The Effects of Gonadotropin-Releasing Hormone Analog and a Combination of Gonadotropin-Releasing Hormone Analog and Recombinant Human Growth Hormone on Adult Height in Girls with Early Puberty

BACKGROUND: Early puberty (EP) is due to the activation of gonadotropin-releasing hormone (GnRH) pulse generator in lower ages; EP may be a potential cause for impairment of adult height, leading to short stature. The aim of this study was to determine the effects of GnRH analog (GnRHa) and GnRHa plus recombinant human growth hormone (rhGH) treatment on final height in healthy girls with EP. MATERIALS AND METHODS: Fifty EP girls (sexual maturity rating: 2–3) with chronological age (CA) 9.22 ± 0.56 and bone age (BA) 9.74 ± 0.59 years were treated with GnRHa (Triptorelin) at a dose of 100 μg/kg body weight (BW) as intramuscular every 28 days for 2.82 ± 0.57 years; 45 EP girls with CA 9.84 ± 0.57 and BA 10.14 ± 1.02 years were also treated with the same GnRHa plus rhGH (Norditropin) at a dose of 0.1 unit/kg BW daily for 6 days in a week for 2.55 ± 0.6 years. In the control group, 33 EP girls followed for the same period without treatment. Height, weight, and body mass index of girls and parents were assessed. Predicted adult height (PAH) at the start and the end of the study and target height were assessed. RESULTS: PAH at the end of the study in the GnRHa group was not different with untreated girls. PAH at the end of the treatment in GnRHa plus rhGH group was significantly higher than both untreated and GnRHa group. PAH at the end of therapy in GnRHa plus rhGH group was significantly more than their target height. CONCLUSION: GnRHa therapy has a benefit effect in achievement of target height. Combination therapy with GnRHa plus rhGH increased their PAH more than both untreated and GnRHa groups.