Task: Answer Verification
Input (English): Question: Is cXCR4 highly expressed at the tumor front but not in the center of prostate cancers?
Answer: CXCR4 seems overexpressed at the tumor front of prostate tumors, where it potentially promotes cell migration toward the SDF-1 centrifugal attracting gradient, as well as epithelial-mesenchymal transition. High CXCR4 and low SDF-1 levels at tumor front were both associated with adverse histological features.
Output (English): yes