Effect of social class on tumour size at diagnosis and surgical treatment in Danish women with breast cancer.

This study examines the effect of socio-economic inequalities on the tumour size at diagnosis and the choice of surgical treatment in Danish women with breast cancer. The Danish Breast Cancer Cooperative Group (DBCG) registers all women with breast cancer in Denmark and provides clinical register data on tumour size and surgical treatment for 1594 women <75 yr diagnosed with breast cancer between 1991 and 1996. A questionnaire including questions on social class was sent to the women. The tumour size at diagnosis (an indicator of access to treatment) and the surgical procedure (lumpectomy or mastectomy) for patients who were potential candidates for lumpectomy were the main outcome measures examined. Social class was not associated with tumour size at diagnosis. The tumour size was associated with age and the existence of a mammographic screening program in the county. However, treatment was strongly related to social class. Among women considered candidates for lumpectomy 77% underwent lumpectomy in the highest social class, compared to 50% in the lowest social class. Treatment was associated with age, tumour size and hospital status. It was concluded that the study showed no socio-economic inequalities related to access to health services as measured by tumour size, though significant social differences were found regarding treatment.