The X-tile program (Yale University, CT, USA) was used to determine cut-points to divide the samples into low/negative, moderate and high groups using a H-score of 0–3 (low; 39%), 3–90 (moderate; 41%) and 90–300 (high; 20%) for expression of CXCL12 in tumours. The gene discussed is CXCL12; the disease is neoplasm.