IARC Monographs Volume 124: Night shift work (carcinogenicity evaluation)
Summary
IARC evaluated the carcinogenicity of night shift work and classified it as probably carcinogenic to humans (Group 2A) based on limited evidence in humans and sufficient in animals.
Why It Matters For Night Shift Workers and Night Owls
This monograph how years of night‑shift exposure shows cancer risk for night‑shift workers and night owls. Evidence trends connect cumulative night exposure with risk signals, which matters over a career rather than a single block. For night‑shift teams and individuals, this ties long‑debated rota features to concrete outcomes, making schedule talk about health, not preference.
Notes
Full monograph PDF available from IARC.