Figure 2. The protein expression level of TfR1 in BC. (A) TfR1 expression at the protein level in BC tissues (n = 125) and normal breast tissues (n = 18) through UALCAN database. (B) TfR1 protein expression was investigated in patients with different stages of BC (normal individuals, n = 18; stage 1, n = 4; stage 2, n = 74; and stage 3, n = 32). (C) The protein expressions of TfR1 were evaluated using the HPA database. The results of IHC staining suggested that the TfR1 protein was expressed at high levels in BC tissues. *< 0.05, **< 0.01.