Trudności w diagnostyce zespołu policystycznych jajników u młodzieży – badanie pilotażowe

Introduction

Polycystic ovary syndrome (PCOS) is a heterogeneous endocrine disorder that concerns 6-15% women of reproductive age [1]. It accounts for 72-84% of adult hyperandrogenism [1], but the development of PCOS usually begins during puberty. The complexity of the pathophysiology of PCOS is associated with interactions between genetic and environmental factors, which may vary in affected individuals.
The diagnosis of PCOS in adult women is based on the clinical and biochemical characteristics, known as the Rotterdam crite-ria, accepted by the European Society of Human Reproduction and Embryology and the American Society for Reproductive Medicine (ESHRE/ASRM 2004, 2012) [2]. They include hyperandrogenism, menstrual irregularity, and/or polycystic ovary morphology (PCOM) on ultrasound (should have either ≥ 12 follicles measuring 2–9 mm in diameter or an increased ovarian volume of > 10 ml using transabdominal visualisation) [3]. Nevertheless, the diagnosis of PCOS in adolescence may be difficult considering the possible physiological menstrual irregularity for two years after menarche and common PCOM-like features in healthy girls [4].
The overlap between normal pubertal development and characteristics of PCOS may confound an accurate diagnosis of PCOS among adolescent girls. On the other hand, ovarian androgenic function in adolescents may have a prognostic value indicating higher risk of PCOS in the future [5].
Concurrently, the diagnostic label of PCOS to an adolescent may be problematic and may result in unnecessary treatment and impose psychological distress, which by itself may be associated with several concerns including those of body image and concerns over future fertility [6]. Lack of unification of diagnostic criteria for PCOS in adolescents can make it difficult to analyse data from lit-erature. There is no agreement concerning how to diagnose PCOS in adolescence, or whether such a diagnosis should be made before the age of 18 years [6, 7]. The majority of authors propose diagnosing PCOS in girls who fulfil all Rotterdam criteria [7–9].
The aim of the study was an analysis of the frequency of PCOS according to Rotterdam criteria in adolescents referred to our clinic for diagnostics.

Material and methods

Data were obtained from the records of 36 girls, hospitalised in the Department of Paediatrics and Endocrinology in the period be-tween June 2015 and July 2017, who were referred to paediatric endocrinologist because of menstrual disorders or/and symptoms of hyperandrogenism. Data were evaluated retrospectively. We conducted an analysis of patients with initial diagnosis that indicated suspi-cion of PCOS: oligomenorrhoea or secondary amenorrhoea, hirsutism, and/or acne. Oligomenorrhoea was defined as cycles that last longer than 35 days or occur less than eight times a year, and secondary amenorrhoea was recognised in the absence of menstruation for more than three months [1]. Both disorders were diagnosed at least two years post-menarche. Patients with adrenal hyperandrogenism and anorexia nervosa were excluded from the study group.
For further analysis 26 patients were enrolled, in whom ovarian hyperandrogenism was suspected. In enrolled patients, medical history was analysed, clinical examination and transabdominal pelvic ultrasound was performed, and testosterone concentration was assessed. The serum concentration of total testosterone was measured by Chemiluminescence Immunoassay (CLIA) using the Architect i1000SR system (Abbott, Germany). Subsequent assessment of ovarian hyperandrogenaemia was performed according to the latest recommendations of American Academy of Paediatrics (AAP 2015) as an elevation of serum testosterone > 55 ng/dl [10] and according to the study by Gambinieri et al. [11] recognising a total testosterone cut-off point above 42 ng/dl. A Philips TISO.6 MI 1.2 ultrasound was used to assess ovarian morphology. Ovarian volume > 10 ml was recognised as PCOM [12]. Statistical analysis was performed to determine the clinical profile of young patients referred to an endocrinologist with menstrual disorders and hyperandrogenism. Statistical analysis of mean, standard deviation, and Spearman correlation was carried out using Statistica 13.1 and Microsoft Office Excel 2013 software.

Results

Presence of biochemical and ultrasound characteristics

The mean age of the enrolled patients was 17.04 ±1.28 years (range 13.75–18 years old). The study group was divided into three subgroups according to their symptoms: with isolated cutaneous manifestation (CM) of hyperandrogenism (n = 6), with isolated men-strual disorders (MD; n = 10), and with simultaneous cutaneous manifestation and menstrual disorders (CMMD; n = 10).
In those three groups we compared total testosterone levels and occurrence of PCOM. Each group was analysed by two cut-off points: > 42 ng/dl and > 55 ng/dl.
The mean ovarian volume in the study group was 12.2 ±4.76 ml (median 11.1 ml; range 5.3–23.9 ml). Enlarged ovaries >10 ml (range: 11–23.9 ml) were detected in 54% (14/26) of girls from the whole group. The highest proportion of patients with PCOM was in the MD group (70%; 7/10). Similarly, in the CMMD group 60% of patients had PCOM (6/10). In CM girls the contribution of PCOM was the lowest and was found only in one patient (n = 17%).
In enrolled patients mean T concentration was 57.85 ng/dl ±19.65 (median 56 ng/dl; range: 29–128 ng/dl). According to Gam-binieri criteria [11], in the whole group hyperandrogenaemia was confirmed in 81% (21/26) of patients: 83% in the CM group, 70% in the MD group, and 90% in the CMMD group.
Using more restricted criteria proposed by AAP, only 54% (14/26) of all patients had biochemical hyperandrogenism. Hyper-androgenaemia was confirmed in 33% (2/6) of patients in the CM group, in 50% (5/10) of the MD group, and in 70% (7/10) of the CMMD group (Table I).

Diagnosis of PCOS

The presence of at least two of the Rotterdam criteria was found in 77% (20/26) of patients in the whole group. The presence of all Rotterdam criteria using adult cut-off point (> 55 ng/dl) applied to only seven patients, which accounted for 27% of patients. When a lower cut-off point was used (> 42 ng/dl), almost 38% (10/26) of patients had PCOS (Table II).

Correlations

We did not find any correlation between testosterone concentration and ovarian volume (p = 0.695; Rs = 0.08) (Fig. 1).

Discussion

Since 1990 a high dynamism of the evolution of views on PCOS diagnostics has been observed. Every year brings new sugges-tions for the diagnostic criteria in young women, but still there are no clear guidelines. The diagnostic path of PCOS during adolescence remains open.
The recent recommendations [13] of the International Consortium of Paediatric Endocrinology (ICPE), aiming to improve worldwide care of adolescent girls with PCOS, and the Clinical Practice Committee for the diagnosis of PCOS in adolescents [14] presented the consensus of paediatric endocrine, obstetrics, and gynaecology, and adolescent medicine experts representing professional organisations dedicated to the care of adolescents and young women with androgen excess. They proposed guidelines based on a literature review and evidence graduation to address a series of questions regarding the diagnosis of PCOS in this age group. Howev-er, there is still no answer to the question of what criteria should be used to unambiguously diagnose PCOS in girls. Suggested criteria for the PCOS diagnosis in adolescence are divided into the following three groups [13]: 1) required: irregular menses/oligomenorrhoea; evidence of hyperandrogenism (biochemical, clinical); 2) optional: PCOM, severe cystic acne; 3) not recommended: obesity, insulin resistance, hyperinsulinaemia, biomarkers (AMH, testosterone-to-dihydrotestosterone T/DTH ratio), acanthosis nigricans. Moreover, girls must generally be two years post-menarche, and other disorders with androgen excess must be ruled out. There is a recommendation to recognise menstrual irregularity after two years of persistent oligomenorrhoea (cycle duration > 45 days), when total and/or free testosterone concentrations and FAI (free androgen index) are elevated. The menstrual irregularities represent ovarian manifestation of hyperandrogenaemia. Approximately half of the girls with menstrual disorders without other symptoms of hyperandro-genism have elevated androgen levels [15]. This result is consistent with our findings – in the group with MD and cut-off point > 55 ng/dl, hyperandrogenaemia was detected in 50% of patients. Nevertheless, the recent AAP guideline emphasise that the cycles shorter than 19 days or longer than 90 days are abnormal at any stage and should be investigated [10]. Hirsutism, which is the most common symptom of hyperandrogenaemia, may occur with no hormonal abnormalities in adolescents [16, 17]. Also, in our study the majority of patients with isolated hirsutism and/or acne had no hormonal abnormalities. Hyperandrogenism is the most constant and prominent diagnostic feature of PCOS. Clinically it is diagnosed by mostly subjective assessment of cutaneous manifestations of excessive androgen activity: hirsutism, acne, and alopecia. Moderate-severe hirsutism is considered as a clinical evidence of hyperandrogenism, usually due to hy-perandrogenaemia [10]. Also, moderate and severe inflammatory acne that is persistent and resistant to topical dermatological therapy should be assessed for hyperandrogenaemia before being treated by combined oral contraceptives (COC). It is possible that acne may be the only pilosebaceous manifestation of hyperandrogenaemia [18]. In the study by Hickey [9] only 18.5% of 244 girls met the Rotter-dam criteria for adult women; nevertheless, the authors claim that not all of them had PCOS. In their opinion, symptoms like menstrual disorders, acne, and hirsutism should not be used for the diagnosis of PCOS in adolescents due to their great similarity to those seen in physiological puberty. In our study 30% of patients suspected of PCOS met all Rotterdam criteria for the diagnosis. This difference in results is caused by a much smaller number of enrolled patients in our study and more restricted criteria in the Hickey study [9]. Accord-ing to our results, the majority of adolescents probably first report to a gynaecologist with menstrual disorders and they are rarely re-ferred for hormonal diagnostics.
Hyperandrogenaemia should be confirmed by measurement of plasma levels of the total and free testosterone and sex hormone binding globulin (SHBG) [1, 2, 14, 19]. According to Carmina et al. [7], all Rotterdam criteria should be met to diagnose PCOS in ado-lescents. Applying this diagnostic path, another question arises: which cut-off point for total testosterone serum concentration should be used? The Clinical Practice Committee suggest that for an assay using an extraction step, total testosterone concentration > 55 ng/dl is probably consistent with hyperandrogenism [14]. Simultaneously, they highlighted methodological problems regarding testosterone determinations, which include: insufficient assay sensitivity for low testosterone concentration and assay interference with other steroid molecules, lack of well-defined normative values, and binding testosterone with SHBG. The comparative study by Haring et al. showed that the CLIA platform gave a reasonable measurement error and yielded comparable risk associations, providing little support to meas-ure TT concentrations in men from the general population exclusively by LC–MS/MS [7, 14, 20, 21]. Hickey et al. [9] noted that there is no internationally agreed normal range for free testosterone or FAI. Gambineri et al., in their study of 519 girls, defined hyperandro-genism as total testosterone concentration > 42 ng/dl using LC-MS/MS assay. In their study only 4% of patients could be diagnosed with PCOS. Most of the study group (17%) presented with isolated clinical features of hyperandrogenism (mainly hirsutism), 10% had isolated menstrual irregularities, and only 7% had hyperandrogenaemia in laboratory tests [11]. In our study the frequency of hyper-androgenaemia at a testosterone concentration above 42 ng/dl appears to be vetted. It seems that the more appropriate diagnostic criterion for adolescents is testosterone serum concentration >55 ng/dl, as used in adults.
The most recent global update [13] on adolescent PCOS summarised that most recommendations advocate utilisation of high-quality liquid chromatography/tandem mass spectrometry (LC-MS/MS) to measure testosterone concentration. Until the LC-MS/MS technology is universally available, high-quality RIA (radioimmunoassay) with extraction and chromatography should be used. Also, they emphasised that due to variability in the results of testosterone assays and limited data on the normal development fluctuations in testosterone levels during adolescence, no clear cut-off points can be established. Available guidelines suggest that total testosterone concentrations > 55 ng/dl (1.91 nmol/l) are probably consistent with hyperandrogenism [13].
PCOM is a common image of ovaries during puberty, and in asymptomatic girls it should not be considered as evidence for PCOS. According to research studies of Dewailly et al. (2014), PCOM could be found in 30% of normal young women [12, 22]. Also, in the study conducted by Codner et al. PCOM was found in 40% of healthy girls two years post-menarche, in 35% three years post-menarche, and in 33.3% four years post-menarche without the occurrence of abnormal ovulation or metabolic disorders associated with PCOS [4]. Ovarian volume > 10 cm3, according to Rotterdam criteria, in abdominal ultrasonography during adolescence is a more relia-ble parameter of PCOM than the follicle count [2]. Ibaniez et al. recommend not using follicle counts to establish PCOM in adolescents. They suggest considering enlarged ovaries with the volume above 12 cm3 until further investigation is conducted [13]. Nonetheless, transabdominal ultrasound (TA USG) is a subjective evaluation depended on the investigator’s experience. In adolescents TA USG is not very precise, and as a PCOS criterion it may be unnecessary [13]. Hickey et al. concurred that ultrasound imaging caused overdiag-nosis of the syndrome in their study [9].

Conclusions

In our study only 27% of patients suspected of PCOS met all Rotterdam criteria for the diagnosis. Co-occurrence of menstrual dis-orders and hirsutism increases the probability of hyperandrogenaemia. According to our data, PCOM does not have great value for ado-lescent PCOS diagnostics.

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