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  1. Book ; Thesis: Skeletal effects of androgen deficiency, androgen replacement and androgen resistance

    Vanderschueren, Dirk

    1994  

    Author's details D. Vanderschueren
    Language German
    Size 90 S. : graph. Darst.
    Publishing country Belgium
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Leuven, Univ., Habil.-Schr., 1994
    HBZ-ID HT008497036
    Database Catalogue ZB MED Medicine, Health

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  2. Book: Osteoporosis in men

    Orwoll, Eric S. / Bilezikian, John P. / Vanderschueren, Dirk

    the effects of gender on skeletal health

    2010  

    Author's details Eric S. Orwoll ; John P. Bilezikian ; Dirk Vanderschueren
    Keywords Osteoporosis ; Men ; Sex Factors ; Risk Factors ; Bone and Bones / physiology
    Language English
    Size XV, 741 S., [3] Bl. : Ill., graph. Darst.
    Edition [2. ed.]
    Publisher Elsevier Acad. Press
    Publishing place Amsterdam u.a.
    Publishing country Netherlands
    Document type Book
    HBZ-ID HT016168744
    ISBN 978-0-12-374602-3 ; 0-12-374602-7
    Database Catalogue ZB MED Medicine, Health

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  3. Article ; Online: The effect of testosterone treatment on bone mineral density in Klinefelter syndrome: A retrospective cohort study.

    Willems, Stien / David, Karel / Decallonne, Brigitte / Marcq, Philippe / Antonio, Leen / Vanderschueren, Dirk

    Andrology

    2023  Volume 11, Issue 7, Page(s) 1295–1302

    Abstract: Background: Although Klinefelter syndrome (KS) is the most frequent sex-hormone disorder, there is ongoing uncertainty about the often associated sex-hormone deficiency, its impact on common comorbidities, and therefore about prevention and treatment. ... ...

    Abstract Background: Although Klinefelter syndrome (KS) is the most frequent sex-hormone disorder, there is ongoing uncertainty about the often associated sex-hormone deficiency, its impact on common comorbidities, and therefore about prevention and treatment. In this study, we focus on bone loss, reported to occur in over 40% of KS patients, and the impact of testosterone replacement therapy (TRT) on this comorbidity.
    Objectives: This single-center retrospective cohort study in a tertiary hospital compared the effect of treatment with TRT to no TRT on evolution of bone mineral density (BMD) in KS patients.
    Methods: After a medical chart review, a total of 52 KS subjects were included in this study. BMD was measured by dual-energy X-ray absorptiometry (DXA) and expressed as T-scores.
    Results: The subjects were divided into three groups, according to TRT. In the subgroup that only started TRT after baseline measurements (mean age 31 years), we observed significant gain in BMD T-score at the lumbar spine (0.58 ± 0.60, p = 0.003; mean gain of 0.62% areal BMD per year) and total femur T-score (0.24 ± 0.39, p = 0.041; mean gain of 0.25% areal BMD per year) after a mean follow-up period of 7.5 years. Compared to untreated subjects, a significant difference in evolution was demonstrated at the lumbar level (+0.58 ± 0.60 vs. -0.14 ± 0.42, p = 0.007). In untreated subjects with normal testosterone levels, a loss of BMD (-0.27 ± 0.37, p = 0.029; mean loss of 0.49% areal BMD per year) at the femoral neck was measured. This decline was equal to the predicted loss seen in the general male population.
    Conclusion: TRT results in BMD gain in patients with KS with testosterone deficiency, mainly at the lumbar spine. However, this effect is limited (0.62% per year). Patients who were not treated with TRT because of sufficient endogenous testosterone levels, showed only the predicted age-related bone loss during follow-up. The need for TRT in maintaining bone health in KS should be evaluated on an individual basis according to the degree of sex steroid deficiency.
    MeSH term(s) Humans ; Male ; Adult ; Bone Density ; Testosterone/therapeutic use ; Testosterone/pharmacology ; Klinefelter Syndrome/complications ; Klinefelter Syndrome/drug therapy ; Retrospective Studies ; Osteoporosis/prevention & control ; Absorptiometry, Photon/adverse effects ; Absorptiometry, Photon/methods ; Gonadal Steroid Hormones
    Chemical Substances Testosterone (3XMK78S47O) ; Gonadal Steroid Hormones
    Language English
    Publishing date 2023-02-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2696108-8
    ISSN 2047-2927 ; 2047-2919
    ISSN (online) 2047-2927
    ISSN 2047-2919
    DOI 10.1111/andr.13411
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Effects of treatment for diabetes mellitus on testosterone concentrations: A systematic review.

    Van Cauwenberghe, Jolijn / De Block, Christophe / Vanderschueren, Dirk / Antonio, Leen

    Andrology

    2022  Volume 11, Issue 2, Page(s) 225–233

    Abstract: Background: Low testosterone levels are frequently present in men with obesity and insulin resistance. Currently available treatment options (testosterone replacement therapy or lifestyle changes) hold possible risks or are insufficient. Since low ... ...

    Abstract Background: Low testosterone levels are frequently present in men with obesity and insulin resistance. Currently available treatment options (testosterone replacement therapy or lifestyle changes) hold possible risks or are insufficient. Since low testosterone levels are closely related to obesity and type 2 diabetes, treatment modalities for these conditions could result into improvement of testosterone levels.
    Objectives: To summarize the available evidence on the effects of traditional and recent treatment modalities for diabetes mellitus on testosterone levels and androgen-deficiency-related signs and symptoms.
    Materials and methods: PubMed was searched from the year 2000 till present using MESH terms: "hypogonadism," "testosterone," "testosterone deficiency," "functional hypogonadism," and the different classes of medications. Studies with observational and experimental designs on humans that evaluated the effect of antidiabetic medications on gonadotropins and testosterone were eligible for inclusion.
    Results: Current available data show no or only limited improvement on testosterone levels with the classic antidiabetic drugs. Studies with GLP1-receptor analogues show beneficial effects on both body weight and testosterone levels in men with low testosterone levels and obesity with or without type 2 diabetes. However, data are limited to small and heterogeneous study groups and only few studies report data about impact on androgen-deficiency-related signs and symptoms.
    Discussion and conclusion: With the recent advances in the knowledge of the pathophysiological pathways in obesity, there is an enormous progress in the development of medications for obesity and type 2 diabetes. Newer incretin-based agents have a great potential for the treatment of functional hypogonadism due to obesity since they show promising weight reducing results. However, before the use of GLP1-receptor analogues can be suggested to treat functional hypogonadism, further studies are needed.
    MeSH term(s) Humans ; Male ; Androgens/therapeutic use ; Diabetes Mellitus, Type 2/drug therapy ; Diabetes Mellitus, Type 2/diagnosis ; Eunuchism/drug therapy ; Hypoglycemic Agents/therapeutic use ; Hypogonadism ; Obesity/complications ; Obesity/metabolism ; Testosterone/blood ; Testosterone/chemistry ; Testosterone/metabolism
    Chemical Substances Androgens ; Hypoglycemic Agents ; Testosterone (3XMK78S47O)
    Language English
    Publishing date 2022-11-11
    Publishing country England
    Document type Systematic Review ; Journal Article ; Review
    ZDB-ID 2696108-8
    ISSN 2047-2927 ; 2047-2919
    ISSN (online) 2047-2927
    ISSN 2047-2919
    DOI 10.1111/andr.13318
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Treatment of Men with Central Hypogonadism

    Veerle Ide / Dirk Vanderschueren / Leen Antonio

    International Journal of Molecular Sciences, Vol 22, Iss 21, p

    Alternatives for Testosterone Replacement Therapy

    2021  Volume 21

    Abstract: Central hypogonadism is a clinical condition, characterized by sexual symptoms and low serum testosterone levels, due to an impaired function of the hypothalamus or pituitary gland. Testosterone replacement therapy (TRT) is the standard treatment for ... ...

    Abstract Central hypogonadism is a clinical condition, characterized by sexual symptoms and low serum testosterone levels, due to an impaired function of the hypothalamus or pituitary gland. Testosterone replacement therapy (TRT) is the standard treatment for hypogonadism, but it has some disadvantages. TRT is not a good option in men wishing to preserve fertility, nor in men with (a high risk of) prostate cancer, polycythemia, thrombophilia and severe cardiovascular disease. In this review, we discuss alternative treatments for central hypogonadism. If reversible causes are present, non-pharmacological interventions can be therapeutic. Gonadotropins are a good alternative to TRT when fertility is desired in the near future though they require frequent injections. Clomiphene citrate and tamoxifen seem to be a safe alternative for the treatment of functional central hypogonadism in men, as several studies reported a significant increase in testosterone levels with these drugs. However, their use is off-label and data supporting the efficacy of clomiphene citrate and tamoxifen on hypogonadal symptoms are insufficient. For this reason, clomiphene citrate and tamoxifen should not be used in routine clinical practice to treat sexual symptoms in men with central hypogonadism.
    Keywords central hypogonadism ; hypogonadotropic hypogonadism ; functional hypogonadism ; late-onset hypogonadism ; gonadotropins ; tamoxifen ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Language English
    Publishing date 2021-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Treatment of Men with Central Hypogonadism: Alternatives for Testosterone Replacement Therapy.

    Ide, Veerle / Vanderschueren, Dirk / Antonio, Leen

    International journal of molecular sciences

    2020  Volume 22, Issue 1

    Abstract: Central hypogonadism is a clinical condition, characterized by sexual symptoms and low serum testosterone levels, due to an impaired function of the hypothalamus or pituitary gland. Testosterone replacement therapy (TRT) is the standard treatment for ... ...

    Abstract Central hypogonadism is a clinical condition, characterized by sexual symptoms and low serum testosterone levels, due to an impaired function of the hypothalamus or pituitary gland. Testosterone replacement therapy (TRT) is the standard treatment for hypogonadism, but it has some disadvantages. TRT is not a good option in men wishing to preserve fertility, nor in men with (a high risk of) prostate cancer, polycythemia, thrombophilia and severe cardiovascular disease. In this review, we discuss alternative treatments for central hypogonadism. If reversible causes are present, non-pharmacological interventions can be therapeutic. Gonadotropins are a good alternative to TRT when fertility is desired in the near future though they require frequent injections. Clomiphene citrate and tamoxifen seem to be a safe alternative for the treatment of functional central hypogonadism in men, as several studies reported a significant increase in testosterone levels with these drugs. However, their use is off-label and data supporting the efficacy of clomiphene citrate and tamoxifen on hypogonadal symptoms are insufficient. For this reason, clomiphene citrate and tamoxifen should not be used in routine clinical practice to treat sexual symptoms in men with central hypogonadism.
    MeSH term(s) Androgens/blood ; Androgens/therapeutic use ; Clomiphene/therapeutic use ; Fertility/drug effects ; Hormone Replacement Therapy/methods ; Humans ; Hypogonadism/drug therapy ; Male ; Selective Estrogen Receptor Modulators/therapeutic use ; Testosterone/blood ; Testosterone/therapeutic use ; Treatment Outcome
    Chemical Substances Androgens ; Selective Estrogen Receptor Modulators ; Clomiphene (1HRS458QU2) ; Testosterone (3XMK78S47O)
    Language English
    Publishing date 2020-12-22
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms22010021
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Bone health in ageing men.

    David, Karel / Narinx, Nick / Antonio, Leen / Evenepoel, Pieter / Claessens, Frank / Decallonne, Brigitte / Vanderschueren, Dirk

    Reviews in endocrine & metabolic disorders

    2022  

    Abstract: Osteoporosis does not only affect postmenopausal women, but also ageing men. The burden of disease is projected to increase with higher life expectancy both in females and males. Importantly, osteoporotic men remain more often undiagnosed and untreated ... ...

    Abstract Osteoporosis does not only affect postmenopausal women, but also ageing men. The burden of disease is projected to increase with higher life expectancy both in females and males. Importantly, osteoporotic men remain more often undiagnosed and untreated compared to women. Sex steroid deficiency is associated with bone loss and increased fracture risk, and circulating sex steroid levels have been shown to be associated both with bone mineral density and fracture risk in elderly men. However, in contrast to postmenopausal osteoporosis, the contribution of relatively small decrease of circulating sex steroid concentrations in the ageing male to the development of osteoporosis and related fractures, is probably only minor. In this review we provide several clinical and preclinical arguments in favor of a 'bone threshold' for occurrence of hypogonadal osteoporosis, corresponding to a grade of sex steroid deficiency that in general will not occur in many elderly men. Testosterone replacement therapy has been shown to increase bone mineral density in men, however data in osteoporotic ageing males are scarce, and evidence on fracture risk reduction is lacking. We conclude that testosterone replacement therapy should not be used as a sole bone-specific treatment in osteoporotic elderly men.
    Language English
    Publishing date 2022-07-16
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 2185718-0
    ISSN 1573-2606 ; 1389-9155
    ISSN (online) 1573-2606
    ISSN 1389-9155
    DOI 10.1007/s11154-022-09738-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Aromatase inhibitors and selective estrogen receptor modulators: Unconventional therapies for functional hypogonadism?

    Awouters, Marijke / Vanderschueren, Dirk / Antonio, Leen

    Andrology

    2019  Volume 8, Issue 6, Page(s) 1590–1597

    Abstract: Introduction: Functional hypogonadism increases in prevalence due to aging as well as an overall increase of obesity. Aromatase inhibitors (AIs) and selective estrogen receptor modulators (SERMs) could be an alternative for testosterone replacement ... ...

    Abstract Introduction: Functional hypogonadism increases in prevalence due to aging as well as an overall increase of obesity. Aromatase inhibitors (AIs) and selective estrogen receptor modulators (SERMs) could be an alternative for testosterone replacement therapy (TRT), but have not yet been established as common clinical practice.
    Methods: We conducted a thorough search of the literature published between 2009 and 2018. Only RCTs published in English were included. We assessed the impact of AIs and SERMs on gonadal steroids, sexual function and semen parameters, body composition and glucose homeostasis, physical function, bone mineral density (BMD), anemia, as well as potential adverse effects.
    Results: Twelve RCTs were included, with a total number of 645 patients. A total of 145 men were included in RCTs comparing AIs versus placebo or TRT and 476 men in RCTs with SERMs versus placebo or TRT. One RCT compared AIs versus SERMs in 24 men. Inclusion criteria were heterogenic. Most studies only included a small number of patients (range 11-256) and follow-up time was relatively short (6 weeks to 12 months). AIs as well as SERMs increased serum testosterone levels. Overall, there was no effect on sexual symptoms nor on semen parameters. Following aromatase inhibition, only minimal improvement of body composition and physical function was observed in some of the trials, but spinal BMD decreased. SERMs only induced a small improvement in body composition. The effect of SERMs on physical function and on BMD was not assessed. No major adverse effects occurred.
    Conclusion: AIs are not recommended as treatment for functional hypogonadism because of insufficient efficacy as well as a decrease in BMD. SERMs might be an alternative for TRT, but more research is needed to evaluate their effect on hypogonadal signs and symptoms, as well as on their long-term safety profile.
    MeSH term(s) Aromatase Inhibitors/adverse effects ; Aromatase Inhibitors/therapeutic use ; Biomarkers/blood ; Eunuchism/blood ; Eunuchism/diagnosis ; Eunuchism/drug therapy ; Eunuchism/physiopathology ; Hormone Replacement Therapy ; Humans ; Male ; Randomized Controlled Trials as Topic ; Selective Estrogen Receptor Modulators/adverse effects ; Selective Estrogen Receptor Modulators/therapeutic use ; Testosterone/blood ; Testosterone/deficiency ; Testosterone/therapeutic use ; Treatment Outcome
    Chemical Substances Aromatase Inhibitors ; Biomarkers ; Selective Estrogen Receptor Modulators ; Testosterone (3XMK78S47O)
    Language English
    Publishing date 2019-12-02
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2696108-8
    ISSN 2047-2927 ; 2047-2919
    ISSN (online) 2047-2927
    ISSN 2047-2919
    DOI 10.1111/andr.12725
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Estradiol and Age-Related Bone Loss in Men.

    Jardí, Ferran / Laurent, Michaël R / Claessens, Frank / Vanderschueren, Dirk

    Physiological reviews

    2018  Volume 98, Issue 1, Page(s) 1

    Language English
    Publishing date 2018-01-01
    Publishing country United States
    Document type Letter
    ZDB-ID 209902-0
    ISSN 1522-1210 ; 0031-9333
    ISSN (online) 1522-1210
    ISSN 0031-9333
    DOI 10.1152/physrev.00051.2017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Clinical and genetic determinants of vitamin D receptor expression in cutaneous melanoma patients.

    De Smedt, Julie / Aura, Claudia / Van Kelst, Sofie / Janssen, Laudine / Marasigan, Vivien / Boecxstaens, Veerle / Stas, Marguerite / Bogaerts, Kris / Belmans, Ann / Cleynen, Isabelle / Vanderschueren, Dirk / Vandenberghe, Katleen / Bechter, Oliver / Nikkels, Arjen / Strobbe, Tinne / Emri, Gabriella / Lambrechts, Dieter / Garmyn, Marjan

    Melanoma research

    2024  Volume 34, Issue 2, Page(s) 125–133

    Abstract: Decrease of vitamin D receptor (VDR) expression is observed in melanocytic naevi and melanoma compared to normal skin. Little is known about factors influencing VDR expression in cutaneous melanoma (CM). We investigated the correlation of VDR expression ... ...

    Abstract Decrease of vitamin D receptor (VDR) expression is observed in melanocytic naevi and melanoma compared to normal skin. Little is known about factors influencing VDR expression in cutaneous melanoma (CM). We investigated the correlation of VDR expression in CM with 25-hydroxy vitamin D (25OHD) levels, demographic/clinical parameters, genetic variants of VDR and pathology of the primary tumor. Demographic/clinical parameters were recorded in 407 prospectively recruited CM patients of a multi-center controlled study (ViDMe trial). We determined VDR expression both in the nucleus and in the cytoplasm by semi-quantitative assessment in CM tissue using histochemistry in 279 patients, expressed in percentages and histoscore (H-score). Genomic DNA from 332 patients was extracted to genotype thirteen VDR single nucleotide polymorphisms (SNPs) using TaqMan. VDR expression in CM tissue from 279 patients was correlated with clinical/demographic parameters and 25OHD levels (univariable and multivariable analysis), VDR SNPs (univariable analysis) and pathology parameters of primary CM tissue (univariable analysis). Cytoplasmic VDR expression was increased in patients who stated to have a high sun exposure during their life compared to patients with low sun exposure (p H-score,univariable : 0.001, p H-score,multivariable : 0.004). The A allele of the genetic VDR polymorphism Fok1 was associated with a higher expression of the VDR in the cytoplasm (p cytoplasmic, univariable : 0.001 and p H-score, univariable : 0.02). In the primary tumor, presence of mitosis (p nucleus,%, univariable : 0.002) and perineural invasion (p nucleus,%,univariable : 0.03) were significantly associated with low nuclear VDR expression. ClinicalTrials.gov Identifier: NCT01748448.
    MeSH term(s) Humans ; Alleles ; Melanoma/genetics ; Receptors, Calcitriol/genetics ; Skin ; Skin Neoplasms/genetics
    Chemical Substances Receptors, Calcitriol ; VDR protein, human
    Language English
    Publishing date 2024-02-13
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1095779-0
    ISSN 1473-5636 ; 0960-8931
    ISSN (online) 1473-5636
    ISSN 0960-8931
    DOI 10.1097/CMR.0000000000000929
    Database MEDical Literature Analysis and Retrieval System OnLINE

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