Does mammographic density predict survival in women with invasive breast cancer? The need to account for potential confounding from cancer stage and overdiagnosis.

• The negative findings from the linked study suggest breast density may not affect prognosis after a breast cancer diagnosis. • Cancer stage and overdiagnosis are potential confounders of the relationship between breast density and health outcomes. • The prognostic value of changes in mammographic density over time may be explored in future research.