Tim Key

Tim Key is Professor of Epidemiology at the University of Oxford's Cancer Epidemiology Unit within the Nuffield Department of Population Health, with college affiliation at Wolfson College. Having worked at Oxford since 1985, his research focuses on diet, hormones, and cancer etiology—particularly for breast, prostate, and colon cancers—and the health implications of vegetarian/vegan diets.

His academic credentials include:

• BVM&S (Bachelor of Veterinary Medicine and Surgery)
• MSc (Master of Science)
• DPhil (Doctor of Philosophy)

Professor Key's research integrates large-scale epidemiological studies with biochemical analyses to identify modifiable cancer risk factors. As Principal Investigator of the EPIC-Oxford cohort (60,000 participants, 30,000 non-meat eaters), he investigates long-term dietary impacts on cancer development. His coordination of the Endogenous Hormones and Breast Cancer Collaborative Group enables pooled international data analysis to clarify hormonal mechanisms in breast cancer. Current work emphasizes metabolomic and genetic approaches to uncover pre-diagnostic biomarkers and causal pathways.

His 2025 publications reveal concentrated expertise in nutritional cancer epidemiology and biomarker discovery. Key themes include dietary components' relationships with stroke subtypes, alcohol/smoking effects on liver cancer, and metabolomic changes preceding prostate cancer diagnosis. Methodologically, his work leverages prospective cohort designs, case-control analyses within EPIC, and genetic studies to establish temporal relationships between exposures and cancer outcomes.

No specific scientific awards are mentioned in the source material, though his sustained leadership in major international consortia indicates significant recognition.

Professor Key manages substantial research funding through his roles as EPIC-Oxford Principal Investigator and Endogenous Hormones Collaborative Group Coordinator. These positions involve directing multi-institutional teams, securing competitive grants for longitudinal cohort maintenance, and facilitating global data-sharing agreements for hormone and metabolomics research.

He leads the Cancer Epidemiology Unit's research program, which operates within Oxford's Nuffield Department of Population Health. Current initiatives include long-term follow-up of the EPIC-Oxford vegetarian cohort, metabolomic profiling of pre-diagnostic blood samples, and collaborative hormone analyses across 26 international studies. The unit maintains infrastructure for dietary assessment, biomarker processing, and statistical analysis of large epidemiological datasets.