The lifetime risk of breast cancer has increased during the 20th Century. In 1940, the risk to age 85 years was 1 in 20, about 5 percent. By 1989, the risk to age 85 years was about 1 in 9, about 11.1 percent. Today, the risk to age 85 years is about 1 in 8 or about 12.1 percent.
