Objectives: The aim of this study was to evaluate the response to recombinant human growth hormone (rhGH) treatment in patients with Noonan syndrome (NS).
Materials And Methods: Forty-two patients (35 PTPN11+) were treated with rhGH, and 17 were followed-up until adult height. The outcomes were changes in growth velocity (GV) and height standard deviation scores (SDS) for normal (height-CDC SDS) and Noonan standards (height-NS SDS).
Results: The pretreatment chronological age was 10.3 ± 3.5 years. Height-CDC SDS and height-NS SDS were -3.1 ± 0.7 and -0.5 ± 0.6, respectively. PTPN11+ patients had a better growth response than PTPN11- patients. GV SDS increased from -1.2 ± 1.8 to 3.1 ± 2.8 after the first year of therapy in PTPN11+ patients, and from -1.9 ± 2.6 to -0.1 ± 2.6 in PTPN11- patients. The gain in height-CDC SDS during the first year was higher in PTPN11+ than PTPN11- (0.6 ± 0.4 vs. 0.1 ± 0.2, p = 0.008). Similarly, the gain was observed in height-NS SDS (0.6 ± 0.3 vs. 0.2 ± 0.2, respectively, p < 0.001). Among the patients that reached adult height (n = 17), AH-CDC SDS and AH-NS SDS were -2.1 ± 0.7 and 0.7 ± 0.8, respectively. The total increase in height SDS was 1.3 ± 0.7 and 1.5 ± 0.6 for normal and NS standards, respectively.
Conclusions: This study supports the advantage of rhGH therapy on adult height in PTPN11+ patients. In comparison, PTPN11- patients showed a poor response to rhGH. However, this PTPN11- group was small, preventing an adequate comparison among different genotypes and no guarantee of response to therapy in genes besides PTPN11.
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