Impact of Tumor Burden on Normal Organ Distribution in Patients Imaged with CXCR4-Targeted [68Ga]Ga-PentixaFor PET/CT

Sebastian E. Serfling, Constantin Lapa, Niklas Dreher, Philipp E. Hartrampf, Steven P. Rowe, Takahiro Higuchi, Andreas Schirbel, Alexander Weich, Stefanie Hahner, Martin Fassnacht, Andreas K. Buck, Rudolf A. Werner

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Background: CXCR4-directed positron emission tomography/computed tomography (PET/CT) has been used as a diagnostic tool in patients with solid tumors. We aimed to determine a potential correlation between tumor burden and radiotracer accumulation in normal organs. Methods: Ninety patients with histologically proven solid cancers underwent CXCR4-targeted [68Ga]Ga-PentixaFor PET/CT. Volumes of interest (VOIs) were placed in normal organs (heart, liver, spleen, bone marrow, and kidneys) and tumor lesions. Mean standardized uptake values (SUVmean) for normal organs were determined. For CXCR4-positive tumor burden, maximum SUV (SUVmax), tumor volume (TV), and fractional tumor activity (FTA, defined as SUVmean x TV), were calculated. We used a Spearman's rank correlation coefficient (ρ) to derive correlative indices between normal organ uptake and tumor burden. Results: Median SUVmean in unaffected organs was 5.2 for the spleen (range, 2.44 – 10.55), 3.27 for the kidneys (range, 1.52 – 17.4), followed by bone marrow (1.76, range, 0.84 – 3.98), heart (1.66, range, 0.88 – 2.89), and liver (1.28, range, 0.73 – 2.45). No significant correlation between SUVmax in tumor lesions (ρ ≤ 0.189, P ≥ 0.07), TV (ρ ≥ -0.204, P ≥ 0.06) or FTA (ρ ≥ -0.142, P ≥ 0.18) with the investigated organs was found. Conclusions: In patients with solid tumors imaged with [68Ga]Ga-PentixaFor PET/CT, no relevant tumor sink effect was noted. This observation may be of relevance for therapies with radioactive and non-radioactive CXCR4-directed drugs, as with increasing tumor burden, the dose to normal organs may remain unchanged.

Original languageEnglish
JournalMolecular Imaging and Biology
Publication statusAccepted/In press - 2022
Externally publishedYes


  • C-X-C motif chemokine receptor 4
  • CXCR4
  • Endoradiotherapy
  • PET
  • Theranostics
  • [Lu]/[Y]PentixaTher
  • [Ga]PentixaFor

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research


Dive into the research topics of 'Impact of Tumor Burden on Normal Organ Distribution in Patients Imaged with CXCR4-Targeted [68Ga]Ga-PentixaFor PET/CT'. Together they form a unique fingerprint.

Cite this