A study published in Nature Medicine has found a connection between early-onset cancer biological aging acceleration and rising cancer rates in adults under 55, with younger generations showing measurably older biological profiles than their predecessors did at the same chronological age.
The research, led by a team at WashU Medicine, drew on data from more than 154,000 young adults in the UK Biobank and more than 10,000 participants in the US National Institutes of Health’s All of Us Research Program. The scale of the datasets gives the findings a breadth that single-cohort studies rarely achieve, though the researchers are careful about causal claims.
What the data actually showed
The team measured two distinct forms of biological aging. Systemic aging captures how the body is ageing overall, assessed through established clinical biomarker approaches including PhenoAge and the Klemera-Doubal Method, as well as a metabolomic age score. Organ-specific aging estimates how quickly individual biological systems are ageing, derived from blood proteomic data measuring protein levels associated with particular organs.
Using those measures, the researchers calculated the average difference between biological and chronological age within each birth cohort, then used standard deviation to gauge how far each group sat from the overall study average. The generational gaps were apparent in both populations. Among UK participants, people born between 1965 and 1974 had systemic aging 23% of one standard deviation higher than those born between 1950 and 1954, after accounting for chronological age. The US data showed a larger shift: participants born between 1990 and 1999 had systemic aging 92% of one standard deviation higher than those born between 1965 and 1969.
The association with early-onset cancer biological aging then came into clearer focus. Greater systemic aging was linked to an 8% increased risk of early-onset solid cancers, with the strongest associations for lung, gastrointestinal, and uterine cancers. When participants were split into three groups by level of systemic aging, those with the most advanced aging had a 15% higher risk of early-onset solid cancer compared with those showing the least. That association held even after the researchers accounted for inherited genetic cancer risks and genetic susceptibility to accelerated aging.
Organ-specific patterns in early-onset cancer biological aging
Not every organ system aged at the same rate, and the organ-specific findings carry their own implications. Advanced immune system aging was associated with a higher risk of early-onset lung cancer. Advanced adipose tissue aging was linked to a higher risk of early-onset colorectal cancer. The precision of these associations is what researchers hope to eventually use clinically, though that application remains at the investigative stage.
Yin Cao, a molecular epidemiologist and associate professor of surgery and of medicine at WashU Medicine, has previously studied factors including obesity, metabolic dysregulation, alcohol consumption, sedentary behaviour, poor diet quality, and caesarean delivery as contributors to cancer risk. The conclusion from that body of work is that no single factor explains much of the overall trend. Biological age acceleration, the team argues, may offer a broader composite measure of how multiple influences accumulate over time.
‘Our ultimate goal is to decode how modern environments become biologically embedded to drive cancer risk, transforming prevention from broad recommendations to personalised interventions,’ Cao said. ‘This brings us closer to identifying risk earlier and developing prevention strategies that are tailored to an individual’s biology.’
The study was conducted as part of Team PROSPECT, supported by Cancer Grand Challenges, an international research funding initiative co-founded by Cancer Research UK and the National Cancer Institute. David Scott, director of Cancer Grand Challenges, noted that the findings suggest cancer may be influenced ‘not just by changes inside individual cells, but by wider changes happening across the body as a whole.’
The researchers’ next phase focuses on determining how changes in environment, lifestyle, and society leave long-lasting biological marks. Cao and her colleagues say the goal is not only to understand why cancer develops earlier, but to identify people at elevated risk while they are still healthy, making earlier screening and personalised prevention possible. The journal reference for the study is: Tian et al., Nature Medicine, 32(8): 2983, DOI: 10.1038/s41591-026-04448-w.
