr
• Received: April 21, 2020   • Revised: May 11, 2020   • Accepted: May 12, 2020

Copyright © 2020 Korean Endocrine Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Pituitary adenomas (PAs) are defined as benign monoclonal tumors in the pituitary gland that cause symptoms due to either hormonal hypersecretion or a space-occupying effect, and are classified as functioning or non-functioning. Because of their rarity and slow-growing with symptomless nature in most cases, it has been challenging to investigate the epidemiology of PAs. Considering their public health impact and association with increased morbidity and mortality, however, it is essential to understand the prevalence and incidence of PAs in order to improve patient outcomes and to minimize the resultant burden on the health care system. Fortunately, developments in imaging modalities and easier access to large-scale population data have enabled investigators to analyze the epidemiology of PAs more accurately. This review summarizes previously reported epidemiologic data on functioning PAs in Korea and other countries.
Pituitary adenomas (PA) are defined as benign monoclonal tumors in the pituitary gland that cause symptoms due to either hormonal hypersecretion or a space-occupying effect [1]. These generally slowly-growing tumors are known to be the most common cause of hormonal hypersecretion or hyposecretion in adults. Following gliomas and meningiomas, PAs are the third most common type of brain tumor, accounting for 10% to 15% of all brain tumors [2], and they are the most common type of neuroendocrine tumor found in the central nervous system [3]. Pituitary carcinomas—defined as pituitary tumors with distant metastasis—are very rare, accounting for fewer than 0.2% of all cases of pituitary tumors [4].
PAs are divided into macroadenomas (>10 mm in diameter) or microadenomas (≤10 mm in diameter), and those with a diameter >40 mm are also called giant adenomas [4,5]. In addition, PAs are classified as either functioning or non-functioning depending on whether they have a hormonal hypersecretory capacity [6]. Depending on the type of hormone secreted, functioning PAs are sub-classified as prolactin-, growth hormone (GH)-, adrenocorticotropic hormone (ACTH)-, or thyrotropin-producing adenomas. A third of PAs are non-functioning, mostly including macroadenomas that frequently secrete gonadotropin or prolactin but have no symptoms resulting from hormonal hypersecretion [3,79]. Also, the pathologic classifications based on the immunohistochemical analyses, electron microscopy findings, and the demonstration of various transcription factors have been also introduced (Table 1) [10].
PAs were previously considered to be very rare, but recent data have revealed that their prevalence is higher than previously reported, potentially due to developments in imaging techniques and the increased detection of incidentalomas found during radiological work-ups for other diseases [11]. Traditionally, epidemiologic data on PAs were collected from anatomical studies using data obtained from the autopsy studies or the magnetic resonance imaging. However, these methods often have the limitations of representing a relatively old population or not reflecting the actual epidemiology of clinically relevant PAs [1]. Epidemiologic data on PAs based on a national-level cancer registry have been reported, but it has also limitation of underestimating the actual prevalence of PAs due to the lack of mandatory reporting [12]. Recently, population studies on the basis of big data analysis using national insurance claims data in Korea have been published [13,14]. Despite the issue on the accuracy of their operational definitions, used in these studies, they have the advantage of enabling investigators to obtain epidemiologic data from the general population, and this method has therefore been applied in various studies for other diseases [1517]. This review summarizes the previously reported epidemiologic data on functioning PAs in Korea and other countries.
Acromegaly is a chronic disease caused by the hypersecretion of GH, and GH-producing PAs are found in 95% of acromegaly patients [18]. Although acromegaly has also been reported to be caused by ectopic hypersecretion of GH [19,20] or excess production of GH-releasing hormone [21], these etiologies are very rare. Since GH-producing PAs account for most cases of acromegaly, it is reasonable to assume that the prevalence and incidence of acromegaly are identical to those of GH-producing PAs. According to large population-based studies published as of 2000, the prevalence of GH-producing PAs was 3.3 to 13.7 cases per 100,000, and the annual incidence was 0.2 to 1.1 cases per 100,100 [2233]. These figures are relatively higher than those reported before 2000 (prevalence: 3.8 to 6.9/100,000; annual incidence: 0.28 to 0.4/100,000) [3437]. As described above, this difference may be due to the disparities in the study population (general population vs. limited cases from tertiary centers or smaller numbers of included cases), developments in imaging techniques, and the increased frequency of performing imaging work-ups.
Not many studies have investigated the epidemiology of acromegaly in Korea. The first case of acromegaly in Korea was reported in 1965 [38], and the Survey Committee for Endocrine Diseases in the Korean Endocrine Society performed a nationwide survey regarding PAs in Korea in 1994. Based on the clinical information of 279 cases of acromegaly collected from 26 university hospitals in Korea, the annual incidence rate was estimated to be 1.4 cases per million [39]. This was lower than the rates previously reported in other countries, and the discrepancy was speculated to be due to limitations in the survey methodology. In the early 2000s, the Rare Disease Study Group in the Science and Research Committee of the Korean Endocrine Society conducted an updated version of nationwide survey of acromegaly in Korea. Clinical information of 1,350 patients with acromegaly diagnosed and treated between 2003 and 2007 at 74 hospitals in Korea was collected and analyzed. The annual incidence was calculated as 3.9 cases per million and the prevalence was 27.9 cases per million [40]. A limitation of survey methods is their high likelihood of representing patients treated at tertiary hospitals. In order to compensate for this limitation, Park et al. [13] analyzed the Korean Health Insurance Review and Assessment (HIRA) claims database between 2010 and 2014 and reported an annual incidence rate of 3.57 per million.
With mostly benign, prolactin-producing PAs (prolactinomas) are known to be one of the most common causes of hyperprolactinemia. Although hyperprolactinemia can be caused by various etiologies, including pregnancy, breastfeeding, exercise, stress, renal or thyroid insufficiency, drugs, and pituitary stalk compression by a non-prolactin-producing tumor or other parasellar masses [41], prolactin-producing PAs are considered to be the most clinically important etiological factor underlying hyperprolactinemia [42].
Ezzat et al. [43] performed a meta-analysis demonstrating that prolactinomas were the most common PAs, accounting for 25% to 41% according to radiologic or autopsy studies. According to the community-based cohort studies conducted in Liège, Belgium and Banbury, the United Kingdom (UK), prolactinomas were found to be the most common PAs (66.2% in Liège, Belgium and 57% in Banbury, UK), with a prevalence of 6 to 44.4 cases per 100,000 [22,23]. Both studies demonstrated a female predominance of prolactinomas with being most common in those under the age of 60. Consistent results were reported in a retrospective analysis of patients who received surgical therapy for PAs; prolactinomas were 10-fold more common in female patients aged between 18 to 50 years, but the male-to-female ratio equalized in older patients [44].
As with acromegaly, there are not many studies which have investigated the epidemiology of prolactinomas in Korea. Cho et al. [3] retrospectively reviewed the clinical data of 506 patients who underwent surgical therapy for PAs between 2006 and 2011 at a single center, and reported that prolactinomas accounted for 16.6% of PAs, making them the most common type. According to the analysis by Park et al. [14] of the HIRA claims database between 2009 and 2013, the prevalence of prolactinomas in Korea increased from 38.5 to 68.6 cases per million, while the annual incidence showed a sex disparity, at 1.0 to 1.6 cases per million in males and 27 to 29 cases per million in females [14].
Cushing syndrome (CS) was first reported by Dr. Harvey Cushing in 1912 [45]. It is divided into exogenous CS, which is caused by glucocorticoid use, and endogenous CS, which is classified as (1) ACTH-producing PAs (Cushing disease [CD]); (2) cortisol overproduction by adrenal adenomas or carcinomas via ACTH-independent mechanisms; and (3) ectopic production of ACTH or corticotropin-releasing hormone by neuroendocrine tumors [46]. ACTH-producing PAs are the most common cause of endogenous CS, accounting for approximately 60% of cases [46].
CD is a very uncommon disease. Most publications presenting epidemiologic data on CD focused on the entire spectrum of endogenous CS, while few studies have investigated the epidemiology of CD only. A population-based study from Vizcaya in a region of Basque Country (Spain) between 1975 and 1992 reported that there were 49 patients diagnosed with CD, corresponding to an annual incidence of 2.4 cases per million and a prevalence of 39.1 cases per million [47]. A similar study conducted using the National Patient Register of the Danish National Board of Health between 1985 and 1995 found that approximately 60% of patients with endogenous CS were diagnosed with CD, with 73 (1985 to 1990) and 99 cases (1991 to 1995) of CD among a total of 166 cases of endogenous CS [48]. The annual incidence was 1.2 (1985 to 1990) and 1.7 cases (1991 to 1995) per million [48].
In Korea, the Survey Committee for Endocrine Diseases in the Korean Endocrine Society performed a nationwide survey to collect clinical data from patients diagnosed with endogenous CS between 1992 and 1998. In total, 180 cases of endogenous CS from 51 university hospitals in Korea were collected and analyzed, yielding an annual incidence of 0.84 cases per million [49]. The proportion of CD was 48.3%, similar to that of adrenal CS (48.9%) [49]. Since then, no additional studies have investigated the epidemiology of CD in Korea. A report by Park et al. [14] only demonstrated the prevalence of endogenous CS because of the small number of CD cases collected during the analysis. The annual incidence of endogenous CS was 4.5 cases (male) and 17.2 cases (female) per million, and the prevalence was 51.7 cases per million in 2013 [14].
Thyrotropin-producing PAs are extremely rare, accounting for the smallest proportion of functional PAs. This disorder may be suspected when thyroid-stimulating hormone (TSH) is inappropriately normal or elevated in patients with hyperthyroidism. Defined as central hyperthyroidism, this condition requires a careful differential diagnosis between thyrotropin-producing PAs and thyroid hormone resistance syndrome. Thyrotropin-producing PAs were first reported by Jailer and Holub [50] in 1960, and more than 450 cases have been reported worldwide [50,51].
In the United States, a single-center study that investigated a total of 1,628 patients who underwent surgical treatment for PAs between 1993 and 2013 demonstrated that 1.2% of the cases (n=20) were found to be thyrotropin -producing PAs, and their proportion increased in recent years [52]. In Japan, a single-center study reported that 2.7% of patients (n=90 of 3,276) who underwent surgical treatment for PAs had a diagnosis of a thyrotropin-producing PA [53]. Yoon et al. [54] reported the first patient with a thyrotropin-producing PA in Korea, and since that time 11 cases have been reported in Korea [55]. According to the result of a single-center study in Korea that analyzed the clinical information of 484 patients who received surgical treatment for PAs, 1.65% (n=8) of the patients had a diagnosis of a TSH-producing PA [55].
A study in Sweden using the Swedish Pituitary Registry reported that the annual incidence of thyrotropin-producing PAs recently increased from 0.05 (1990 to 1994) to 0.26 cases per million (2005 to 2009) [56]. The annual incidence was reported to be 0.32 per million in Finland [27]. This trend is likely due to physicians’ increased awareness regarding the concept of inappropriate secretion of TSH, the introduction of ultrasensitive immunometric TSH assays that reliably differentiate between suppressed and normal TSH levels, and advances in pituitary imaging techniques that detect pituitary microadenomas more accurately [57].
Because of their rarity and slow-growing, symptomless nature in most cases, it is very difficult to collect clinically reliable information on patients with PAs, which presents a solid barrier to investigations of the epidemiology of this disorder. As population studies based on big-data analyses have become more common and provided easier access to more dependable data; however, the prevalence and incidence of PAs have been found to increase over the past years. Considering their impacts upon public health and their associations with increased morbidity and mortality, as well as the economic burden that they place on the health care system, it is essential to understand the epidemiology of PAs. As mentioned repeatedly, not many studies have investigated the epidemiology of PAs in Korea, and updated and larger studies regarding the epidemiology of PAs are necessary.
Acknowledgements
I would like to express my most sincere gratitude to professor Sung-Woon Kim in Kyung Hee University for giving me wonderful opportunities and teaching to take part in and enjoy the field of neuroendocrinology.

CONFLICTS OF INTEREST

No potential conflict of interest relevant to this article was reported.

Table 1
Classification of Pituitary Adenomas
Size Function Hormone Pathology (WHO)a Morphofunctional subclassificationa
Microadenoma
Macroadenoma
Giant adenoma
Functioning
Non-functioning
Prolactin Lactotroph adenoma (LA) Sparsely granulated LA
Densely granulated LA
Acidophilic stem cell adenoma
Growth hormone Somatotroph adenoma (SA) Densely granulated SA
Sparsely granulated SA
Mammosomatotroph adenoma
Mixed somatotroph and lactotroph adenoma
Adrenocorticotropic hormone Corticotroph adenoma (CA) Sparsely granulated CA
Densely granulated CA
Acidophilic stem cell adenoma
Thyroid-stimulating hormone Thyrotroph adenoma
Luteinizing hormone/follicular-stimulating hormone Gonadotroph adenoma (GA) null cell adenoma Sparsely granulated GA
Plurihormonal Plurihormonal adenoma Plurihormonal PIT1-positive adenoma
Adenomas with unusual IHC combinations
Double adenoma Distinct adenomas

WHO, World Health Organization; PIT1, pituitary-specific positive transcription factor 1; IHC, immunohistochemical.

a Adapted from Laws et al. [10], with permission from Springer Nature.

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