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Important Research Findings
| Smoking cigarettes before first childbirth increases risk of breast cancer
(2007
) | | | We evaluated breast cancer risk associated with cigarette smoking during different periods of reproductive life among radiologic technologists who completed the first and second study questionnaires. After accounting for age, birth cohort, and established breast cancer risk factors, we found that smoking-related breast cancer risks differed by smoking during three reproductive time periods, with a statistically significant 3% increase per pack-year smoked between menarche and first childbirth and no significant association for smoking after first childbirth. Risk also increased with younger age started smoking.
| | | [Abstract] [PubMed] | | | | Breast cancer incidence in U.S. radiologic technologists
(2006
) | | | Among female radiologic technologists who completed the first and second study questionnaires, 1050 new breast cancers occurred between 1983 and 1998. We evaluated breast cancer risk according to employment characteristics and a 4-level proxy index for cumulative radiation exposure. Women who began working as a radiologic technologist before 1940 had a statistically significant 2-fold risk compared to women who began working in 1970 or later, and risk increased significantly with increasing number of years worked before 1940. Breast cancer risk was not related to working as a radiologic technologist in the 1940s or later. Women in the highest exposure group (level 4) had a 50% greater breast cancer risk than those in the lowest exposure group.
| | | [Abstract] [PubMed] | | | | Breast cancer among radiologic technologists
(1995
) | | | Among 79,000 female radiologic technologists who completed the first survey in the mid-1980s, 528 technologists reported an eligible breast cancer. We compared the 528 breast cancer cases with a similar group of 2,628 technologists who did not have breast cancer. Consistent with other studies, we found higher breast cancer risks for technologists who started menstruating at an early age (<11), never had children, had a first-degree family relative with breast cancer, had a prior breast biopsy (at least one year before breast cancer diagnosis), consumed more than 14 alcoholic drinks per week, and resided in the northeastern United States. Breast cancer risk was not related to total number of years worked as a radiologic technologist, nor with jobs involving radiotherapy, radioisotopes, or fluoroscopy. Personal medical radiation exposures from fluoroscopic or multi-film procedures also did not affect risk.
| | | [Abstract] [PubMed] | | | | Employment practices and breast cancer among radiologic technologists
(1995
) | | | In further analyses, we found that breast cancer risk did not differ according to the types of procedures radiologic technologists performed or the number of years they worked with these procedures. The procedures that we evaluated were fluoroscopy, portable radiograph, routine radiograph, multi-film procedure, dental x-ray, radium therapy, orthovoltage, cobalt-60, betatron, other radiograph teletherapy, other radioisotope therapy, diagnostic radioisotope, microwave/ultrasound diathermy, diagnostic ultrasound, and CAT scan.
| | | [Abstract] [PubMed] | | |
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