CXCR4 and neoplasm: Briefly, the staining intensity (weak, moderate, strong) and the number of labeled tumor cells were analyzed (Figure 7A), with the CXCR4-negative tumor samples being scored as 0 (Figure 7A, c) or 1+ (Figure 7A, d), and CXCR4-positive tumor samples classified as 2+ (Figure 7A, e) or 3+ (Figure 7A, f).