Across 674 serum samples from the Singapore Longitudinal Ageing Studies (n=6,050), proteomics profiling of over 2,400 proteins identified 52 exercise-responsive proteins—termed HITs—that distinguish healthy individuals from those in a pre-cancer state, with pre-diagnostic samples collected a median 7.76 years before cancer-specific death. Crucially, both long-term unstructured vigorous activity and a short-term supervised structured intervention shifted these proteomic profiles toward healthier configurations. A distilled three-protein overlap signature retained strong discriminatory power, with directional concordance independently replicated in ~9,800 UK Biobank participants via Olink proteomics.
This work is a preprint posted on medRxiv and has not yet been peer-reviewed—findings should be interpreted with appropriate caution. That said, the study's architecture is unusually robust: two distinct exercise paradigms, a prospective cancer-free baseline design, and large-scale independent replication. What makes this genuinely compelling is the window it opens—proteins detectable nearly eight years before cancer death suggest a prolonged, potentially modifiable biological transition zone. For adults, this reframes exercise not merely as risk reduction but as a measurable molecular intervention on cancer trajectory. Key limitations include the observational design preventing causal inference, the predominantly Asian cohort limiting global generalizability, and the unknown clinical actionability of the three-protein signature. If causality is confirmed in adherence-monitored interventional trials, this could shift cancer prevention paradigms from screening to proteomically-guided exercise prescriptions—an incrementally built but potentially paradigm-shifting contribution.