Lung, Laryngeal and Other Respiratory Cancer Incidence among Japanese Atomic Bomb Survivors: An Updated Analysis from 1958 through 2009.
The Life Span Study (LSS) of Japanese atomic bomb survivors is comprised of a large, population-based cohort offering one of the best opportunities to study the relationship between exposure to radiation and incidence of respiratory cancers. Risks of lung, laryngeal and other cancers of the respiratory system were evaluated among 105,444 LSS subjects followed from 1958 to 2009. During this period, we identified 2,446 lung, 180 laryngeal and 115 other respiratory (trachea, mediastinum and other ill-defined sites) first primary incident cancer cases. Ten additional years of follow-up, improved radiation dose estimates, revised smoking data, and updated migration information were used to investigate the joint effects of radiation and smoking using Poisson regression methods. For nonsmokers, the sex-averaged excess relative risk per Gy (ERR/Gy) for lung cancer (at age 70 after radiation exposure at age 30) was estimated as 0.81 (95% CI: 0.51, 1.18) with a female-to-male ratio of 2.83. There was no evidence of curvature in the radiation dose-response relationship overall or by sex. Lung cancer risks increased with pack-years of smoking and decreased with time since quitting smoking at any level of radiation exposure. Similar to the previously reported study, which followed cohort members through 1999, the ERR/Gy for lung cancer was significantly higher for low-to-moderate smokers than for heavy smokers, with little evidence of any radiation-associated excess risk in heavy smokers. Of 2,446 lung cancer cases, 113 (5%) could be attributed to radiation exposure. Of the 1,165 lung cancer cases occurring among smokers, 886 (76%) could be attributed to smoking. While there was little evidence of a radiation effect for laryngeal cancer, a nonsignificantly elevated risk of other respiratory cancers was observed. However, significant smoking effects were observed for both laryngeal (ERR per 50 pack-years = 23.57; 95% CI: 8.44, 71.05) and other respiratory cancers (ERR per 50 pack-years = 1.21; 95% CI: 0.10, 3.25).
a   Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland.
Elizabeth K
EK
Cahoon
c   Hirosoft International, Eureka, California.
Dale L
DL
Preston
d   Division of Biostatistics, Department of Public Health and Preventive Medicine, Oregon Health and Sciences University, Portland, Oregon.
Donald A
DA
Pierce
b   Radiation Effects Research Foundation, Hiroshima and Nagasaki, Japan.
Eric
E
Grant
a   Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland.
Alina V
AV
Brenner
a   Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland.
Kiyohiko
K
Mabuchi
b   Radiation Effects Research Foundation, Hiroshima and Nagasaki, Japan.
Mai
M
Utada
b   Radiation Effects Research Foundation, Hiroshima and Nagasaki, Japan.
Kotaro
K
Ozasa
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D007564:Japan / Q000453:epidemiology; D008017:Life Expectancy / Q000639:trends*; D008297:Male; D008875:Middle Aged; D009381:Neoplasms, Radiation-Induced / Q000401:mortality*; D054043:Nuclear Weapons / Q000706:statistics & numerical data*; D016016:Proportional Hazards Models; D000069079:Radiation Exposure / Q000706:statistics & numerical data*; D012142:Respiratory Tract Neoplasms / Q000401:mortality*; D012307:Risk Factors; D017678:Sex Distribution; D016019:Survival Analysis; D017741:Survivors / Q000706:statistics & numerical data*; D055815:Young Adult