This disclosure is directed, in part, to a method of determining whether a subject having cancer is at risk for developing metastasis of the cancer. In one embodiment, the method comprises (a) obtaining a biological sample from the subject having cancer； (b) determining CCR5 expression level and/or expression level of at least one of CCR5 ligands in the biological sample； and (c) if the expression level of CCR5 and/or of at least one of CCR5 ligands determined in step (b) is increased compared to CCR5 expression level and/or expression level of at least one of CCR5 ligands in a control sample, then the subject is identified as likely at risk for developing metastasis of the cancer.
