Increases in the Association Between the Rates of Synchronous and Metachronous Metastases over Time.

Area of Science:

• Oncology
• Epidemiology
• Medical Imaging

Background:

• Investigates the evolving association between synchronous and metachronous metastases across diverse cancer types.
• Examines temporal trends in metastasis patterns using a large-scale population database.

Purpose of the Study:

• To quantify the relationship between synchronous and metachronous metastasis rates over several decades.
• To determine if the association between these metastasis types has changed over time.

Main Methods:

• Retrospective analysis of the Surveillance, Epidemiology, and End Results (SEER)-8 dataset (1975-2020).
• Calculation of crude metastasis rates for 18 solid tumor types.
• Linear regression and Fisher's z-transformation to assess temporal changes in association.

Main Results:

• A significant association between synchronous and metachronous metastases was observed across all time points.
• The strength of this association demonstrated a consistent increase from 1975 to 2015.
• Correlation coefficients (R) increased from 0.59 in 1975 to 0.87 in 2015.

Conclusions:

• An increasing association between synchronous and metachronous distant metastases is evident over time.
• This trend coincides with the increased utilization of advanced imaging techniques like FDG-PET.
• Future research with novel PET radiotracers could prospectively evaluate the role of imaging in metastasis assessment.