Cancer incidence and adverse pregnancy outcome in registered nurses potentially exposed to antineoplastic drugs
1 School of Nursing, University of British Columbia, 302-6190 Agronomy Road, Vancouver, V6T 1Z3, Canada
2 BC Cancer Agency Research Centre, 675 West 10th Avenue, Vancouver, V5Z 1L3, Canada
3 Department of Medicine, University of British Columbia, 890 West 10th Avenue, Vancouver, BC, V5Z 1M9, Canada
4 School of Environmental Health, University of British Columbia, 2206 East Mall, Vancouver, V6T 1Z3, Canada
5 School of Population and Public Health, University of British Columbia, 5804 Fairview Avenue, Vancouver, V6T 1Z3, Canada
BMC Nursing 2010, 9:15 doi:10.1186/1472-6955-9-15Published: 16 September 2010
To determine the relationships of potential occupational exposure to antineoplastic drugs with cancer incidence and adverse pregnancy outcomes in a historical prospective cohort study of female registered nurses (RNs) from British Columbia, Canada (BC).
Female RNs registered with a professional regulatory body for at least one year between 1974 and 2000 formed the cohort (n = 56,213). The identifier file was linked to Canadian cancer registries. An RN offspring cohort from 1986 was created by linkages with the BC Birth and Health Status Registries. Exposure was assessed by work history in oncology or cancer agencies (method 1) and by estimating weighted duration of exposure developed from a survey of pharmacists and nursing unit administrators of all provincial hospitals and treatment centers and the work history of the nurses (method 2). Relative risks (RR) were calculated using Poisson regression for cancer incidence and odds ratios (OR) were calculated for congenital anomaly, stillbirth, low birth weight, and prematurity incidence, with 95% confidence intervals.
In comparison with other female RNs, method 1 revealed that RNs who ever worked in a cancer center or in an oncology nursing unit had an increased risk of breast cancer (RR = 1.83; 95% CI = 1.03 - 3.23, 12 cases) and their offspring were at risk for congenital anomalies of the eye (OR = 3.46, 95% CI = 1.08 - 11.14, 3 cases). Method 2 revealed that RNs classified as having the highest weighted durations of exposure to antineoplastic drugs had an excess risk of cancer of the rectum (RR = 1.87, 95% CI = 1.07 - 3.29, 14 cases). No statistically significant increased risks of leukemia, other cancers, stillbirth, low birth weight, prematurity, or other congenital anomalies in the RNs' offspring were noted.
Female RNs having had potential exposure to antineoplastic drugs were not found to have an excess risk of leukemia, stillbirth, or congenital anomalies in their offspring, with the exception of congenital anomalies of the eye, based on only three cases; however, elevated risks of breast and rectal cancer were observed.