Recently, the UK Trial of Early Breast Cancer presented results after 16 years of follow-up 8 . The two screening centres offered screening by mammography and clinical examination every two years, and by clinical examination only in the intervening years. The women in the four comparison centres were identified but not offered any additional services. The cumulative breast cancer mortality rates at 16 years were not significantly different for women offered education about breast self-examination and the control group. However, the non-randomised nature of this trial means that possible confounding factors need to be considered when interpreting the results.
Recall bias is where women incorrectly recall having performed breast self-examination.
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