Invasive breast cancer incidence among women 50 years old or older by receptor status, race/ethnicity, and year according to Surveillance, Epidemiology, and End Results-13. (a) Trends for ER+/PR+ breast cancer. (b) Trends for ER+/PR- breast cancer. (c) Trends for ER-/PR+ breast cancer. (d) Trends for ER-/PR- breast cancer. (e) Trends for other/unknown breast cancer. All rates are age-adjusted to the 2000 US standard. ER, estrogen receptor; PR, progesterone receptor.