Testicular Dysfunction in 47,XXY Boys: When It All Begins. A Semilongitudinal Study
Authors' conclusion
The findings from this large prospective study contribute to our understanding of the natural history of testicular dysfunction in Klinefelter syndrome, underlining the importance of quantitative testicular US in infancy and childhood, as well as during pubertal development and transition age, for the optimal care of Klinefelter syndrome patients.
Study context
- Population
- Subjects with 47,XXY karyotype (Klinefelter syndrome), age range 7 months–55 years, naïve to TRT; divided by pubertal stage and age group (transition age and adults)
- Participants
- 155 subjects
- Outcome
- Natural history of testicular dysfunction
Main finding
As reported in the abstract
- Testicular development progresses until Tanner stage 4, with subsequent regression
- Sertoli and germ cell impairment not hormonally detected before Tanner stages 3-4: normal inhibin B until stage 4, fall in inhibin B/FSH ratio thereafter
- Testosterone/LH ratio peaks during Tanner stages 2-3 and declines from Tanner stage 4 onward, preceding overt hypogonadism
- Ultrasound (US) echotexture progressively worsens until transition age
- Quantitative US echotexture measures and presence of both hypoechoic lesions and microlithiasis independently and significantly predict lower circulating testosterone
Observational data: associations, not effects.
Original publication
Testicular Dysfunction in 47,XXY Boys: When It All Begins. A Semilongitudinal Study. J Clin Endocrinol Metab. Published 12 April 2023. doi:10.
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