In Fig. 4a, the CCR7 IOD score of mRCC patients with different baseline metastatic sites were plotted, and revealed a potential higher expression of CCR7 in patients with baseline lymph node metastasis, in accordance with the χ2 test in Table 1, though the Kruskal-Wallis test did not meet statistical significance (P = 0.083). The gene discussed is CCR7; the disease is metastatic malignant neoplasm in the lymph nodes.