from Abstracts in Hematology & OncologyTM
Huang WY, Newman B, Millikan RC, et al. Am J Epidemiol. 2000;151:703-714.
We examined risk factors for subgroups of breast cancer characterized by estrogen receptor (ER) and progesterone receptor (PR) status using data from the Carolina Breast Cancer Study, a population-based, case-control study of 862 breast cancer patients aged 20 to 74 years in whom breast cancer was diagnosed between 1993 and 1996 and 790 controls who were frequency-matched based on race and age.
The majority of ER and PR statuses were retrieved from medical records (80%) or were determined in the study authors' laboratory (11%). ER and PR data were missing for 9% of cases. The receptor status distribution was as follows: 53% ER-positive/PR-positive, 11% ER-positive/PR-negative, 8% ER-negative/PR-positive, and 28% ER-negative/PR-negative.
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