Mammography screening allowed breast tumors detection in early stage while treatments are less aggressive. Despite the fact that organized mammography screening has been free of charge for the target population since 2004 in France, the participation rate to the programme remains low.The aim of the studies was to investigate individual and area-level socioeconomic factors explaining low breast cancer screening attendance, individual factors influencing mammography screening round adequacy and to assess the evidence of screening round adequacy in the discovery of breast tumors.The results showed that women living in most deprived areas or rural areas, those covered by self-employed insurance scheme and those living at more than 15 minutes from an accredited screening centre were less likely to attend organized breast cancer screening. Women with a regular screening and medical follow-up were more likely to be diagnosed with an early stage tumor.Attendance to mammography screening and regular medical follow up lead to have tumors discovered at an early stage, to be treated by surgery and radiotherapy and to receive less neoadjuvant chemotherapy. This supposes to be screened in the organized mammography screening programme and to have regular gynecological follow-up.
