Furthermore, cats presenting Luminal A, HER2-positive and TN Normal-Like mammary carcinoma subtypes revealed higher serum VEGFR-1 levels, comparing with healthy group (10197.4 ± 17679.4 pg/mL vs. 0.0 pg/mL, p = 0.011; 3068.9 ± 4935.5 pg/mL vs. 0.0 pg/mL, p = 0.048; 11527.6 ± 12845.4 vs. 0.0 pg/mL, p = 0.006; respectively, Figure 1B), as well as serum VEGFR-2 levels (2033.4 pg/mL ± 3550.7 vs. 0.0 pg/mL, p = 0.010; 502.3 ± 1091.8 pg/mL vs. 0.0 pg/mL, p = 0.046; 2023.6 ± 2416.0 pg/mL vs. 0.0 pg/mL, p = 0.005; respectively, Figure 1C). This evidence concerns the gene ERBB2 and breast carcinoma.