Stereotactic Body Radiation therapy for Liver Metastases: Systematic Review and Meta-Analysis With International Stereotactic Radiosurgery Society (ISRS) Practice Guidelines

Purpose: Liver metastases are a significant clinical challenge in cancer management, often representing a stage of disease in which curative treatment is still possible. Stereotactic body radiation therapy (SBRT) has emerged as a promising modality for treating these metastases, offering a noninvasive approach with potential for high efficacy. This systematic review and meta-analysis provides a comprehensive analysis of the efficacy and safety of SBRT in treating liver metastases, and practice recommendations are provided. Methods and Materials: We performed a thorough literature review, adhering to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses approach, and included 33 studies with a total of 3101 patients and 4437 liver metastases. Results: The review revealed pooled local control rates at 1, 2, and 3 years of 85%, 75%, and 68% respectively, while overall survival rates were 79%, 54%, and 37%. Grade 3 and 4 side effects occurred in only 3% of patients. The review of the studies highlighted the importance of factors such as primary tumor histology, lesion characteristics, and radiation dose in predicting treatment outcomes. Conclusions: This review supports the growing body of evidence that SBRT is an efficacious and safe treatment option for liver metastases. It underscores the need for careful patient selection and personalized treatment planning to optimize outcomes.