Introduction: The inhibitory effect of aromatase on predicted adult height and near final height has been studied in patients with constitutional delay of growth and puberty (CDGP). Aim: This is the first study aimed at verifying the letrozole (Lz) effect on final height of patients with CDGP. Material and Methods: In this study 8 patients with CDGP underwent treatment with Lz (2.5 mg/day) for a year, and 8 patients with CDGP, who did not receive Lz were followed up to reaching final height. Height discrepancy was calculated by subtracting PAH from final height measurement. Results: the final height for Lz and Control Groups were 171± 4.5 cm and 168.8±4.1Cm respectively. The final heights for Lz group were significantly (p=0.04) higher than the control group. Final height in comparison with PAH at the beginning of the study showed significant difference (p=0.022) in Lz group whereas the difference was not significant (p=0.8) in control group. For height discrepancy the measurements were +1.9 cm and +0.1 cm for Lz and control group respectively with significant difference (p=0.04). Conclusion: Our study, which is the first one in evaluating the impact of Lz on FH, illustrated that Lz treatment will ultimately lead to augmentation of FH in boys with CDGP.
Key words: Letrozole, Constitutional Delay of Growth, Puberty, Final Height, Treatment.
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