Trends in age-standardized invasive breast cancer incidence rates among women 40 years old and above. (a) Trend by estrogen receptor status (1990 to 2003). (b) Trend by progestin receptor status (1990 to 2003). Solid lines represent observed rates and dashed lines fitted rates.
Jemal et al. Breast Cancer Research 2007 9:R28 doi:10.1186/bcr1672