Figure 1.

Estimating overdiagnosis rates in black and white non-Hispanic patients with papillary thyroid cancer or estrogen/progesterone receptor positive breast cancer. A) Equations used for estimation of overdiagnosis rates. B) Example scenarios of cancer incidence in two populations (population 1 and population 2) with differing underlying rates of overdiagnosis. In scenario I, more overdiagnosis in population 1 creates the appearance of more advanced disease in population 2, when it is in fact unchanged in absolute terms.