Tumour-to-liver, tumour-to-LDM and tumour-to-spleen ratios were considerably higher in the case of HER2-positive tumours (2.8 ± 0.51, 26.1 ± 20.1 and 7.3 ± 4.02, respectively) than in HER2-negative ones (1.2 ± 0.5, 9.1 ± 3.9 and 2.4 ± 1.2, respectively) (p < 0.005, Mann–Whitney test) (Supplementary Figure S1 and Supplementary Table S2). The gene discussed is ERBB2; the disease is neoplasm.