Trends in breast cancer incidence among women under the age of forty

Bouchardy et al (2007) reported that the Geneva Cancer Registry records show a substantial rise in breast cancer incidence in women under the age of 40 years in the period 2002–2004, and called for confirmation of their finding in other population-based cancer registries. We therefore abstracted data from the cancer registries of two other French-speaking Swiss Cantons, Vaud and Neuchâtel (Census populations (December 2000) of about 620 300 and 165 700, respectively; Levi et al, 2003a , 2003b ).