Professor Arnold Hill:

International figures published show that approximately 1.6% of women who have been through a symptomatic service where they re-present within 18 months will develop a cancer.

In a small minority of those there will have been something on the mammogram. It is not a perfect test. If ten people are asked to look at a mammogram one or two might say that in hindsight now that he or she knows the person has breast cancer perhaps that vague shadow could have been considered. It is not a perfect test. It is really important that is understood. It is the best test we have but it is not perfect.