The benefits of breast cancer screening are vastly overestimated as the figures do not back them up in practice, scientists who conducted an in-depth review of principal trials have said.

The benefits of breast cancer screening are vastly over- estimated as the figures do not back them up in practice, scientists who conducted an in-depth review of principal trials have said.

People who take vitamin D supplements in the belief that they protect against heart disease and cancer may be wasting their time, a study suggests.