During the median 16 years of follow - up, study participants were assessed for the development of invasive breast cancer, and cancer cases were evaluated for estrogen receptor (ER) positivity. (sciencedaily.com)
Her sister was diagnosed with invasive breast cancer in 1999. (bwglaw.com)
For each year of breast - feedings, a mother reduces her risk of developing invasive breast cancer by six percent. (onlinedegrees.bradley.edu)