Age-adjusted breast cancer incidence rates in females by age-adjusted HD incidence rates in females 15–34 years of age in 135 populations in the world (Panel A) and in 18 United States SEER populations (Panel B) with a robust locally weighted regression line. Age-adjusted breast cancer incidence rates in females by age-adjusted HD incidence rates in females 15–34 years of age in 135 populations in the world (Panel A) and in 18 United States SEER populations (Panel B) with a robust locally weighted regression line. Yutaka Yasui et al. Cancer Epidemiol Biomarkers Prev 2001;10:9-16 ©2001 by American Association for Cancer Research