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  1. Article ; Online: A (p)ppGpp-null mutant of Haemophilus ducreyi is partially attenuated in humans due to multiple conflicting phenotypes.

    Holley, Concerta / Gangaiah, Dharanesh / Li, Wei / Fortney, Kate R / Janowicz, Diane M / Ellinger, Sheila / Zwickl, Beth / Katz, Barry P / Spinola, Stanley M

    Infection and immunity

    2014  Volume 82, Issue 8, Page(s) 3492–3502

    Abstract: p)ppGpp responds to nutrient limitation through a global change in gene regulation patterns ... which primarily synthesize and hydrolyze (p)ppGpp in Escherichia coli. We constructed relA and relA spoT ... deletion mutants to assess the contribution of (p)ppGpp to H. ducreyi pathogenesis. Both the relA single mutant and ...

    Abstract (p)ppGpp responds to nutrient limitation through a global change in gene regulation patterns to increase survival. The stringent response has been implicated in the virulence of several pathogenic bacterial species. Haemophilus ducreyi, the causative agent of chancroid, has homologs of both relA and spoT, which primarily synthesize and hydrolyze (p)ppGpp in Escherichia coli. We constructed relA and relA spoT deletion mutants to assess the contribution of (p)ppGpp to H. ducreyi pathogenesis. Both the relA single mutant and the relA spoT double mutant failed to synthesize (p)ppGpp, suggesting that relA is the primary synthetase of (p)ppGpp in H. ducreyi. Compared to the parent strain, the double mutant was partially attenuated for pustule formation in human volunteers. The double mutant had several phenotypes that favored attenuation, including increased sensitivity to oxidative stress. The increased sensitivity to oxidative stress could be complemented in trans. However, the double mutant also exhibited phenotypes that favored virulence. When grown to the mid-log phase, the double mutant was significantly more resistant than its parent to being taken up by human macrophages and exhibited increased transcription of lspB, which is involved in resistance to phagocytosis. Additionally, compared to the parent, the double mutant also exhibited prolonged survival in the stationary phase. In E. coli, overexpression of DksA compensates for the loss of (p)ppGpp; the H. ducreyi double mutant expressed higher transcript levels of dksA than the parent strain. These data suggest that the partial attenuation of the double mutant is likely the net result of multiple conflicting phenotypes.
    MeSH term(s) Adult ; Dermatitis/microbiology ; Dermatitis/pathology ; Female ; Gene Deletion ; Genetic Complementation Test ; Guanosine Pentaphosphate/deficiency ; Haemophilus ducreyi/genetics ; Haemophilus ducreyi/pathogenicity ; Healthy Volunteers ; Humans ; Ligases/genetics ; Ligases/metabolism ; Male ; Middle Aged ; Pyrophosphatases/genetics ; Pyrophosphatases/metabolism
    Chemical Substances Guanosine Pentaphosphate (38918-96-6) ; guanosine-3',5'-bis(diphosphate) 3'-pyrophosphatase (EC 3.1.7.2) ; Pyrophosphatases (EC 3.6.1.-) ; Ligases (EC 6.-) ; guanosine 3',5'-polyphosphate synthetases (EC 6.-)
    Language English
    Publishing date 2014-06-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 218698-6
    ISSN 1098-5522 ; 0019-9567
    ISSN (online) 1098-5522
    ISSN 0019-9567
    DOI 10.1128/IAI.01994-14
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Demystifying natural gas distribution grid decommissioning: An open-source approach to local deep decarbonization of urban neighborhoods

    Zwickl-Bernhard, Sebastian / Auer, H.

    Energy. 2022 Jan. 01, v. 238 p.121805-

    2022  

    Abstract: In this paper, deep decarbonization in an urban neighborhood in Vienna, Austria is proposed focusing on decommissioning of the gas distribution grid for heat supply rather than trying to feed in “green” gas in the future. The core objective is to ... ...

    Abstract In this paper, deep decarbonization in an urban neighborhood in Vienna, Austria is proposed focusing on decommissioning of the gas distribution grid for heat supply rather than trying to feed in “green” gas in the future. The core objective is to demonstrate that alternative network infrastructures and energy technologies ensure not only an adequate but also an even superior provision of local heat energy services. Two different deep decarbonization pathways are studied, namely, electrification of almost all energy services and expansion of the district heating network. In addition, future district cooling service supply is considered. The method applied couples and extends two open-source models offering a complete analysis toolkit covering a high spatial and temporal resolution. The results show that deep decarbonization of local multiple-energy carrier systems is possible, without being dependent on the existing distribution grid of natural gas. Possible stranded assets (also at the gas end-user level) must not play a decisive role, especially since the trade-off analyses in this work show that alternative scenarios of lower/zero-emission energy service provision are even more economical in the longer term since the CO₂ price is expected to increase in the next decades. Future work may focus, among others, on the energy generation technology mix feeding into the district heating grid, the local mobility service needs, and a higher granularity to improve the assessment of the on-site (building-integrated) renewable generation potential associated with the emergence of energy community concepts.
    Keywords carbon dioxide ; carbon markets ; heating systems ; natural gas ; renewable energy sources ; urban areas ; zero emissions ; Austria ; Distribution grid decommissioning ; Decarbonization ; District heating/cooling ; Open-source modeling ; Urban neighborhoods
    Language English
    Dates of publication 2022-0101
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 2019804-8
    ISSN 0360-5442 ; 0360-5442
    ISSN (online) 0360-5442
    ISSN 0360-5442
    DOI 10.1016/j.energy.2021.121805
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Early Access to Testosterone Therapy in Transgender and Gender-Diverse Adults Seeking Masculinization: A Randomized Clinical Trial.

    Nolan, Brendan J / Zwickl, Sav / Locke, Peter / Zajac, Jeffrey D / Cheung, Ada S

    JAMA network open

    2023  Volume 6, Issue 9, Page(s) e2331919

    Abstract: ... a decrease in gender dysphoria (mean difference, -7.2 points; 95% CI, -8.3 to -6.1 points; P < .001 ... 6 points; 95% CI, -6.8 to -4.4 points; P < .001), and a significant decrease in suicidality (mean ... difference in SIDAS score, -6.5 points; 95% CI, -8.2 to -4.8 points; P < .001). Resolution of suicidality ...

    Abstract Importance: Testosterone treatment is a necessary component of care for some transgender and gender-diverse individuals. Observational studies have reported associations between commencement of gender-affirming hormone therapy and improvements in gender dysphoria and depression, but there is a lack of data from randomized clinical trials.
    Objective: To assess the effect of testosterone therapy compared with no treatment on gender dysphoria, depression, and suicidality in transgender and gender-diverse adults seeking masculinization.
    Design, setting, and participants: A 3-month open-label randomized clinical trial was conducted at endocrinology outpatient clinics and primary care clinics specializing in transgender and gender-diverse health in Melbourne, Australia, from November 1, 2021, to July 22, 2022. Participants included transgender and gender-diverse adults aged 18 to 70 years seeking initiation of testosterone therapy.
    Interventions: Immediate initiation of testosterone commencement (intervention group) or no treatment (standard care waiting list of 3 months before commencement). This design ensured no individuals would be waiting longer than the time to standard care.
    Main outcomes and measures: The primary outcome was gender dysphoria, as measured by the Gender Preoccupation and Stability Questionnaire. Secondary outcomes included the Patient Health Questionnaire-9 (PHQ-9) to assess depression and the Suicidal Ideation Attributes Scale (SIDAS) to assess suicidality. Questionnaires were undertaken at 0 and 3 months. The evaluable cohort was analyzed.
    Results: Sixty-four transgender and gender-diverse adults (median [IQR] age, 22.5 [20-27] years) were randomized. Compared with standard care, the intervention group had a decrease in gender dysphoria (mean difference, -7.2 points; 95% CI, -8.3 to -6.1 points; P < .001), a clinically significant decrease in depression (ie, change in score of 5 points on PHQ-9; mean difference, -5.6 points; 95% CI, -6.8 to -4.4 points; P < .001), and a significant decrease in suicidality (mean difference in SIDAS score, -6.5 points; 95% CI, -8.2 to -4.8 points; P < .001). Resolution of suicidality assessed by PHQ-9 item 9 occurred in 11 individuals (52%) with immediate testosterone commencement compared with 1 (5%) receiving standard care (P = .002). Seven individuals reported injection site pain/discomfort and 1 individual reported a transient headache 24 hours following intramuscular administration of testosterone undecanoate. No individual developed polycythemia.
    Conclusions and relevance: In this open-label randomized clinical trial of testosterone therapy in transgender and gender-diverse adults, immediate testosterone compared with no treatment significantly reduced gender dysphoria, depression, and suicidality in transgender and gender-diverse individuals desiring testosterone therapy.
    Trial registration: ANZCTR Identifier: ACTRN1262100016864.
    MeSH term(s) Adult ; Humans ; Young Adult ; Transgender Persons ; Testosterone/therapeutic use ; Testosterone Congeners ; Ambulatory Care Facilities ; Australia
    Chemical Substances Testosterone (3XMK78S47O) ; Testosterone Congeners
    Language English
    Publishing date 2023-09-05
    Publishing country United States
    Document type Randomized Controlled Trial ; Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2574-3805
    ISSN (online) 2574-3805
    DOI 10.1001/jamanetworkopen.2023.31919
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Response to Letter to the editor from Kirk & Stebbings: The Impact of Gender-Affirming Hormone Therapy on Physical Performance.

    Cheung, Ada S / Zwickl, Sav / Miller, Kirsti / Nolan, Brendan J / Wong, Alex Fang Qi / Jones, Patrice / Eynon, Nir

    The Journal of clinical endocrinology and metabolism

    2024  

    Language English
    Publishing date 2024-03-19
    Publishing country United States
    Document type Editorial ; Comment
    ZDB-ID 3029-6
    ISSN 1945-7197 ; 0021-972X
    ISSN (online) 1945-7197
    ISSN 0021-972X
    DOI 10.1210/clinem/dgae131
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Evaluation of personalized cancer therapies based on comprehensive genomic profiling in a middle-sized oncologic center in Austria, the University Clinic Krems.

    Singer, Josef / Brauneck, Elias / Zwickl-Traxler, Elisabeth / Pecherstorfer, Martin

    Translational oncology

    2021  Volume 14, Issue 5, Page(s) 101021

    Abstract: ... treated patients (p = 0,0165 with a median PFS of 151 days, compared to 83 days in the chemotherapy group ...

    Abstract Background and aim: To successfully apply personalized cancer therapies, thorough understanding of the patient's tumor is needed. In-depth, comprehensive genomic profiling systems allow gathering this knowledge by testing hundreds of cancer-related genes. Several large institutions have established precision oncology programs in recent years with promising results for patients. However, especially middle-sized oncologic institutions face challenges to implement such programs. This study aims to retrospectively analyze the effects of comprehensive genomic tumor profiling with respect to feasibility and effectiveness in a middle-sized oncologic center in Austria.
    Methods: From May 1st, 2016 to December 31st, 2019 patients at the University Clinic Krems, who suffered from CUP-syndromes plus patients, who were resistant to conventional therapy or have progressed after all available therapy lines, were offered to get their tumors analyzed by comprehensive genomic profiling in order to establish a customized therapy.
    Results: Of 69 considered patients, 64 patients' samples could be profiled. The median number of detected alterations was 4 (minimum 0; maximum 23). Most frequent alterations were reported for TP53, KRAS and CDKN2A/B. In 13 patients (20% of 64 successful profiles), personalized therapies could be initiated. 22 patients were treated with another line of chemotherapy as no actionable alteration could be detected. Effectiveness, determined by a PFS of the newly initiated therapy longer than 130% of the last conventional therapy line, could be seen in 8 of 13 patients (61,5%) of the precision oncology cohort compared to only 3 of 22 patients (13,5%) in the chemotherapy group. Additionally, Kaplan-Meier curves of PFS demonstrate a significant benefit for personalized treated patients (p = 0,0165 with a median PFS of 151 days, compared to 83 days in the chemotherapy group).
    Conclusion: In summary, personalized cancer therapy based on comprehensive genomic profiling is effective and feasible also in the setting of a middle-sized oncologic center.
    Language English
    Publishing date 2021-02-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2443840-6
    ISSN 1936-5233
    ISSN 1936-5233
    DOI 10.1016/j.tranon.2021.101021
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: The Impact of Gender-Affirming Hormone Therapy on Physical Performance.

    Cheung, Ada S / Zwickl, Sav / Miller, Kirsti / Nolan, Brendan J / Wong, Alex Fang Qi / Jones, Patrice / Eynon, Nir

    The Journal of clinical endocrinology and metabolism

    2023  Volume 109, Issue 2, Page(s) e455–e465

    Abstract: Context: The inclusion of transgender people in elite sport has been a topic of debate. This narrative review examines the impact of gender-affirming hormone therapy (GAHT) on physical performance, muscle strength, and markers of endurance.: Evidence ... ...

    Abstract Context: The inclusion of transgender people in elite sport has been a topic of debate. This narrative review examines the impact of gender-affirming hormone therapy (GAHT) on physical performance, muscle strength, and markers of endurance.
    Evidence acquisition: MEDLINE and Embase were searched using terms to define the population (transgender), intervention (GAHT), and physical performance outcomes.
    Evidence synthesis: Existing literature comprises cross-sectional or small uncontrolled longitudinal studies of short duration. In nonathletic trans men starting testosterone therapy, within 1 year, muscle mass and strength increased and, by 3 years, physical performance (push-ups, sit-ups, run time) improved to the level of cisgender men. In nonathletic trans women, feminizing hormone therapy increased fat mass by approximately 30% and decreased muscle mass by approximately 5% after 12 months, and steadily declined beyond 3 years. While absolute lean mass remains higher in trans women, relative percentage lean mass and fat mass (and muscle strength corrected for lean mass), hemoglobin, and VO2 peak corrected for weight was no different to cisgender women. After 2 years of GAHT, no advantage was observed for physical performance measured by running time or in trans women. By 4 years, there was no advantage in sit-ups. While push-up performance declined in trans women, a statistical advantage remained relative to cisgender women.
    Conclusion: Limited evidence suggests that physical performance of nonathletic trans people who have undergone GAHT for at least 2 years approaches that of cisgender controls. Further controlled longitudinal research is needed in trans athletes and nonathletes.
    MeSH term(s) Male ; Humans ; Female ; Cross-Sectional Studies ; Transsexualism/drug therapy ; Testosterone/therapeutic use ; Transgender Persons ; Physical Functional Performance
    Chemical Substances Testosterone (3XMK78S47O)
    Language English
    Publishing date 2023-07-11
    Publishing country United States
    Document type Review ; Journal Article
    ZDB-ID 3029-6
    ISSN 1945-7197 ; 0021-972X
    ISSN (online) 1945-7197
    ISSN 0021-972X
    DOI 10.1210/clinem/dgad414
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  7. Article ; Online: Epidemiology of Intensive Care Patients Classified as a Third Sex in Australia and New Zealand.

    Modra, Lucy J / Higgins, Alisa M / Pilcher, David V / Cheung, Ada S / Carpenter, Morgan N / Bailey, Michael / Zwickl, Sav / Bellomo, Rinaldo

    Chest

    2023  

    Abstract: ... 18.4 years; P = .02) or male (63.2 ± 16.7 years; P < .001), respectively. Patients classified ...

    Abstract Background: Patient sex affects treatment and outcomes in critical illness. Previous studies of sex differences in critical illness compared female and male patients. In this study, we describe the group of patients classified as a third sex admitted to ICUs in Australia and New Zealand.
    Research question: What are the admission characteristics and outcomes of ICU patients classified as belonging to a third sex group compared with patients classified as female or male?
    Study design and methods: Retrospective observational study of admissions to 200 ICUs, recorded in the Australian and New Zealand Intensive Care Society's Adult Patient Database from 2018 to 2022. We undertook mixed effect logistic regression to compare hospital mortality across the sex groups, adjusted for illness severity, diagnosis, treatment limitation, year, and hospital.
    Results: We examined 892,161 admissions, of whom 525 (0.06%) were classified as third sex. Patients classified as third sex were represented across all diagnostic categories, jurisdictions, and hospital types. On average, they were younger than the groups classified as female (59.2 ± 20.0 vs 61.3 ± 18.4 years; P = .02) or male (63.2 ± 16.7 years; P < .001), respectively. Patients classified as third sex were more likely to be admitted after orthopedic surgery (10.1% third sex admissions [95% CI, 7.7%-13.0%]; 6.2% female [95% CI, 6.1%-6.3%]; 4.8% male [95% CI, 4.7%-4.9%]) and drug overdose (8.8% third sex admissions [95% CI, 6.5%-11.5%]; 4.2% female [95% CI, 4.1%-4.2%]; 3.1% male [95% CI, 3.0%-3.1%]). There was no difference in the adjusted hospital mortality of patients classified as third sex compared with the other groups.
    Interpretation: Patients classified as third sex composed a small minority group of adult ICU patients. This group had a different diagnostic case mix but similar outcomes to the groups classified as female or male. Further characterizing a third sex group will require improved processes for recording sex and gender in health records.
    Language English
    Publishing date 2023-12-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1032552-9
    ISSN 1931-3543 ; 0012-3692
    ISSN (online) 1931-3543
    ISSN 0012-3692
    DOI 10.1016/j.chest.2023.11.043
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  8. Article ; Online: Prescription Patterns and Testosterone Concentrations Achieved With AndroForte 5% Testosterone Cream in Transgender and Gender Diverse Individuals.

    Nolan, Brendan J / Zwickl, Sav / Locke, Peter / Simpson, Satu / Li, Ling / Zajac, Jeffrey D / Cheung, Ada S

    The journal of sexual medicine

    2022  Volume 19, Issue 6, Page(s) 1049–1054

    Abstract: ... masculinization. Nolan BJ, Zwickl S, Locke P, et al. Prescription Patterns and Testosterone Concentrations ...

    Abstract Background: Masculinizing hormone therapy with testosterone is used to align an individual's physical characteristics with their gender identity in trans and gender diverse individuals. Standard testosterone doses and formulations recommended for hypogonadal cisgender men are typically administered. 100 mg AndroForte 5% testosterone cream is the recommended starting dose in hypogonadal cisgender men but there are no data evaluating the use of AndroForte 5% testosterone cream in gender-affirming hormone therapy regimens.
    Aim: To assess the prescription patterns and serum total testosterone concentrations achieved with AndroForte 5% testosterone cream in trans and gender diverse individuals.
    Methods: A retrospective analysis was undertaken of trans and gender diverse individuals at a primary and secondary care clinic in Melbourne, Australia. Seventy-two individuals treated with AndroForte 5% testosterone cream to the torso were included.
    Outcomes: Testosterone dose and serum total testosterone concentration.
    Results: Median age was 26 years (IQR 22-30) and median duration of testosterone therapy was 14 months (7-24). Fifty (69%) individuals had a non-binary gender identity. Initial median testosterone dose was 50 mg (50-100) daily. Thirty-eight (53%) commenced doses <100 mg daily, the recommended starting dose for hypogonadal cisgender men. Median total testosterone concentration achieved from 186 individual laboratory results was 11.9 nmol/L (8.1-16.4). Polycythemia was documented in 5 (7%) individuals.
    Clinical implications: AndroForte 5% testosterone cream can be used in individuals with a binary and/or non-binary gender identity seeking masculinization. It can be commenced at a lower dose than that administered to hypogonadal cisgender men for individuals seeking slow masculinization goals.
    Strengths & limitations: Limitations include the retrospective study design, lack of clinical end points and lack of standardization of timing of laboratory tests in relation to the last dose. This is the first study to evaluate AndroForte 5% testosterone cream in trans and gender diverse individuals and provides insights into prescription patterns in individuals with a non-binary gender identity.
    Conclusion: AndroForte 5% testosterone cream represents an alternative formulation of testosterone administration for trans and gender diverse individuals seeking masculinization. Nolan BJ, Zwickl S, Locke P, et al. Prescription Patterns and Testosterone Concentrations Achieved With AndroForte 5% Testosterone Cream in Transgender and Gender Diverse Individuals. J Sex Med 2022;19:1049-1054.
    MeSH term(s) Adult ; Female ; Gender Identity ; Humans ; Male ; Prescriptions ; Retrospective Studies ; Testosterone/therapeutic use ; Transgender Persons
    Chemical Substances Testosterone (3XMK78S47O)
    Language English
    Publishing date 2022-03-30
    Publishing country Netherlands
    Document type Case Reports ; Research Support, Non-U.S. Gov't
    ZDB-ID 2251959-2
    ISSN 1743-6109 ; 1743-6095
    ISSN (online) 1743-6109
    ISSN 1743-6095
    DOI 10.1016/j.jsxm.2022.02.020
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Prospective study to compare axial position stability after fellow-eye implantation of 2 distinct intraocular lens designs.

    Hienert, Julius / Hirnschall, Nino / Ruiss, Manuel / Ullrich, Marlies / Zwickl, Hannah / Findl, Oliver

    Journal of cataract and refractive surgery

    2021  Volume 47, Issue 8, Page(s) 999–1005

    Abstract: ... significantly different in eyes implanted with the C-loop IOL compared with the 4-point haptic IOL (P < .001 ... The overall IOL shift was 0.25 ± 0.16 mm for the 4-point haptic IOL and 0.14 ± 0.09 mm for the C-loop IOL (P ...

    Abstract Purpose: To compare the dynamics of axial intraocular lens (IOL) position and stability in the capsular bag after fellow-eye implantation of a 1-piece C-loop and a 4-point haptic IOL.
    Setting: Hanusch Hospital, Vienna.
    Design: Prospective, comparative, randomized bilateral study.
    Methods: One hundred eyes of 50 patients were randomly implanted with a C-loop IOL (CT LUCIA 611P) in 1 eye and a 4-point haptic IOL (CT ASPHINA 409MP) in the other eye. Anterior chamber depth (ACD) was measured at 1 week (W1), 1 month (M1), and 4 to 6 months (M4-6) postoperatively using a swept-source optical coherence tomography device (IOLMaster 700). Uncorrected distance visual acuity (UDVA), corrected distance visual acuity, and subjective refraction outcomes were assessed at M4-6 postoperative follow-up.
    Results: Hundred eyes of 50 patient were included. Pseudophakia ACD values at W1, M1, and M4-6 timepoints were significantly different in eyes implanted with the C-loop IOL compared with the 4-point haptic IOL (P < .001). The overall IOL shift was 0.25 ± 0.16 mm for the 4-point haptic IOL and 0.14 ± 0.09 mm for the C-loop IOL (P < .001). The M4-6 mean monocular UDVA outcome for eyes with C-loop IOL was 0.06 ± 0.14 logarithm of the minimum angle of resolution (logMAR) and 0.03 ± 0.10 logMAR for the eyes with 4-point haptic IOL. M4-6 mean spherical equivalent was -0.32 ± 0.48 diopter (D) in the C-loop IOL group and -0.33 ± 0.42 D in the 4-point haptic IOL group.
    Conclusions: Statistically significant differences in IOL design results in different postoperative ACD values. No relevant or statistically significant differences were found in refraction or visual acuity between the groups.
    Language English
    Publishing date 2021-02-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 632744-8
    ISSN 1873-4502 ; 0886-3350
    ISSN (online) 1873-4502
    ISSN 0886-3350
    DOI 10.1097/j.jcrs.0000000000000557
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  10. Article: Testosterone concentrations and prescription patterns of 1% testosterone gel in transgender and gender diverse individuals.

    Nolan, Brendan J / Zwickl, Sav / Wong, Alex F Q / Locke, Peter / Simpson, Satu / Li, Ling / Zajac, Jeffrey D / Cheung, Ada S

    Therapeutic advances in endocrinology and metabolism

    2022  Volume 13, Page(s) 20420188221083512

    Abstract: Background: Masculinising hormone therapy with testosterone is used to align an individual's physical characteristics with their gender identity. Standard testosterone doses and formulations recommended for hypogonadal cisgender men are typically ... ...

    Abstract Background: Masculinising hormone therapy with testosterone is used to align an individual's physical characteristics with their gender identity. Standard testosterone doses and formulations recommended for hypogonadal cisgender men are typically administered, although there are currently limited data evaluating the use of 1% testosterone gel in gender-affirming hormone therapy regimens.
    Objectives: The objective of the study was to assess the prescription patterns and serum total testosterone concentrations achieved with 1% testosterone gel in trans and gender diverse individuals.
    Materials and methods: A retrospective cross-sectional analysis was undertaken of trans individuals at a primary and secondary care clinic in Melbourne, Australia. Sixty-seven individuals treated with 1% testosterone gel were included. Primary outcomes were testosterone dose and serum total testosterone concentration achieved.
    Results: Median age was 25 (22-30) years and median duration of testosterone therapy was 12 (7-40) months. Thirty-five (52%) individuals had a nonbinary gender identity. Initial median testosterone dose was 25 mg (12.5-31.3) daily. Fifty-two (78%) individuals commenced doses <50 mg daily, the recommended starting dose for hypogonadal cisgender men. Median total testosterone concentration achieved was 11.9 nmol/l (7.3-18.6). Polycythaemia (haematocrit >0.5) was documented in eight of 138 (6%) laboratory results in six individuals.
    Discussion and conclusions: One percent testosterone gel achieves serum total testosterone concentrations in the cisgender male reference range. A high proportion of individuals had a nonbinary gender identity and most individuals commenced a lower dose than that typically administered to hypogonadal cisgender men, potentially related to slow or 'partial' masculinisation goals.
    Language English
    Publishing date 2022-03-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2554822-0
    ISSN 2042-0196 ; 2042-0188
    ISSN (online) 2042-0196
    ISSN 2042-0188
    DOI 10.1177/20420188221083512
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