Cancer Research UK has launched a new campaign to raise awareness of the importance of cancer screening.
All women aged between 50 and 60 years living in the UK are entitled to breast mammograms, but currently only a quarter of those invited attend screening appointments.
The "Screening Matters" campaign aims to get another three million people into screening programmes for breast, cervical and bowel cancer.
In the run up to Breast Cancer Awareness Month, the focus is on breast cancer.
Cancer Research UK say screening can reduce the breast cancer death rate by up to a quarter in women within the screening age range.
The charity is asking people to pledge their support by signing a card or signing up online and hopes they will agree to attend screening and encourage friends and family to do the same.
Executive Director of Policy at Cancer Research UK, Maxine Taylor, said: "Screening has a hugely important role to play in the effective prevention and treatment of cancer and in reaching many of the charity's goals in beating the disease.
"The current estimate that for every 500 women who have breast screening, one life will be saved. I hope this figure will help to show those not attending screening that doing so could be the best decision they ever made."
"I most certainly do encourage women to attend breast cancer mammograms. Yes, I do follow my own advice but what happens when your GP ignores your request for a mammogram saying you are under 50 and NHS mammography doesn't start until 50, you end up with advanced breast cancer. What can you do for the under 50s? There are over 8,000 women under 50 with breast cancer and the only way we can get into the system is by seeing a GP. The system needs to be far more accessible. Quite honestly, the system stinks" - Jeannie Erskine, Scotland