Abstract
Objective
To study the effect of prior testosterone replacement therapy (TRT) on the spermatogenic response to combined gonadotropin therapy (CGT) in severe and partial phenotype congenital hypogonadotropic hypogonadism (CHH) patients.
Design
Retrospective cohort study.
Setting
Tertiary care center.
Patients
Patients of CHH without (n = 17) and with prior TRT (n = 18) were subdivided into severe and partial groups, based on mean testicular volume ≤ 3 cc and > 3 cc respectively.
Intervention
Participants were treated with hMG at a dose of 75–150 U 3/week and gradually escalating doses of hCG until maximum dose (2000 U 3/week or 5000 U 2/week) or serum total testosterone of ≥ 3.5 ng/ml was reached.
Main outcome measures
Final mean TV, trough serum testosterone (T), sperm concentration
Results
Thirty-five patients (20 severe, baseline mean TV of 3.6 ± 2.7 ml) were started on CGT at 24.8 ± 6.1 years. The median duration of prior TRT was 38 (IQR 10–63.75) months in the exposed group. After 33 ± 12 months, final mean TV was 8.9 ± 5.5 ml, 86% achieved serum testosterone > 3.5 ng/ml and 70% achieved spermatogenesis [median 5 (0–12.6) million/ml]. Patients without prior TRT had significantly higher peak sperm count than those with prior- TRT (median 9 vs 0.05 million/ml, p = 0.004). This effect of prior TRT was more pronounced in severe phenotype patients (median 7 vs 0 million/ml, p = 0.01).
Conclusion
Prior-TRT may interfere with spermatogenic response to CGT in CHH patients, especially in those with a severe phenotype.
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Data availability
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
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Shah, R., Patil, V., Sarathi, V. et al. Prior testosterone replacement therapy may impact spermatogenic response to combined gonadotropin therapy in severe congenital hypogonadotropic hypogonadism. Pituitary 24, 326–333 (2021). https://doi.org/10.1007/s11102-020-01111-6
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DOI: https://doi.org/10.1007/s11102-020-01111-6