68Ga-FAPI PET/CT: Tracer Uptake in 28 Different Kinds of Cancer

医学 核医学 癌症 胰腺癌 前列腺癌 原发性肿瘤 转移 内科学
作者
Clemens Kratochwil,Paul Flechsig,Thomas Lindner,Labidi Abderrahim,Annette Altmann,Walter Mier,Sebastian Adeberg,Hendrik Rathke,Manuel Röhrich,H. Winter,Peter K. Plinkert,Frederik Marmé,Matthias Lang,Hans‐Ulrich Kauczor,Dirk Jäger,Jürgen Debus,Uwe Haberkorn,Frederik L. Giesel
出处
期刊:The Journal of Nuclear Medicine [Society of Nuclear Medicine]
卷期号:60 (6): 801-805 被引量:1107
标识
DOI:10.2967/jnumed.119.227967
摘要

The recent development of quinoline-based PET tracers that act as fibroblast-activation-protein inhibitors (FAPIs) demonstrated promising preclinical and clinical results. FAP is overexpressed by cancer-associated fibroblasts of several tumor entities. Here, we quantify the tumor uptake on 68Ga-FAPI PET/CT of various primary and metastatic tumors to identify the most promising indications for future application. Methods:68Ga-FAPI PET/CT scans were requested by various referring physicians according to individual clinical indications that were considered insufficiently covered by 18F-FDG PET/CT or other imaging modalities. All PET/CT was performed 1 h after injection of 122–312 MBq of 68Ga-FAPI-04. We retrospectively identified 80 patients with histopathologically proven primary tumors or metastases or radiologically unequivocal metastatic lesions of histologically proven primary tumors. Tumor uptake was quantified by SUVmax and SUVmean (60% isocontour). Results: Eighty patients with 28 different tumor entities (54 primary tumors and 229 metastases) were evaluated. The highest average SUVmax (>12) was found in sarcoma, esophageal, breast, cholangiocarcinoma, and lung cancer. The lowest 68Ga-FAPI uptake (average SUVmax < 6) was observed in pheochromocytoma, renal cell, differentiated thyroid, adenoid cystic, and gastric cancer. The average SUVmax of hepatocellular, colorectal, head–neck, ovarian, pancreatic, and prostate cancer was intermediate (SUV 6–12). SUV varied across and within all tumor entities. Because of low background in muscle and blood pool (SUVmax < 2), the tumor-to-background contrast ratios were more than 3-fold in the intermediate and more than 6-fold in the high-intensity uptake group. Conclusion: Several highly prevalent cancers presented with remarkably high uptake and image contrast on 68Ga-FAPI PET/CT. The high and rather selective tumor uptake may open up new applications for noninvasive tumor characterization, staging examinations, or radioligand therapy.
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