N Salakos’s research while affiliated with National and Kapodistrian University of Athens and other places

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Publications (74)


FGF21 values (pg/mL), box and whisker plots indicate box limits: Q1 and Q3, lines within the boxes: median value, diamond symbol: mean value, whisker limits: minimum and maximum observation after outlier exclusion.
Insulin values (pmol/L), box and whisker plots indicate box limits: Q1 and Q3, lines within the boxes: median value, diamond symbol: mean value, whisker limits: minimum and maximum observation after outlier exclusion.
Maternal and fetal characteristics of the studied groups (SGA, LGA, and AGA) (values presented as median and Q1-Q3 range and for categorical data as number of cases and percentage).
FGF21 median values (pg/mL) and Q1-Q3 ranges by fetal size subgroups, including ex- tremes of distribution.
Insulin median values (pmol/L) and Q1-Q3 ranges by fetal size subgroups, including ex- tremes of distribution.

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Increased Fibroblast Growth Factor 21 (FGF21) Concentration in Early Second Trimester Amniotic Fluid and Its Association with Fetal Growth
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  • Full-text available

August 2021

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84 Reads

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6 Citations

Nikolaos Vrachnis

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Altered fetal growth, either reduced or exacerbated, is associated with adverse perinatal outcomes. The underlying pathogenetic mechanisms of altered growth remain unclear. Fibroblast growth factor 21 (FGF21) and insulin are both considered to be major regulators of tissue growth and metabolism. The aim of our study was to investigate the association of second trimester amniotic fluid FGF21 and insulin concentrations with fetal growth. The amniotic fluid concentrations of FGF21 and insulin were determined in 80 cases of different fetal growth patterns (SGA—small for gestational age, LGA—large for gestational age, and AGA—appropriate for gestational age fetuses). Both peptides were found to be increased in cases of abnormal fetal growth, reduced growth velocity (SGA), or macrosomia (LGA). Specifically, FGF21 was significantly increased, as higher FGF21 levels were observed in the amniotic fluid of SGA and LGA fetuses compared with AGA fetuses (p < 0.05). Furthermore, the more severe the fetal smallness, the higher the FGF21 levels (p < 0.05). Similarly, higher insulin levels were noted in the amniotic fluid of SGA and LGA fetuses compared with those in AGA fetuses, though this was not statistically significant (p > 0.05). Again, the more severe the reduced fetal growth, the higher the insulin levels.

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Demographic, clinical and hormonal characteristics of patients with premature ovarian insufficiency and those of early menopause: data from two tertiary premature ovarian insufficiency centers in Greece

March 2020

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57 Reads

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11 Citations

The aim of the study was to compare demographic, hormonal and clinical parameters in patients with premature ovarian insufficiency (POI) and women with early menopause in Greece. One hundred thirty-nine women of Greek origin, aged 14–45 years, referring for oligomenorrhea and having elevated FSH concentrations were divided into three groups regarding the age of menstrual disturbances onset [POI1: </=30 years (n = 42); POI2: 31–39 years (n = 36); early menopause: 40–45 years (n = 61)]. The mean age of menstrual disturbances onset and that of diagnosis in all POI and early menopause patients were 28.7 years (28.7 ± 7.7) versus 42.1 years (42.1 ± 1.5) and 33.8 years (33.8 ± 7.2) versus 43.3 years (43.3 ± 1.4), respectively. POI patients and women with early menopause were diagnosed, respectively, five years and approximately four to six months later than the age of menstrual disturbances onset. Moreover, FSH2 (second confirmatory FSH measurement at 4-to-6-weeks interval) was greater in all POI patients than in early menopause women (55.4 ± 33.9 vs. 32.4 ± 19.4; p < .05) whereas mean age of menarche was greater in early menopause women than in POI patients (13 ± 1.3 vs. 12 ± 2.2; p < .05). Furthermore, FSH2 was increased in all POI and decreased in early menopause patients.


Figure 1. Positive association of amniotic fluid resistin concentration with advancing gestational age in mid-pregnancy (Linear regression model: Y=0.35X-3.07, b=0.35, 95%CI=0.18-0.52, p<0.001). Figure 2. Scatter-plot diagram of resistin concentration (ng/ml) in fetuses with trisomies 13 and 18 and normal fetuses.
Figure 3. Boxplot diagram of the distribution of resistin levels (ng/ml) according to the presence of trisomy 13 or 18 or euploidy.
Altered Resistin Concentrations in Mid-trimester Amniotic Fluid of Fetuses With Trisomies 18 and 13: A Window onto the Pathophysiology of Trisomies 18 and 13

March 2019

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105 Reads

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2 Citations

In vivo (Athens, Greece)

Background/aim: The study aimed to examine whether resistin is present in second trimester amniotic fluid from pregnancies with trisomy 18 and 13 and evaluate its concentration in comparison with euploid pregnancies. Patients and methods: The study included 37 women who underwent amniocentesis. Eleven fetuses had trisomy 18, 3 had trisomy 13, while 23 had a normal karyotype. Results: Resistin was detected in all cases. The mean level of resistin in trisomy 18 was statistically significantly lower compared to euploid controls. Resistin levels in all abnormal cases were below its median concentration in euploid controls. ROC analysis showed very good prognostic value for both trisomies. Conclusion: Resistin is a constituent of mid-trimester amniotic fluid of pregnancies with trisomies 13 and 18, exhibiting lower levels than those in euploid fetuses. The reduced levels of resistin in amniotic fluid may be associated with early changes in metabolic pathways and immunoinflammatory responses.


BDNF mean values (pg/ml) and 95% confidence intervals: comparison between groups (1 = SGA, 2 = AGA, 3 = LGA).
Regression analysis line graph of variables, BDNF (pg/ml) and fetal growth centile: a bimodal depiction of BDNF amniotic fluid levels is shown.
Association between Brain-Derived Neurotrophic Factor (BDNF) Levels in 2 nd Trimester Amniotic Fluid and Fetal Development

December 2018

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167 Reads

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32 Citations

The development of the fetal nervous system mirrors general fetal development, comprising a combination of genetic resources and effects of the intrauterine environment. Our aim was to assess the 2 nd trimester amniotic fluid levels of brain-derived neurotrophic factor (BDNF) and to investigate its association with fetal growth. In accordance with our study design, samples of amniotic fluid were collected from women who had undergone amniocentesis early in the 2 nd trimester. All pregnancies were followed up until delivery and fetal growth patterns and birth weights were recorded, following which pregnancies were divided into three groups based on fetal weight: (1) AGA (appropriate for gestational age), (2) SGA (small for gestational age), and (3) LGA (large for gestational age). We focused on these three groups representing a reflection of the intrauterine growth spectrum. Our results revealed the presence of notably higher BDNF levels in the amniotic fluid of impaired growth fetuses by comparison with those of normal growth. Both SGA and macrosomic fetuses are characterized by notably higher amniotic fluid levels of BDNF (mean values of 36,300 pg/ml and 35,700 pg/ml, respectively) compared to normal-growth fetuses (mean value of 32,700 pg/ml). Though apparently small, this difference is, nevertheless, statistically significant ( p value < 0.05) in SGA fetuses in the extremes of the distribution, i.e., below the 3rd centile. In conclusion, there is clear evidence that severe impairment of fetal growth induces the increased production of fetal brain growth factor as an adaptive mechanism in reaction to a hostile intrauterine environment, thereby accelerating fetal brain development and maturation.



TRANSLATION AND VALIDATION OF THE PERINATAL GRIEF SCALE IN A SAMPLE OF GREEK WOMEN WITH PERINATAL LOSS DURING THE 1(ST) AND 2(ND) TRIMESTER OF PREGNANCY

December 2016

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85 Reads

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6 Citations

Objective: To translate and validate the Perinatal Grief Scale (short version) in a sample of Greek women with perinatal loss during the 1(st) and 2(nd) trimester of pregnancy. Method: One hundred seventy-six women were approached a few hours after the loss. Along with the Perinatal Grief Scale (PGS), three more questionnaires were completed: the Edinburgh Postnatal Depression Scale (EPDS), the Hospital Anxiety and Depression Scale (HADS), the State-Trait Anxiety and Inventory (STAI), in order to assess the convergent validity of the PGS. Results: Total sample mean age was 34.1 years (SD = 5.2). Mean values and Cronbach's alpha coefficients for PGS subscales exceeded the minimum reliability standard of 0.70. Mean score for "Active grief" was 31.47 (SD = 9.31), for "Difficulty Coping" was 23.13 (SD = 7.54) and for "Despair" was 21.07 (SD = 7.07). By applying Pearson's correlation coefficients, PGS subscales positively correlated with scores on EPDS, STAI and HADS. Conclusion: The PGS Greek version is a reliable instrument in terms of internal consistency and the Cronbach's alpha coefficients are high. The Greek version of PGS can be a useful instrument for the detection of the psychological impact after a perinatal loss and it has implications for both scientific research and clinical routine.


Rapidly progressive primary undifferentiated ovarian carcinoma: Presentation of a rare case

January 2016

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39 Reads

European Journal of Gynaecological Oncology

Ovarian cancer is the second most common gynecologic malignancy and is one of the leading causes of death among women. The disease course and the accurate diagnosis are correlated with the early detection of the lesion. About 5% of ovarian cancers are poorly differentiated and difficult to be classified, and are referred to as undifferentiated carcinomas. They are usually large, solid with haemorrhage and necrosis, bilateral, and very difficult to be histologically classified. Generally, cases with undifferentiated components are very rare. The authors present a case of a young female patient with a rapidly progressive undifferentiated ovarian carcinoma and a final unfortunate clinical result.


Trocar metastases in laparoscopic approach for gynecologic malignancies. A short review of the literature

January 2016

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45 Reads

European Journal of Gynaecological Oncology

Introduction: Compared to laparotomy, laparoscopy has many benefits for patients, such as shorter recovery and lower morbidity rates. Port site metastases after laparoscopic approach in the treatment of gynecologic malignancies are uncommon. The purpose of this review is to identify and summarize possible risk factors for port-site metastases in patients undergoing laparoscopic surgery in the ambit of gynecologic oncology. Discussion: The precise incidence of port-site metastases is not well known because many patients are not followed-up during the whole postoperative period. Possible risk factors that can increase the risk of port-site metastases can be the presence of large masses in the abdomen, especially in the presence of concomitant ascites and in patients treated for ovarian carcinomas. Different theories have been postulated in order to explain the development of port site metastases during laparoscopy for oncological patients. Conclusions: Patient selection is an essential factor that can influence the incidence of port site metastases in gynecological patients. Robust data regarding port site metastases in gynecologic oncology are needed.


Skin metastases of vulvar squamous cell carcinoma. Presentation of a rare case

January 2016

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51 Reads

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1 Citation

European Journal of Gynaecological Oncology

Skin metastases secondary to vulvar carcinoma is an infrequent clinical entity. The authors describe a case of squamous vulvar carcinoma, which presented with cutaneous involvement as a part of distant spread. After a radical vulvectomy, bilateral inguino-femoral lymphadenectomy, and adjuvant radiotherapy, the patient developed multiple cutaneous metastases in lower extremities. This case was unique in presentation, with skin metastases secondary from vulvar carcinoma, and indicated advance disease and poor prognosis.


Influence of non-steroidal aromatase inhibitors in the lipid profile of an animal experimental model.

October 2015

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17 Reads

International Journal of Gynecological Cancer

Introduction: Anastrazole and Letrozole are used as endocrine therapy for breast cancer patients. Previous studies suggested a possible associationwith metabolic and liver adverse effects. Their results are conflicting. Materials and methods: Fifty-five 4-week-old female Wistar rats were were maintained in weather controlled chambers (temperature 20±1 oC, humidity 55± 5%) under controlled lightning (12 hours light per day) for 30 days in order to adapt to their new environment. After that were allocated in 4 groups 1) ovariectomy control (OC), 2) ovariectomy - Anastrazole (OA) 3) ovariectomy -Letrozole (OL), 4) control. Serum glucose, cholesterol, triglycerides, HDL-c and LDL-c were measured at baseline, 2and 4 months. Results: At 4 months, total cholesterol differed among the OC and OL groups (p=.005) and the control and OL groups (p=.011). HDL-C differed between the OC and OL groups (p=.003) as well as between the OA and OL groups (p=.014). OC group triglycerides, differed from those of the OL group (p=.005) and the control group (p=.008). Similar results were observed in the case of OA group (p=.039 when compared to OL group and p=.078 when compared to control group). Conclusion: Anastrazole and Letrozole seem to negatively influence the lipid profile in our experimental model. This information should be taken in caution by medical oncologists when addressing patients with altered lipid metabolism.


Citations (51)


... 124 Moreover, fibroblast growth factors-21 (FGF-21) and FGF-23 are involved in metabolic processes and have been linked to altered placental function. 125 Ficolin-3, a protein involved in the innate immune response, has also been linked to the development of preeclampsia. In preeclamptic patients, plasma ficolin-2 and ficolin-3 levels were significantly lower compared to healthy pregnant (ficolin-2: 3.1 µg/mL, ficolin-3: 17.6 µg/mL) and nonpregnant women (ficolin-2: 3.7 µg/mL, ficolin-3: 18.2 µg/mL). ...

Reference:

Biomarkers of Gestational Diabetes Mellitus: Mechanisms, Advances, and Clinical Utility
Increased Fibroblast Growth Factor 21 (FGF21) Concentration in Early Second Trimester Amniotic Fluid and Its Association with Fetal Growth

... Con respecto al concepto de menopausia precoz o prematura es importante hacer su distinción con la denominada menopausia temprana ya que es la menopausia precoz la que está relacionada con la Insuficiencia ovárica prematura presentándose antes de los 40 años de edad y la menopausia temprana es la que ocurre entre los 40 y 45 años de edad [5] y según datos proporcionados por el consorcio de Inter LACE (The International collaboration on the life course Approach to reproductive health and Chronic disease Events) la prevalencia de menopausia prematura en población femenina de países de altos ingresos es del 2% ( rango de 1-3%) y de menopausia temprana es de 7.6% (rango del 5-10%), lo que sugiere que un poco más del 10% [6] o una de cada 10 mujeres presentan menopausia prematura o temprana [7]. Otros estudios señalan que la prevalencia de la IOP es del 1% en mujeres a la edad de 40 años, 0.1% a los 30 años y del 0.01% a los 20 años [8][9][10]. ...

Demographic, clinical and hormonal characteristics of patients with premature ovarian insufficiency and those of early menopause: data from two tertiary premature ovarian insufficiency centers in Greece
  • Citing Article
  • March 2020

... T13 and T18 are the most frequently autosom aberrations, excluding T21, where the pathogenesis of this chromosom largely known, and numerous studies have been conducted [5,7,[27][28][29]. changes related to T13 and T18 may also be associated with oxidative portant causative genes being primarily involved in the redox balance re prehensive studies concerning the evaluation of the trisomies' pathomecha plain the development of some malformations and the importance of o which can lead to a better understanding of the effects of the occurrence of [4,30,31]. Consequently, a literature review was undertaken to provide nov trisomy 13 and 18 pathogeneses, with a particular emphasis on the effec stress. We highlight that this study may not meet the standards of a conv ture review. ...

Altered Resistin Concentrations in Mid-trimester Amniotic Fluid of Fetuses With Trisomies 18 and 13: A Window onto the Pathophysiology of Trisomies 18 and 13

In vivo (Athens, Greece)

... In this exploratory study, we found that fetal developmental biomarkers relate to MEG power-spectral-density parameters reflecting fetal brain development. We found that maternal BDNF levels negatively correlate with RP in the delta band, and positively correlate with RP in the rest of the bands, which is consistent with the notion that maternal BDNF supports fetal neurological development (Antonakopoulos et al., 2018;Kodomari et al., 2009) and is reflected by a shift away from the delta band toward higher frequencies (Eswaran et al., 2012; Scher et al., ...

Association between Brain-Derived Neurotrophic Factor (BDNF) Levels in 2 nd Trimester Amniotic Fluid and Fetal Development

... [15] It was further modified to the short version of PGS by Potvin et al. [16] Since then, it has been modified and translated into various languages and validated in many countries. [17][18][19][20][21] However, the scale has not been translated and validated in Hindi. Accordingly, we aimed to translate and adapt the PGS into Hindi and evaluate its psychometric properties in a sample of women who had recently experienced a stillbirth. ...

TRANSLATION AND VALIDATION OF THE PERINATAL GRIEF SCALE IN A SAMPLE OF GREEK WOMEN WITH PERINATAL LOSS DURING THE 1(ST) AND 2(ND) TRIMESTER OF PREGNANCY
  • Citing Article
  • December 2016

... After evaluation of the pertinent manuscripts we found 14 articles reporting cases of cutaneous metastasis from SCC of the vulva plus our two unpublished cases. One of them was published in French language (Rachadi and Ramli 2015), while 13 cases have been published in English language (Cianfran and Smith 1956;Santala et al. 1989;Kulkarni and Bradford 1995;Tobias et al. 1995;Dudley et al. 1998;Tjalma and Watty 2003;Ceydeli et al. 2003;Ghaemmaghami et al. 2004;Wang et al. 2010;Arunachalam et al. 2012;Hau et al. 2012;Sofoudis et al. 2016;Tokgozoglu et al. 2016) (Table 1). The median age of the women at the first diagnosis of vulvar cancer was 68.0 years (range 38–79). ...

Skin metastases of vulvar squamous cell carcinoma. Presentation of a rare case
  • Citing Article
  • January 2016

European Journal of Gynaecological Oncology

... Эндометриоз может приводить к воспалению органов малого таза, спаечному процессу, хронической боли и бесплодию, а также может прогрессировать до биологически злокачественных опухолей [16; 17]. Что касается злокачественных опухолей, существуют немногочисленные опубликованные исследования о связях между эндометриозом и раком яичников [18; 19], раком молочной железы [20], раком эндометрия [21], колоректальным раком [22]. Имеющиеся на сегодняшний день данные подтверждают, что женщины с эндометриозом могут иметь повышенный риск некоторых хронических заболеваний и определенных злокачественных новообразований [23]. ...

Association of endometriosis and breast cancer: Mini review of the literature
  • Citing Article
  • July 2015

Archives of Gynecology and Obstetrics

... mTOR is downstream of PI3K/AkT which can induce the expression of HIF-1α and LDHA to mediate glycolysis in tumors. Futhermore, in precancerous lesions of cervical lesions, mTOR signaling pathway is activated [47]. Interestingly, upregulation of miRNA-34a can induce gastric cancer cell death via modulating PI3K/AKT pathway [19]. ...

The role of mTOR signaling pathway in premalignant and malignant cervical lesions
  • Citing Article
  • April 2015

European Journal of Gynaecological Oncology

... Treatment and hospitalization expenses in Greece are fully covered by the patients' social health insurance provider which differs according to their profession. As far as our dedicated oncology center is concerned, numerous complaints by patients regarding the compromise of their healthcare appeared on the media, during the recent economic crisis [10]. They mostly reported delays and unavailability of treatment, shortages of medication and barriers to their access to the hospital. ...

Cancer mortality in Greece during the financial crisis
  • Citing Article
  • September 2014

Acta oncologica (Stockholm, Sweden)

... A diferencia de otros tipos de cáncer epitelial de ovario, el CCE primario tiene características localmente invasivas similares a las que producen en otros sitios anatómicos. Sin embargo, debido a que el CCE primario puro se considera cáncer de ovario epitelial, se debe sugerir el tratamiento estándar para estos casos que incluye cirugía de estadificación completa con cito-reducción de volumen máxima seguida de quimioterapia adyuvante (9,11) . ...

A rare case report of Squamous-Cell carcinoma arising from mature cystic teratoma of ovary
  • Citing Article
  • September 2014

Il Giornale di Chirurgia - Journal of Surgery