Breast cancer in female radium dial workers first employed before 1930
Adams, E.E.; Brues, A.M.
Journal of Occupational Medicine. Official Publication of the Industrial Medical Association 22(9): 583-587
1980
ISSN/ISBN: 0096-1736 PMID: 7452380 Document Number: 162141
Female radium dial workers first employed before 1930 were analyzed for breast cancer mortality and incidence using method and rate tables described by Monson and the Mantel-Haenszel summary chi-square test for significance. Of 1,180 located women, 736 were measured to estimate radium intake. This measured group was analyzed for breast cancer mortality and incidence according to four possible risk factors: radium intake dose, duration of employment, age at first exposure, and parity. The located women had a mortality ratio of 1.51 (p < 0.05). The measured women showed a significant excess of breast cancer incidence and mortality only among those women with a radium intake of 50 microCi or greater. Although the differences were not significant, incidence and mortality ratios were slightly higher for nulliparous women.