CXCR4 and neoplasm: Cooperation of the tumour microenvironment with tumour cell growth operates through chemokine/chemokine receptor axes, such as CXCL12/CXCR4 and CCL21/CCR7, which respectively recruit immune cell populations which help the tumour growth10 and cause the dissemination of metastases in an organ‐specific manner.11, 12