Marta Temido· S&D

Confirmed

At least 40% of all cancer cases could be prevented with adequate measures

Omissions

• The WHO states a broader range of 30-50% as preventable, not just 'at least 40%'. The 40% figure represents the upper end of more recent specific estimates, while the WHO's general position is the 30-50% range.
• The February 2026 WHO report specifically states 'up to four in ten' (40%) could be prevented, which supports but slightly narrows the claim.

Sources

• PrimaryWorld Health Organization - Cancer PreventionBetween 30–50% of all cancer cases are preventable
• PrimaryWorld Health Organization - Four in ten cancer cases could be prevented globallyUp to four in ten cancer cases worldwide could be prevented (approximately 40%)
• PrimaryWorld Health Organization - Cancer Health TopicsBetween 30% and 50% of cancer deaths could be prevented by modifying or avoiding key risk factors