Synergistic effects of obesity and type 2 diabetes on adiposity-related cancer risk across age strata

Q: What question does the study address about obesity, T2D, and cancer?

It evaluates how diagnoses of both obesity and T2D influence adiposity-related cancer incidence compared with obesity alone or T2D alone, with emphasis on age-specific patterns.

Q: How were the study groups constructed and made comparable?

The researchers performed a retrospective cohort analysis and generated three cohorts, then used propensity score matching (1:1) to balance confounders across groups.

Sep 22, 2026

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Obesity and type 2 diabetes (T2D) each raise cancer risk, yet their combined effect across ages remains insufficiently characterized. Using a retrospective real-world cohort design within the TriNetX federated database, the study compared cancer incidence among patients with obesity alone, T2D alone, and both conditions. Propensity score matching addressed confounding. Results show the highest risk when both conditions coexist, particularly for younger adults, supporting targeted screening and management for early-onset disease.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages13

Reading Time33 min

AccessFree to download

Abstract

Background

Methods

Results

Conclusions

Keywords

Henney etal. BMC Medicine (2026) 24:312 [https://doi.org/10.1186/s12916-026-04842-8](https://doi.org/10.1186/s12916-026-04842-8) BMC Medicine RESEARCH Open Access Synergistic effects of obesity and type 2 diabetes on adiposity-related cancer risk across age strata Alex E. Henney 1,2,3, Megan Heague 1, Uazman Alam1,2,3,4 and Daniel J. Cuthbertson 1,2,3* Abstract Background Obesity and type 2 diabetes (T2D) each independently increase cancer risk, but their combined impact is less understood. With rising early-onset obesity, T2D, and cancer in younger populations, we assessed how diagnoses of both obesity and T2D affect adiposity-related cancer incidence compared to each condition alone, focussing on age-specific trends. Methods We performed a retrospective (real-world) cohort analysis in a large global federated database (TriNetX, Cambridge MA, USA) . Three cohorts were generated and compared with a reference arm, patients without obesity orT2D: cohort 1—patients with obesity, without T2D; cohort 2—patients with T2D, without obesity, and cohort 3—patients with both obesity and T2D. Cohorts underwent propensity score matching (PSM) 1:1 of confounders. We examined 5-year rates of incident cancer (including thirteen (traditional) adiposity-related cancers and an expanded list of 24 adiposity-related cancers), performing stratified analyses by age (younger, middle-aged, and older adults (< 40, 40–60, > 60 years), respectively), ethnicity (white, and non-white), and sex (male and female) . Results After PSM, we compared 2,655,891 people with only obesity, 290,965 with only T2D and 705,499 people with both obesity and T2D, against the reference (1:1) . The highest risk was observed in patients with both obesity and T2D (traditional cancers (HR 1.48 [95% CI 1. 15, 1. 51]) and all adiposity-related cancers (1 .30 [1 . 27, 1. 32])) . T2D increased the risk of both traditional (1 .35 [1 . 31, 1. 39]) and all adiposity-related cancers (1 .27 [1 . 23, 1. 31]) to a greater extent than obesity only (increased risk of traditional adiposity-related cancers (1 .07 [1 . 05, 1. 09]), but not all adiposity-related cancers (0 .99 [0 . 98, 1. 01]) . Concerningly, the highest risk of all traditional and adiposity-related cancers was seen in younger (< 40 years) adults with obesity and T2D (1 .40 [1 . 10, 1. 79] and 1.58 [1 . 21, 2 . 05], respectively) . Conclusions Risk of incident adiposity-related cancer is driven most strongly by the combination of obesity and T2D, versus either alone, across all age groups, including those with early-onset disease. The impact of early-onset obesity and T2D provides a critical public health problem that demands targeted screening and management. Keywords Obesity, Diabetes, Cancer, Adiposity *Correspondence: Daniel J. Cuthbertson [dan.cuthbertson@liverpool.ac.uk](dan.cuthbertson@liverpool.ac.uk) Full list of author information is available at the end of the article © The Author(s) 2026. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit [http://creativecommons.org/licenses/by/4.0/](http://creativecommons.org/licenses/by/4.0/.)[.](http://creativecommons.org/licenses/by/4.0/.) Background The obesity pandemic has driven the incidence of numero

FAQs

What question does the study address about obesity, T2D, and cancer?

It evaluates how diagnoses of both obesity and T2D influence adiposity-related cancer incidence compared with obesity alone or T2D alone, with emphasis on age-specific patterns.

How were the study groups constructed and made comparable?

The researchers performed a retrospective cohort analysis and generated three cohorts, then used propensity score matching (1:1) to balance confounders across groups.

Which group had the highest cancer risk, and in which age group was the risk most pronounced?

The highest risk was observed in patients with both obesity and T2D, with the greatest risk among younger adults (<40 years).

Sep 22, 2026

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