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Age at type 2 diabetes diagnosis and risk of cancer: Cohort study in over 1 million individuals from the TriNetX US
Tommy Slater1, Gema Hernández Ibarburu2, Zuzanna Drebert2
1Diabetes Research Centre, University of Leicester, College of Life Sciences, Leicester General Hospital, Leicester, UK; National Institute for Health Research (NIHR) Leicester Biomedical Research Centre, Leicester, UK.
Aims:
To investigate whether the association between type 2 diabetes diagnosis and relative and absolute risk of obesity-related cancers differs based on age at diabetes diagnosis.
Methods:
This retrospective, observational cohort study used data from the US Collaborative Network within the TriNetX database. Individuals with type 2 diabetes were propensity matched - for age, sex, and ethnicity - to individuals without type 2 diabetes. Crude 5-year risks of obesity-related cancer were calculated. Cox proportional-hazards models were used to assess relative rates of obesity-related cancer incidence over five years, comparing individuals with type 2 diabetes in younger (aged ≤40 years; n = 162,691) and middle-older age (aged >40 years; n = 1,616,950), with propensity-matched cohorts without type 2 diabetes.
Results:
Absolute risk of developing cancer was greater in individuals with versus without type 2 diabetes. Relative rates of any cancer were greater in younger (HR: 2·01 [95 % CI: 1·85, 2·19]) than middle-older age adults (1·49 [1·48, 1·51]). The highest relative rates in younger adults were observed for corpus uteri (HR: 4·76 [3·51, 6·46]) and pancreatic cancer (4·25 [2·34, 7·72]). Corresponding HRs in middle-older age adults were 1·92 (1·84, 2·01) and 1·75 (1·68, 1·83).
Conclusions:
The five-year risk of cancer was higher in those with newly diagnosed type 2 diabetes versus those without. Absolute risk was greater in middle-older age adults, although relative rates were greater amongst younger adults. This persisted across most site-specific cancers, suggesting targeted strategies for early detection and prevention may help younger adults with newly-diagnosed type 2 diabetes reduce lifetime disease burden.
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