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Insulin-Like Growth Factor-I and Growth in Height, Leg Length, and Trunk Length between Ages 5 and 10 Years

Unit of Paediatric and Perinatal Epidemiology (I.R., P.E.), Department of Community-Based Medicine, University of Bristol, Bristol BS8 1TQ, United Kingdom; Department of Social Medicine (C.M., D.G.), University of Bristol, Bristol BS8 2PR, United Kingdom; Department of Paediatrics (D.D.), University of Cambridge, Addenbrookes Hospital, Cambridge CB2 2QQ, United Kingdom; and Division of Surgery (J.H.), University of Bristol, Bristol, BS8 2HW, United Kingdom

Address all correspondence and requests for reprints to: Imogen Rogers, Unit of Paediatric and Perinatal Epidemiology, Department of Community-Based Medicine, University of Bristol, 24 Tyndall Avenue, Bristol BS8 1TQ, United Kingdom. E-mail: imogen.rogers{at}bristol.ac.uk.

Objective: IGF-I, a major regulator of childhood growth, is also associated with the risk of several cancers in adult life. Adult height and particularly leg length are also associated with cancer risk. Prepubertal growth is more in leg than trunk length, and it has been suggested that leg length might be a biomarker of childhood IGF-I. However, there is little information on the association between childhood IGF-I and subsequent leg and trunk growth. In this study, we investigated the association of IGF-I measured at 5 and 7–8 yr with growth in height and the components of height (leg and trunk length) from 5 yr to 9–10 yr.

Participants: A total of 675 children participated in the Avon Longitudinal Study of Parents and Children.

Results: IGF-I was strongly positively associated with growth in height in both sexes. Among boys, IGF-I was strongly associated with subsequent growth in both leg and trunk length, but there was no evidence that IGF-I was more strongly associated with one component of growth than the other. Among girls, IGF-I was strongly positively associated with growth in trunk but not leg length, although there was only weak evidence that these two associations differed in strength (P = 0.058).

Conclusions: These results support the contention that the associations between height and cancer may be mediated by variation in childhood IGF-I. However, they provide no evidence to support the hypothesis that leg length is a better biomarker of childhood IGF-I levels than trunk length.

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