Individualised vs fixed dose of oral 17β-oestradiol for induction of puberty in girls with Turner syndrome: an open-randomised parallel trial.
BACKGROUND
Oestrogen induction of pubertal changes in Turner girls may reinforce their psychological well-being and may also optimise final height; however, oestrogen type, dose, and route are not well established.


OBJECTIVE
To induce normal pubertal development in Turner girls and ovarian insufficiency with oral 17β-oestradiol (E(2)), either as individualised dose (ID) or as fixed dose (FD), and to determine whether growth is affected.


METHODS
Open-label randomised, parallel groups, multicentre clinical trial in 48 GH-treated Turner girls. Oral E(2) was given in tablets, either as an ID of 5-15 μg/kg per day during 2 years or as a FD of 0.2 mg daily during the first year followed by 0.5 mg daily during the second year. Main outcome measures were the event of attaining a Tanner breast staging ≥4 (primary), FSH, and auxological variables (secondary).


RESULTS
Shorter median time to Tanner staging ≥ B4 in the FD group (733 days) compared with the ID group (818 days) (P=0.046). Higher proportion of girls with Tanner staging ≥ B4 (65%) in the FD group compared with the ID group (42%) (P=0.068). Bone age did not show inadequate acceleration and adult height prediction was maintained in both groups. No oestrogen-related adverse events were reported.


CONCLUSIONS
Two-year treatment with oral E(2) can progressively induce normal pubertal development in Turner syndrome. Low-dose oral E(2) given as a FD produces a satisfactory pubertal development not inferior to ID. Treatment was well tolerated and did not interfere with the growth-promoting effect of GH.
Paediatric Endocrinology Unit, Hospital Infantil Universitario Miguel Servet, Paseo Isabel la Católica, 1-3, 50009 Zaragoza, Spain. jilabarta@salud.aragon.es
José I
JI
Labarta
Maria L
ML
Moreno
Juan P
JP
López-Siguero
Cristina
C
Luzuriaga
Itxaso
I
Rica
Jaime
J
Sánchez-del Pozo
Ricardo
R
Gracia-Bouthelier
D000284:Administration, Oral; D000293:Adolescent; D041923:Adolescent Development / Q000187:drug effects / Q000502:physiology; D001827:Body Height / Q000187:drug effects / Q000502:physiology; D002648:Child; D004305:Dose-Response Relationship, Drug; D004958:Estradiol / Q000008:administration & dosage* / Q000009:adverse effects; D005260:Female; D006801:Humans; D010062:Ovulation Induction / Q000379:methods*; D057285:Precision Medicine / Q000379:methods; D011627:Puberty / Q000187:drug effects* / Q000502:physiology; D013997:Time Factors; D014424:Turner Syndrome / Q000188:drug therapy* / Q000503:physiopathology
D004958:Estradiol