CXCL12 and ovarian cancer: To contribute to the controversial discussion about the influence of HER2/neu overexpression on ovarian cancer prognosis and whether the chemokine receptor system SDF-1/CXCR4 is significantly involved in this process, we examined the expression of these three potential oncoproteins by means of immunohistochemistry on tissue microarrays comprising 148 ovarian cancer patients.