However, several recent studies have shown that Gal-9 can be involved in melanoma metastasis under specific conditions, and CCR7 is highly expressed in metastases from melanoma patients, where a subpopulation of CCR7+ melanoma cells was found to co-express PD-L1 and Gal-9 (Cristiani et al., 2019). The gene discussed is CCR7; the disease is melanoma.