AI Article Synopsis
- - The study explores the continuum of metastatic disease, aiming to quantify the tumor burden and patterns of spread in patients referred for PET scans, revealing a complex relationship between the number of metastases and their organ distribution.
- - Analysis of over 7,000 PET scans showed that 33% of patients had metastatic disease, with about half classified as oligometastatic (max 5 metastases) and half as polymetastatic (over 5 metastases), displaying common primary tumors like lung and breast cancers.
- - Findings indicate that many patients either have a solitary metastasis or a high tumor burden (>10 metastases), but those with multiple metastases often have them concentrated in one or two organs, supporting existing theories of metast
Article Abstract
Introduction And Background: Metastatic disease has been proposed as a continuum, with no clear cut-off between oligometastatic and polymetastatic disease. This study aims to quantify tumor burden and patterns of spread in unselected metastatic cancer patients referred for PET-based staging, response assessment of restaging.
Materials And Methods: All oncological fluorodeoxyglucose (FDG-) and prostate-specific membrane antigen (PSMA-) positron emission tomography (PET) scans conducted at a single academic center in 2020 were analyzed. Imaging reports of all patients with metastatic disease were reviewed and assessed.
Results: For this study, 7,000 PET scans were screened. One third of PET scans (n = 1,754; 33 %) from 1,155 unique patients showed presence of metastatic disease from solid malignancies, of which 601 (52 %) and 554 (48 %) were classified as oligometastatic (maximum 5 metastases) and polymetastatic (>5 metastases), respectively. Lung and pleural cancer, skin cancer, and breast cancer were the most common primary tumor histologies with 132 (23.8 %), 88 (15.9 %), and 72 (13.0 %) cases, respectively. Analysis of the number of distant metastases showed a strong bimodal distribution of the metastatic burden with 26 % of patients having one solitary metastasis and 43 % of patients harboring >10 metastases. Yet, despite 43 % of polymetastatic patients having >10 distant metastases, their pattern of distribution was restricted to one or two organs in about two thirds of patients, and there was no association between the number of distant metastases and the number of involved organs.
Conclusion: The majority of metastatic cancer patients are characterized by either a solitary metastasis or a high tumor burden with >10 metastases, the latter was often associated with affecting a limited number of organs. These findings support both the spectrum theory of metastasis and the seed and soil hypothesis and can support in designing the next generation of clinical trials in the field of oligometastatic disease.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10823052 | PMC |
| http://dx.doi.org/10.1016/j.ctro.2024.100724 | DOI Listing |
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