Although breast cancer in women over 50 years of age can be detected by physical examination and mammography, in our region many women of that age do not benefit from a satisfactory breast surveillance: 52.4% of women who had a general check-up between February and May 1989 have their breast examined by a physician once a year or more often; only 30% had a mammography less than three years ago; 34.2% examine themselves at least once a month. Overall, only one out of four women aged over 50 is under satisfactory breast surveillance; this small group of women is characterized by a personal history of breast disease or a family history of breast cancer. Women aged between 50 and 59 years tend to have more regular breast examination than older women. Social or geographical particularities do not seem to provide a significant explanation.