Clinical Report: Percutaneous Cryoablation for Spinal Metastases – Systematic Review & Meta-analysis

Overview

Percutaneous cryoablation (PCA) is an emerging minimally invasive treatment for spinal metastases that offers precise tumor targeting and effective pain relief. This systematic review and meta-analysis of 11 studies involving 229 patients demonstrates PCA's safety, efficacy in local tumor control, and significant reduction in pain severity scores.

Background

Spinal metastases frequently cause severe pain and disability in cancer patients. Conventional external beam radiotherapy (cEBRT) and stereotactic body radiation therapy (SBRT) are standard treatments but have limitations including toxicity and risk of vertebral fractures. Minimally invasive ablation techniques, such as PCA, have been developed to overcome these challenges. PCA induces tumor destruction through cycles of freezing and thawing, allowing real-time imaging guidance and sparing adjacent vital structures while providing rapid pain relief.

Data Highlights

Key Findings

• PCA demonstrated effective local tumor control in spinal metastases across multiple retrospective and prospective studies.
• Significant reduction in patient-reported pain severity scores was observed post-PCA, indicating rapid and sustained analgesic effects.
• Real-time imaging guidance (CT/MRI) during PCA allows precise ablation with preservation of adjacent critical structures.
• PCA can be performed as an outpatient procedure without general anesthesia, enhancing patient tolerability.
• Complication rates were low, with minimal reports of vascular or neural injury compared to other ablation techniques.
• Most patients had prior radiation therapy, suggesting PCA is effective as a salvage or adjunctive treatment modality.

Clinical Implications

Percutaneous cryoablation offers a minimally invasive, safe, and effective option for managing spinal metastases, particularly in patients with prior radiation or those unsuitable for surgery. Its ability to provide rapid pain relief and local tumor control supports its integration into multidisciplinary cancer care. Real-time imaging guidance enhances procedural safety, making PCA a valuable tool in palliative and adjunctive treatment strategies.

Conclusion

This systematic review and meta-analysis support PCA as a promising treatment for spinal metastatic lesions, combining effective tumor control with significant pain reduction and a favorable safety profile. Further prospective studies are warranted to optimize patient selection and treatment protocols.

References

1. PRISMA 2020 Update -- Preferred Reporting Items for Systematic Reviews and Meta-Analyses
2. Joanna Briggs Institute -- Case Series Checklist
3. Hozo et al. -- Method for Calculating Means and Standard Deviations