[68Ga]Pentixafor PET imaging of MM xenografts Real‐time PCR analysis of cxcr4 transcript expression levels in HeLa (negative control) and in MM cell lines.

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[68Ga]Pentixafor PET imaging of MM xenografts Real‐time PCR analysis of cxcr4 transcript expression levels in HeLa (negative control) and in MM cell lines MM.1S and OPM‐2. [68Ga]Pentixafor PET imaging of MM xenografts Real‐time PCR analysis of cxcr4 transcript expression levels in HeLa (negative control) and in MM cell lines MM.1S and OPM‐2. Shown is the mean relative expression ± SEM (n = 3 independent experiments). Values are normalized to the expression of ubiquitin (Ub). The asterisk indicates statistically significant differences (HeLa vs MM.1S: P < 0.001; HeLa vs OPM‐2: P < 0.0001; Student's t‐test). CXCR4 protein expression assessed by immunoblotting (one representative blot out of 3 is shown). Binding of [68Ga]Pentixafor to MM.1S and OPM‐2 cells after the indicated incubation periods (n = 3 per cell line and time point). Shown is the mean ± SEM. The difference between the OPM‐2 groups is statistically significant; *P < 0.0017 (one‐way ANOVA). Mean tumor‐to‐background ratio (TBR) for [18F]FDG (left) and for [68Ga]Pentixafor (right) in MM.1S and OPM‐2 xenograft‐bearing NOD SCID mice. Shown is the mean ± SEM, n = 8 tumors (4 mice); *P = 0.0111 for [18F]FDG and *P = 0.0113 for [68Ga]Pentixafor (Student's t‐test). One‐way ANOVA revealed significant differences between the groups; P < 0.0001 (not graphically shown). Representative [68Ga]Pentixafor PET images of three mice bearing MM.1S (right shoulder) and OPM‐2 (left shoulder) tumors. Flow cytometric quantification of CXCR4 cell surface expression on resected MM.1S and OPM‐2 tumors. Data are the mean ± SEM, n = 4. *P = 0.0286; Mann–Whitney U‐test. Correlation of [68Ga]Pentixafor PET mean TBR and CXCR4 cell surface expression assessed by flow cytometry. n = 8 tumors were analyzed. Mice (n = 4) bearing OPM‐2 and MM.1S xenografts were coinjected with AMD3100 (right image, one representative mouse) or not pretreated (left image) before undergoing [68Ga]Pentixafor PET. The white arrows point to the bladder. Quantification is shown in Supplementary Fig S3A. Source data are available online for this figure. Kathrin Philipp‐Abbrederis et al. EMBO Mol Med. 2015;emmm.201404698 © as stated in the article, figure or figure legend