The quality of breast cancer screening programmes in Switzerland varies from canton to canton. However, according to a study published on Tuesday, the results align with the European standard. Fourteen cantons invite all women between the ages of 50 and 69 (50 to 74 in nine cantons) to a mammography screening programme every two years. Screening can also occur outside a public health programme, through so-called opportunistic screening, which is the only option in the twelve cantons without a public programme. +Get the most important news from Switzerland in your inbox The results of these programmes have been regularly monitored since 2010 to ensure quality. The study published on Tuesday by the University Centre for General Medicine and Public Health (Unisanté) in Lausanne was conducted on behalf of the Swiss Cancer Screening Association. The study is based on three million anonymised data sets of screening tests carried out in ten programmes in fourteen cantons (Vaud, Valais ...