With reference to the serum level of Trx1 according to sub-type of breast cancer, it was 40.03 ± 6.793 ng/mL in lobular carcinoma of breast (BCL) and 40.22 ± 6.878 ng/mL in ductal carcinoma of breast (BCD). The gene discussed is TXN; the disease is breast lobular carcinoma.