CXCR4 and small cell lung carcinoma: Through mIF staining of tumor tissues from the SCLC patients (the high uptake group) and NSCLC together with TNBC patients (the low uptake group), we observed that the high uptake group had a significantly higher level of CXCR4 expression than the low uptake group (NSCLC and TNBC) (Figure 7A-D), which corresponded to the positive correlation between IHC analysis of CXCR4 expression and tracer uptake in SCLC patients (Figure 7F-H).