Finally, there was no evidence of heterogeneity in the association of IGF‐I and risk of overall lymphoma (Table 3) by sex (pheterogeneity = 0.08), age at blood collection (pheterogeneity = 0.3), time between blood collection and diagnosis (pheterogeneity = 0.9), age at diagnosis (pheterogeneity = 0.2), or BMI (pheterogeneity = 0.09). Here, IGF1 is linked to lymphoma.