The detectability of breast cancer by screening mammorgraphy.
We reviewed 134 patients with breast cancer (screen detected=85, interval=49) who had been reported as negative at previous mammographic screening in the Florence District Programme.
At prior mammograms review, 12% of the cases were classified as « screening error » (suspicious signs missed owing to misperception or poor imaging technique), 26% as « minimal signs present », 54% as « radiographically occult » and 7% as « radiographically occult at diagnosis ».
These results are quite consistent with those recently reported for the Nijmegen screening programme.
Screening errors may be reduced either by reducing the risk of misperception (double reading) or by improving imaging quality, but this would achieve earlier detection in a minority of cancer cases.
Minimal signs of cancer were present 2 years before the diagnosis in over one-third of screen-detected cancers.
Increasing screening frequency (from biennial to annual) may advance detection time of most « screening errors » and of some cancers in the « minimal signs present » and « mammographically occult » categories, but this would almost double screening costs, and the benefit would probably be inferior to that obtained by doubling the population invited to biennial screening.
Adopting less stringent criteria for referral to diagnostic assessment would probably lead to the detection of some cases in the « minimal signs present » category.
Mots-clés Pascal : Tumeur maligne, Glande mammaire, Exploration radiologique, Mammographie, Détectabilité, Diagnostic, Dépistage, Homme, Glande mammaire pathologie, Radiodiagnostic
Mots-clés Pascal anglais : Malignant tumor, Mammary gland, Radiologic investigation, Mammography, Detectability, Diagnosis, Medical screening, Human, Mammary gland diseases, Radiodiagnosis
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0200524
Code Inist : 002B24O11. Création : 09/06/1995.