期刊
BIOMEDICINES
卷 10, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/biomedicines10071610
关键词
peritoneal carcinomatosis; imaging modality; orthotopic animal model; peritoneal cancer index
资金
- Dutch Cancer Society, UVA [10595]
- Maurits and Anna de Kock stichting
Ultrasound is a reliable non-invasive method to detect and quantify the growth of intraperitoneal tumor nodules in a rat model.
Background: The peritoneum is a common site for the formation of metastases originating from several gastrointestinal and gynecological malignancies. A representative preclinical model to thoroughly explore the pathophysiological mechanisms and to study new treatment strategies is important. A major challenge for such models is defining and quantifying the (total) tumor burden in the peritoneal cavity prior to treatment, since it is preferable to use non-invasive methods. We evaluated ultrasound as a simple and easy-to-handle imaging method for this purpose. Methods: Peritoneal metastases were established in six WAG/Rij rats through i.p. injections of the colon carcinoma cell line CC-531. Using ultrasound, the location, number and size of intraperitoneal tumor nodules were determined by two independent observers. Tumor outgrowth was followed using ultrasound until the peritoneal cancer index (PCI) was >= 8. Interobserver variability and ex vivo correlation were assessed. Results: Visible peritoneal tumor nodules were formed in six WAG/Rij rats within 2-4 weeks after cell injection. In most animals, tumor nodules reached a size of 4-6 mm within 3-4 weeks, with total PCI scores ranging from 10-20. The predicted PCI scores using ultrasound ranged from 11-19 and from 8-18, for observer 1 and 2, respectively, which was quite similar to the ex vivo scores. Conclusions: Ultrasound is a reliable non-invasive method to detect intraperitoneal tumor nodules and quantify tumor outgrowth in a rat model.
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