Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists · 2022
Association of Daily Growth Hormone Injection Adherence and Height Among Children With Growth Hormone Deficiency.
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Loftus Jane, Miller Bradley S, Parzynski Craig S, Alvir Jose, Chen Yong, Jhingran Priti, Gupta Anu, DeKoven Mitch, Divino Victoria, Tse Jenny, He Jing, Wajnrajch Michael
Аннотация
OBJECTIVE: Recombinant human growth hormone (somatropin) is recommended for children with growth hormone deficiency (GHD) to normalize adult height. Prior research has indicated an association between adherence to somatropin and height velocity. Further research is needed using real-world data to quantify this relationship; hence the objective of this study was to investigate the association between adherence to somatropin and change in height among children with GHD.
METHODS: This retrospective cohort study included patients in the IQVIA PharMetrics Plus and Ambulatory Electronic Medical Records databases aged 3 to 15 years, with ≥1 GHD diagnosis code claim and newly initiated on somatropin between January 1, 2007 and November 30, 2019. Adherence was measured over the follow-up using the medication possession ratio (MPR); patients were classified as adherent (MPR ≥ 0.8) or nonadherent (MPR < 0.8).
RESULTS: Among 201 patients initiated on somatropin, 74.6% were male, mean age was 11.4 years, and the mean follow-up was 343.3 days. Approximately 76.6% of patients were adherent to somatropin over the follow-up period. Adjusted growth trajectories were similar between adherent and nonadherent patients pre-treatment initiation (P = .15). Growth trajectories post-initiation were significantly different (P = .001). On average, adherent patients gained an additional 1.8 cm over 1 year compared with nonadherent patients, adjusted for covariates.
CONCLUSION: Greater adherence to somatropin therapy is associated with improved height velocity. As suboptimal adherence to daily somatropin therapy is an issue for children with GHD, novel strategies to improve adherence may improve growth outcomes.
METHODS: This retrospective cohort study included patients in the IQVIA PharMetrics Plus and Ambulatory Electronic Medical Records databases aged 3 to 15 years, with ≥1 GHD diagnosis code claim and newly initiated on somatropin between January 1, 2007 and November 30, 2019. Adherence was measured over the follow-up using the medication possession ratio (MPR); patients were classified as adherent (MPR ≥ 0.8) or nonadherent (MPR < 0.8).
RESULTS: Among 201 patients initiated on somatropin, 74.6% were male, mean age was 11.4 years, and the mean follow-up was 343.3 days. Approximately 76.6% of patients were adherent to somatropin over the follow-up period. Adjusted growth trajectories were similar between adherent and nonadherent patients pre-treatment initiation (P = .15). Growth trajectories post-initiation were significantly different (P = .001). On average, adherent patients gained an additional 1.8 cm over 1 year compared with nonadherent patients, adjusted for covariates.
CONCLUSION: Greater adherence to somatropin therapy is associated with improved height velocity. As suboptimal adherence to daily somatropin therapy is an issue for children with GHD, novel strategies to improve adherence may improve growth outcomes.