Figure 7. Association of DNA methylation of TfR1 with clinicopathological parameters of BC patients. The DNA methylation of TfR1 was investigated in (A) BC patients (n = 793) and normal individuals (n = 97); female (n = 783) and male (n = 9) BC patients; patients with different BC subtypes (normal individuals, n = 97; HER2-positive, n = 17; luminal, n = 393; and TNBC, n = 84); patients with different stages of BC (normal individuals, n = 97; stage 1, n = 127; stage 2, n = 442; stage 3, n = 200; and stage 4, n = 11); patients with different nodal metastasis statuses (normal individuals, n = 97; N0, n = 233; N1, n = 242; N2, n = 95; and N3, n = 20); and patients with different ages (normal individuals, n = 97; 21–40 years, n = 73; 41–60 years, n = 374; 61–80 years, n = 306; and 81–100 years, n = 37). (B) Methylation levels of TfR1 in BC through the SurvivalMeth database. (C) The heat map of DNA methylation of TfR1 in BC. *< 0.05, **< 0.01, ***< 0.001.