In this prospective open clinical study, Pubertal Replacement in Boys Study (PRIBS), boys 14-16 years with delayed puberty in terms of slow pubertal progression, were randomized to SoC treatment with TE: Testostoviron depot® 75 mg intramuscularly (i.m) / month (6 injections), or low dose TU: Nebido® 250mg i.m. / 3 months (2 injections). Our goal was to implement a study similar to clinical routine.

Boys 14-16 years with pubertal delay were randomized to standard treatment with TE (Testosterone enanthat 75mg /month 6 injections)or newer treatment TU(Testosterone Undecanooat 250mg 2 injections 3 months apart) for pubertal induction. Our study PRIBS (pubertal replacement in boys study) was academically sponsored, monitored and approved by the medical products agency in Sweden. Between 2014 -08 and 2019-07 27 boys were randomized to treatment with TE (12 boys) or TU (15 boys). Testosterone levels were measured twice before study start and after 2,7,30,60,90,180 and 365 days. Boys with delayed puberty > 14 years with morning testosterone levels 0,5 - 3 Nmol/L and testicular volume ≤ 6 mL were included.Primary Outcome was testicular enlargement ≥ 8mL after 12 months. The new treatment was considered clinically similar if the treatment result were in the 80-125% interwall of the traditional group. Fishers exact chi square test was used for this analysis. Our intention was to recruit 20 boys in each armInformed consent was signed before study start by parents and assent by the boys. PRIBS was approved by the regional ethic committee 2012-09-14 Dnr 506-12 and approved by Union Drug Regulating Authorities Clinical Trials Database EudraCT nr 2012-002337-11 and the Swedish drug authorities (Läkemedelsverket) All study personal was trained in ICH GCP (good clinical practice).

Inclusion Criteria:

• • Signed informed consent

  • Two morning testosterone values (07.30-09.00) of 1-3 nmol/L and at start < 4 mmol/L ¹
  • Testicular volume 4-6 mL bilaterally²

Exclusion Criteria:

• • Growth spurt

  • Untreated hypothyroidism, celiac disease or steroid medication
  • Training doses > 10 hours a week
  • Use of anabolic steroids or other drugs

Only for induction of puberty for boys (testosterone) For girls estradiol is used

After the study is completed and published

Vill be shared after study published

After the study has been published