Cosmic radiation and cancer mortality among airline pilots: results from a European cohort study (ESCAPE).
Level 3 - non-randomized controlled study
Non-randomized occupational cohort study with nested case-control analyses
PubMed 14648170 · doi:10.1007/s00411-003-0214-7
What was done
This European cohort study (ESCAPE) evaluated the association between cosmic radiation and cancer mortality among 19,184 male airline pilots. Individual effective occupational doses were estimated, and mortality risks were evaluated via external comparisons, internal comparisons, and nested case-control analyses.
What was found
Mean annual radiation doses ranged from 2 to 5 mSv, with cumulative lifetime doses not exceeding 80 mSv. All-cause and all-cancer mortality were low across all exposure categories. A statistically significant negative risk trend was observed for all-cause mortality with increasing radiation dose. Neither external, internal, nor nested case-control analyses demonstrated substantially increased risks for cancer mortality. Specific numerical risk estimates, hazard ratios, and confidence intervals were not reported in the abstract.
Why it matters
It provides occupational cohort data demonstrating that routine levels of cosmic radiation exposure in commercial aviation are not linked to elevated overall cancer mortality among pilots.
Limits
The study included only male pilots, limiting generalizability to female aircrew. The number of deaths for specific cancer subtypes was low, resulting in wide confidence intervals and reduced power for site-specific outcomes. The abstract lacks exact numerical risk metrics, and the authors note inherent methodological challenges in interpreting mortality risk for time-dependent exposures.
Cited by
- contradicts Airline pilots have higher rates of cancer, in part due to elevated atmospheric cosmic radiation exposure.