Abstract
Purpose
We demonstrated earlier in mouse models of pancreatic ductal adenocarcinoma (PDA) that Ktrans derived from dynamic contrast-enhanced (DCE) MRI detected microvascular effect induced by PEGPH20, a hyaluronidase which removes stromal hyaluronan, leading to reduced interstitial fluid pressure in the tumor (Clinical Cancer Res (2019) 25: 2314–2322). How the choice of pharmacokinetic (PK) model and arterial input function (AIF) may impact DCE-derived markers for detecting such an effect is not known.
Procedures
Retrospective analyses of the DCE-MRI of the orthotopic PDA model are performed to examine the impact of individual versus group AIF combined with Tofts model (TM), extended-Tofts model (ETM), or shutter-speed model (SSM) on the ability to detect the microvascular changes induced by PEGPH20 treatment.
Results
Individual AIF exhibit a marked difference in peak gadolinium concentration. However, across all three PK models, kep values show a significant correlation between individual versus group-AIF (p < 0.01). Regardless individual or group AIF, when kep is obtained from fitting the DCE-MRI data using the SSM, kep shows a significant increase after PEGPH20 treatment (p < 0.05 compared to the baseline); %change of kep from baseline to post-treatment is also significantly different between PEGPH20 versus vehicle group (p < 0.05). In comparison, when kep is derived from the TM, only the use of individual AIF leads to a significant increase of kep after PEGPH20 treatment, whereas the %change of kep is not different between PEGPH20 versus vehicle group. Group AIF but not individual AIF allows detection of a significant increase of Vp (derived from the ETM) in PEGPH20 versus vehicle group (p < 0.05). Increase of Vp is consistent with a large increase of mean capillary lumen area estimated from immunostaining.
Conclusion
Our results suggest that kep derived from SSM and Vp from ETM, both using group AIF, are optimal for the detection of microvascular changes induced by stroma-directed drug PEGPH20. These analyses provide insights in the choice of PK model and AIF for optimal DCE protocol design in mouse pancreatic cancer models.





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Acknowledgements
The authors thank the support from the Small Animal Imaging Facility (SAIF) of the Department of Radiology at the University of Pennsylvania.
Data Availability Statement
Image data will be shared at a data repository built for Penn Quantitative Imaging Resource for Pancreatic Cancer (https://pennpancreaticcancerimagingresource. github.io/data.html/).
Funding
This project is supported by NIH U24CA231858 (Penn Quantitative Imaging Resource for Pancreatic Cancer) and P30-CA-016520-42(Abramson Cancer Center).
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Conceptualization, RZ, J.C.; methodology development, J.C., S.P., and R.Z.; software, S.P.; data analysis, J.C., S.P., and R.Z.; data curation, J.C., S.P.; writing—original draft preparation RZ and J.C; writing review and editing, RZ, JC, MR, and S.P.; visualization, J.C., S.P., supervision, R.Z.; funding acquisition, R.Z. and MR. All authors have read and agreed to the published version of the manuscript.
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The animal study protocol was approved by the Animal Care and Use Committee of the University of Pennsylvania (Protocol # 806083 approved on 03/12/2017).
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Not applicable (no human study involved).
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Cao, J., Pickup, S., Rosen, M. et al. Impact of Arterial Input Function and Pharmacokinetic Models on DCE-MRI Biomarkers for Detection of Vascular Effect Induced by Stroma-Directed Drug in an Orthotopic Mouse Model of Pancreatic Cancer. Mol Imaging Biol 25, 638–647 (2023). https://doi.org/10.1007/s11307-023-01824-7
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DOI: https://doi.org/10.1007/s11307-023-01824-7