July 1, 2014 — Commencing Jan. 1, 2015, breast density information must be included in a patient's mammography reporting results in Missouri.
A density reporting bill was first introduced in 2010 by Rep. Sue Allen, after Missouri resident Lori Jackson shared her story of missed and delayed breast cancer. Jackson’s cancer went from stage 0 to 4 within one month due to dense breast tissue. Jackson testified at a public hearing, but the bill never proceeded to a chamber vote. Tragically, Jackson passed away in October 2012.
Rep. Allen reintroduced the bill this session inspired by Missouri residents Kathy Brown and Patty Richard.
"Too many women are unaware of the effects of breast density, but this knowledge can save lives by leading to earlier breast cancer detection," noted Rep. Allen.
Richard, a Joplin, Mo., resident who attended the historic signing added, "Without this information, women cannot discuss the risk of dense breast tissue and the possible benefits of supplemental screening with their doctors."
"This is a bitter sweet moment as we honor Lori's advocacy for dense breast tissue notification. Her pioneering efforts in Missouri led to the enactment of this law. In her own words, ‘Education is the best way to be your own advocate,’” reported Nancy Cappello, founder & director of Are You Dense Inc. and Are You Dense Advocacy Inc.
February 18, 2026 
