Furthermore, SCLC showed higher CXCR4 expression in vitro and a higher uptake (SUVmax = 13.2) of 68Ga-Pentixafor (maximum fluorescence intensity MFI = 142.0) compared to NSCLC (MFI = 120; SUVmax = 8.8). The gene discussed is CXCR4; the disease is small cell lung carcinoma.