Gonadotropin-suppressive therapy in girls with early and fast puberty affects the pace of puberty but not total pubertal growth or final height.

Abstract

Early and fast puberty (EFP) in girls, defined as pubertal onset at age 8-9 yr, with an accelerated course, may cause compromised final height (FHt) and psychosocial distress. Treatment with a gonadotropin-suppressive agent is controversial, because the improvement in FHt is equivocal and there may be risk of obesity. We analyzed the data of 126 girls with EFP: 63 treated with GnRH analog (GnRHA) since Tanner stage 3, for 2-4 yr; and 63 untreated. Age at onset of puberty; accelerated time of transition from Tanner stage 2 to 3 (<1.3 yr); and clinical, hormonal and sonographic findings were similar in the 2 groups. The girls given GnRHA treatment had a significantly prolonged pubertal course, compared with the accelerated course in the untreated girls (4.7 +/- 0.4 vs. 2.45 +/- 0.4 yr, P < 0.001). After therapy, they reached Tanner stages 4 and 5 and FHt at a significantly older age than the untreated group (P < 0.001), and their menarche was delayed (12.8 +/- 0.6 vs. 10.8 +/- 0.5 yr, P < 0.001). However, the different pace of puberty in the 2 groups did not change the total pubertal growth and the bone maturation rate. The Ht gain from Tanner stage 3 to 4 (10.4 +/- 2.7 vs. 11.2 +/- 3.1 cm) and from Tanner stage 4 to FHt (8.2 +/- 2.7 vs. 8.8 +/- 3.6 cm) was similar in the treated and untreated girls, as were absolute Ht and bone age at each pubertal stage. The weight gain of the treated girls was more pronounced during treatment (P = 0.0016), but it was arrested after discontinuation of therapy; and by the time FHt was reached, the body mass index was similar in the 2 groups. The treated and untreated girls achieved a similar mean FHt, which was not significantly different from their respective mean target Ht (THt). Individual analysis revealed that 70% of the treated girls and 67% of the untreated girls attained their THt range (THt +/- 0.5 SD) or surpassed it. In conclusion, treatment with GnRHA affected only the pace of EFP. The similar Ht gain and bone maturation rate at each pubertal stage in the treated and untreated girls may suggest that the total pubertal growth is not dependent on pubertal duration and pace and is probably determined already at the onset of the normal pubertal development. The treatment did not compromise the FHt and did not cause long-lasting obesity. Therefore, GnRHA therapy may be suggested for use in girls who have psychosocial difficulties in coping with EFP.