Flight attendants and pilots face the highest risk of dying from radiation-related cancers, a new study suggests, exceeding even the risk for individuals working with radioactive materials. The research, published in JAMA Internal Medicine, analyzed over 12 million death certificates and found that airline crews had a significantly higher likelihood of mortality from cancers linked to radiation exposure.
Cosmic radiation, which originates from space, is more prevalent at higher altitudes. While limited evidence from smaller studies previously indicated a potential link between this exposure and increased cancer death rates among frequent flyers, this latest research offers substantial new data. Experts not involved in the study noted that the findings support the hypothesis that occupational radiation exposure, rather than lifestyle or socioeconomic factors, is the primary driver of these elevated risks.
Cancer Risk Analysis
Among more than 500 occupations examined, flight attendants exhibited the highest percentage of deaths from radiation-related cancers, with pilots ranking second. The study identified specific cancers tied to radiation, including leukemia, lymphoma, multiple myeloma, and cancers of the skin, breast, thyroid, prostate, and central nervous system. Both flight attendants and pilots showed unusually high odds of dying from each of these cancer types. Importantly, neither group displayed elevated death rates from cancers not associated with radiation, further bolstering the study's conclusions.
Researchers found that flight attendants had approximately 50% higher odds of dying from a radiation-related cancer compared to the general working population, while pilots had about a 36% higher risk. In absolute terms, roughly 6.9% of flight attendant deaths and 6.7% of pilot deaths were attributed to these cancers, compared to 5% in the general working population.
Study Limitations and Recommendations
Despite the significant findings, the study authors acknowledged certain limitations. They could not precisely quantify the amount of radiation exposure each individual crew member received, nor could they account for other potential contributing factors. Frequent disruption of the body's internal clock due to jet lag, time zone changes, and irregular work schedules could also exacerbate cancer risk, though this was not directly measured in the study.
The Federal Aviation Administration (FAA) has acknowledged crew exposure to ionizing radiation but does not currently set federal dose limits or mandate monitoring for aircrews. "You can't manage an exposure you've decided not to measure," stated Dr. Vishal Patel, the study's lead author from Harvard Medical School.
Union representatives highlighted the need for greater attention to radiation exposure. Sara Nelson, president of the Association of Flight Attendants-CWA, which represents 55,000 flight attendants, indicated that the report validates longstanding concerns about radiation risks. She stated that the risk is known, but crew members are often not adequately educated or informed, and responsibility for managing the risk remains unclear.
Commentary accompanying the study suggested that annual skin examinations might be beneficial for all individuals working on high-altitude flights. Additionally, women in these professions might consider earlier or more frequent mammograms. Medical professionals treating pilots and flight attendants are also advised to maintain a heightened awareness for potential cancer diagnoses in these patients.