{"id":5616,"date":"2023-09-04T03:12:50","date_gmt":"2023-09-04T03:12:50","guid":{"rendered":"https:\/\/cm.vastapps.dev\/tcia-collection\/pdmr-425362-245-t\/"},"modified":"2023-09-13T11:59:58","modified_gmt":"2023-09-13T11:59:58","slug":"pdmr-425362-245-t","status":"publish","type":"tcia_collection","link":"https:\/\/cm.vastapps.dev\/tcia-collection\/pdmr-425362-245-t\/","title":{"rendered":"PDMR-425362-245-T"},"featured_media":7899,"template":"","citation-tax":[],"cancer_types":["Melanoma"],"citations":[4508,2925],"collection_doi":"10.7937\/TCIA.2020.7YRS-7J97","collection_download_info":"Click the Versions tab for more info about data releases.","collection_downloads":[5089,5090,5091,5092,5093],"full_export":"

Summary<\/h1>
Pre-clinical animal models of spontaneous metastatic cancer are infrequent; the few that exist are resource intensive because determination of the presence of metastatic disease, metastatic burden, and response to therapy normally require multiple timed cohorts with animal sacrifice and extensive pathological examination. We identified and characterized a patient derived xenograft model with metastatic potential, melanoma xenograft 425362-245-T. In this study we performed a detailed imaging characterization (workflow below) of this model, which develops spontaneous lung metastases, details are provided in the attached standard operating procedures. Tumors in half of the mice were resected in the range 200-300 mm3<\/sup> size; tumors in the other half were allowed to grow until it was necessary to euthanize them because of tumor size.

<\/span><\/p>

The imaging characteristics of\u00a0this model (PDMR-425362-245-T<\/a>) which is available from the National Cancer Institute Patient-Derived Models\u00a0Repository (https:\/\/pdmr.cancer.gov\/<\/a>), is highly favorable for preclinical research studies of\u00a0metastatic disease when used in conjunction with non-contrast T2 weighted MRI.<\/p>

Results: Melanoma (PDMR-425362-245-T)<\/strong><\/h3>

<\/p>

Table 1<\/strong>: Penetrance and location of pathological confirmed metastatic lesion(s).<\/p>

<\/colgroup>

# animals in group<\/strong><\/p><\/td>

# animals that displayed metastasis in MRI and confirmed by Pathology<\/strong><\/p><\/td>

Pathology confirmation of MRI (primary imaging site)<\/strong><\/p><\/td>

Other confirmed Location (s)<\/strong><\/p><\/td>

Mouse ID: MRI with pathology confirmation of metastasis<\/strong><\/p><\/td><\/tr>

<\/p>

10 (non-resected)<\/span><\/p>

<\/p><\/td>

4<\/p>

(6 mice were EU due to xenograft size prior to observation of metastasis)<\/p><\/td>

<\/p>

Lung<\/p><\/td>

<\/p>

Kidney<\/p><\/td>

<\/p>

1512, 1516, 1518, 1520<\/p><\/td><\/tr>

10 (resected)<\/span><\/p><\/td>

10<\/span><\/p><\/td>

Lung<\/p><\/td>

Kidney, Liver, Pancreas<\/p>

<\/p><\/td>

1506, 1508, 1509, 1510, 1511, 1515, 1517, 1519, 1521, 1523<\/p><\/td><\/tr><\/tbody><\/table><\/div><\/div>

<\/p>

Percent penetrance with respect to the average time-to-metastasis for non-resected (plot A: time from implant) and resected (plot B: time from tumor resection) cohorts.<\/p>

<\/p>

<\/colgroup>

<\/span><\/p>

Plot A<\/p><\/div><\/th>

<\/span><\/p>

Plot B<\/p><\/div><\/th><\/tr><\/tbody><\/table><\/div>

<\/p>

PET\/CT Characterization of the primary tumor:\u00a0 Baseline PET (SOP attached) were performed when tumor reached an approximate 200 mm3<\/sup>.\u00a0\u00a0 Average SUVmax values (n=5) were calculated; [18<\/sup>F]FDG: 2.7 \u00b1 0.5 and [18<\/sup>F]FLT: 2.0 \u00b1 0.3.<\/span><\/p>

Conclusion:<\/h3>

Melanoma PDMR-425362-245-T model can be challenging due to the rapid growth of the xenograft and regrowth.\u00a0 Metastases was well observed on T2 MRI imaging allowing non-invasive evaluation in treatment trials.<\/p>

Acknowledgements<\/span><\/h3>

We would like to acknowledge the individuals and institutions that have provided data for this collection:<\/p>