 Since 2004, there is a national organized breast cancer screening OBCS programme for asymptomatic women aged 50-74 and with a medium-risk. Every two years, the local cancer screening department sends a personalized invitation mail to eligible women to perform a mammogram and a breast clinical examination. One to two reminder mails are sent to women who have not done the screening after an initial invitation. Despite this programme, almost 47 of women in France do not participate to organized breast cancer screening. 