Key result
Higher circulating IGF-I concentration was positively associated with carpal tunnel syndrome (HR 1.12 per 5 nmol/l increase) and inversely associated with varicose veins, cataracts, and diabetes.
Why the study?
While circulating IGF-I is linked to higher cancer risk, little is known about its association with non-cancer outcomes.
Does higher circulating IGF-I concentration affect the risk of 25 common conditions in middle-aged adults?
Cohort (n=318,749)
Yes
Does higher circulating IGF-I concentration affect the risk of 25 common conditions in middle-aged adults?
Hazard Ratio: 1.12 (95% CI 1.08–1.16)
p-value: p=<0.002
Higher circulating IGF-I concentration is associated with an increased risk of carpal tunnel syndrome and a decreased risk of varicose veins and iron deficiency anemia, while inverse associations with cataracts and diabetes may be driven by reverse causality.
May guide IGF-I research in CTS and related conditions; should not yet change practice or imply causality.
While there is strong epidemiological evidence that circulating insulin-like growth factor-I (IGF-I) is associated with a higher risk of several cancers, little is known about its association with non-cancer outcomes. We investigated associations of circulating IGF-I with risk of 25 common conditions, other than cancer, in a large British cohort. Study participants were 318,749 middle-aged adults enrolled in the UK Biobank Study. Serum IGF-I concentration was measured in samples collected at baseline (2006-2010), and re-measured in 12,334 participants after an average of 4.3 years. We followed-up participants over an average of 11.5 years by linking to hospital admissions and mortality registries. Multivariable-adjusted Cox regressions estimated hazard ratios (HRs) and 95% confidence intervals (CIs) for associations between circulating IGF-I and 25 common conditions, using the repeated IGF-I measurements to correct for regression dilution bias. After correction for multiple testing (P < 0.002), IGF-I was positively associated with carpal tunnel syndrome (HR per 5 nmol/l higher concentration = 1.12, 95% CI 1.08-1.16), and inversely associated with varicose veins (0.90, 0.85-0.95), cataracts (0.97, 0.95-0.99), diabetes (0.92, 0.90-0.95), and iron deficiency anaemia (0.90, 0.86-0.93). The associations for cataracts and diabetes attenuated when restricted to cases diagnosed after five or more years of follow-up, suggesting that these associations were likely affected by reverse causality. Higher IGF-I concentration might be associated with the risk for several conditions, but genetic studies are needed to clarify which associations may be causal.
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Papier et al. (2021) conducted a cohort in 25 common conditions (non-cancerous) (n=318,749). Circulating insulin-like growth factor-I (IGF-I) vs. Lower IGF-I concentration was evaluated on Carpal tunnel syndrome (HR 1.12, 95% CI 1.08-1.16, p=<0.002). Higher circulating IGF-I concentration was positively associated with carpal tunnel syndrome (HR 1.12 per 5 nmol/l increase) and inversely associated with varicose veins, cataracts, and diabetes.
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