Breast cancer continues to be a disease with tremendous public health significance. Primary prevention of breast cancer is still not available, so efforts to promote early detection continue to be the major focus in fighting breast cancer. Since early detection is associated with decreased mortality, one would think that it is important to minimize delays in detection and diagnosis. There are two major types of delay. Patient delay is delay in seeking medical attention after self-discovering a potential breast cancer symptom. System delay is delay within the health care system in getting appointments, scheduling diagnostic tests, receiving a definitive diagnosis, and initiating therapy. Earlier studies of the consequences of delay on prognosis tended to show that increased delay is associated with more advanced stage cancers at diagnosis, thus resulting in poorer chances for survival. More recent studies have had mixed results, with some studies showing increased survival with longer delays. One hypothesis is that diagnostic difficulties could perhaps account for this survival paradox. A rapidly growing lump may suggest cancer to both doctors and patients, while a slow growing lump or other symptoms could be less obvious to them. If this is the case, then the shorter delays would be seen with the more aggressive tumors for which the prognosis is worse leading to reduced survival. It seems logical that a tumor that is more advanced at diagnosis would lead to shorter survival but the several counter-intuitive studies in this review show that it is dangerous to make assumptions.

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Results from recent studies indicate that many women in the US undergo routine screening for breast cancer, but some groups of women are under-screened. In this study, we examined the breast cancer screening practices of white and black women in the United States, according to Hispanic ethnicity and other factors, using data from the 2000 National Health Interview Survey. Among women aged > or =40 years, 71.2% (95% confidence interval, CI: 70.0-72.4%) of the 8201 white women and 67.6% (95% CI: 64.5-70.6%) of the 1474 black women in this sample reported having a mammogram in the past two years. About 60.3% (95% CI: 56.7-70.3%) of 970 Hispanic women (including those who reported they were white or black) and 71.5% (95% CI: 70.3-72.7%) of 8705 non-Hispanic women reported having a mammogram in the past two years. About 74.8% (95% CI: 73.8-76.8%) of 8176 white women and 73.8% (95% CI: 71.1-76.6%) of 1471 black women aged > or =40 years had received a clinical breast examination in the past two years. About 60.1% (95% CI: 56.1-64.0%) of 969 Hispanic women (including those who reported they were white or black) and 75.6% (95% CI: 74.6-76.6%) of 8678 non-Hispanic women had received a clinical breast examination in the past two years. Women with lower incomes, those with less education, and recent immigrants were less likely to be screened. Women who had a usual source of health care and those with health insurance coverage were more likely to have been screened. These results underscore the need for continued efforts to ensure that uninsured women and those who are medically underserved have access to cancer screening services.