Interval cancers in a French breast cancer-screening programme (Somme Department).
The objective of this study is to analyse the detection rates and tumour diameter of interval cancers in the breast cancer mass-screening programme of Somme Department (France), launched in 1990. Interval cancers are defined as breast cancers diagnosed within 36 months after a negative screening assessment, for women attending the programme between December 1990 to December 1993. Age-adjusted incidence rates were 0.51 per 1000 woman-years of follow-up in the 3-year interval after initial and subsequent screens. Diagnosis is made at early stage (sizes < or = 10 mm) in 20% of interval cancers. This stage is higher than that in screened women (9% of in situ cases and 35% of very small tumours). Interval cancer rates are low during the first year (0.18 per 1000 woman-years of follow-up) but higher in the second and third years.
Ganry
O F
OF
Epidemiology and Biostatistics Unit, University Hospital of Amiens, France. ganry.olivier@chu-amiens.fr
Peng
J
J
Raverdy
N L
NL
Dubreuil
A R
AR
D000368:Aged; D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000473:pathology* / Q000517:prevention & control*; D005260:Female; D005602:France / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D008327:Mammography; D008403:Mass Screening / Q000379:methods*; D008875:Middle Aged; D009367:Neoplasm Staging; D012042:Registries; D012680:Sensitivity and Specificity; D013997:Time Factors