Adult Height in Girls with Central Precocious Puberty with Onset after 6 Years: Effects of Gonadotropin-releasing Hormone Analog Therapy.

Introduction: Precocious puberty (PP), which is sometimes divided into gonadotropin-dependent or gonadotropin-independent precocious puberty, is a pathological condition characterized by premature secretion of gonadal steroids resulting in the early development of secondary sexual characteristics. Girls younger than 6 years with idiopathic gonadotropin-dependent precocious puberty (referred to as central PP or CPP) who receive gonadotropin-releasing hormone analog (GnRHa) therapy experience an increase in their adult height (AH) in contrast to girls who are aged 6 years or more, who show no consistent pattern of increase even with GnRHa therapy.

Methods: In total, 133 girls aged 6 years or more who visited any one of the seven study centers between April 2000 and March 2020 and who met the diagnostic criteria for PP in Japan were retrospectively examined. The participants were divided into a treatment (n=56) and no-treatment group (n=77). The AH and target height (TH) were compared between the groups, and the factors influencing the AH were examined.

Results: The patients receiving GnRHa therapy achieved significantly greater increase in their AH, AHTH, and predicted adult height at the age of 6, 7, and 8 years (6 ≦ years < 9) than those without the treatment. The TH and height at the start and end of treatment influenced the AH of the former group.

Conclusion: GnRHa therapy was effective in improving the AH in girls with CPP onset at the age of 6, 7, or 8 years. The TH was a strong determinant of the AH.