TFRC and metastatic malignant neoplasm in the lymph nodes: In addition, a trend of an increased TFR-1 expression from healthy mammary glands (mean 40.07 ± SD 38.95) to feline mammary carcinomas without lymph node metastasis (mean 78.72 ± SD 29.41) and to feline mammary carcinomas with lymph node metastasis (mean 112.28 ± SD 40.51) was also evident.