Patterns of Extrapulmonary Metastases in Sarcoma Surveillance

Area of Science:

• Oncology
• Medical Imaging
• Surgical Oncology

Background:

• Soft tissue sarcomas (STS) frequently metastasize, primarily to the lungs.
• Current surveillance often includes abdominal and pelvic imaging, but evidence is limited.
• Optimal surveillance strategies for detecting extrapulmonary metastases remain unclear.

Purpose of the Study:

• To determine the proportion and timing of initial pulmonary versus extrapulmonary metastases in STS.
• To identify factors predicting the development of extrapulmonary metastases.
• To evaluate the utility of abdominopelvic surveillance in STS management.

Main Methods:

• Retrospective review of 382 patients treated surgically for STS.
• Analysis of metastasis patterns (pulmonary vs. extrapulmonary) and time to development.
• Multivariate analysis to identify predictive factors for extrapulmonary metastases.

Main Results:

• 33% of patients developed metastases; 72% were pulmonary, 22% extrapulmonary.
• Extrapulmonary metastases occurred significantly later (median 22 months) than pulmonary (median 11 months).
• High grade and larger tumor size predicted pulmonary metastases, but no factors predicted extrapulmonary ones.

Conclusions:

• A significant proportion of initial STS metastases are extrapulmonary and appear later than pulmonary metastases.
• Predicting extrapulmonary metastases is challenging, complicating targeted surveillance.
• Current surveillance guidelines may need revision to better account for extrapulmonary spread.