Cancer is not a single disease but a family of disorders defined by uncontrolled cellular growth, genomic instability, and progressive invasion. It is both biological inevitability and environmental consequence - shaped by ageing, exposure, behaviour, and inequity.

In this episode of Medlock Holmes: Global Public Health, Holmes examines the epidemiological and structural dimensions of cancer as a global health challenge.

We explore:

• Global burden and rising incidence• The epidemiological transition and ageing populations• Major cancers worldwide - lung, breast, colorectal, prostate, liver, cervical• Behavioural risk factors - tobacco, alcohol, diet, physical inactivity• Infectious causes - HPV, HBV, HCV• Environmental and occupational carcinogens• Screening and early detection strategies• Vaccination as cancer prevention• Palliative care and survivorship

Cancer reveals the interface between molecular mutation and societal structure. Tobacco policy, vaccination coverage, occupational regulation, and screening infrastructure all shape cancer incidence and mortality.

Holmes traces how prevention, early detection, and system design determine whether cancer becomes a death sentence or a chronic condition.

The investigation is not into rogue cells alone - but into the environments that permit them to thrive.

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Key Takeaways

• Cancer burden is rising globally, particularly in ageing populations• A significant proportion of cancers are preventable• Tobacco remains the single largest preventable cause• Infection-related cancers represent major prevention opportunities• Screening and early detection significantly reduce mortality• Health system capacity determines survivorship outcomes• Inequities strongly influence cancer burden and access to care

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