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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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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