Figure 3. Levels of Serum Leptin and Association With Early-Onset Breast Cancer (BC).

A, Serum levels of leptin in patients without BC (n = 100) and patients with BC (n = 99). B, Serum levels of leptin in Black and White women (n = 50 each for non-BC group and n = 53 and 46 for the BC groups, respectively. C, Distribution of leptin levels between Black and White women in patients with BC. D, Association of leptin levels with BC incidence among the early age group (aged <45 years) between Black and White women.