01-04-2017 | Interventional
Prospective 1-year follow-up pilot study of CT-guided microwave ablation in the treatment of bone and soft-tissue malignant tumours
Published in: European Radiology | Issue 4/2017
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Purpose
The aims of this work were to assess the feasibility, efficacy, short-term outcome and safety of microwave ablation (MWA) in the treatment of malignant musculoskeletal tumours.
Materials and methods
Sixteen bone and soft-tissue malignant tumours were prospectively included and were treated by CT-guided MWA. The percentage and size of necrosis of the lesions were measured by contrast-enhanced MRI before the procedure and after 1, 3, 6 and 12 months. mRECIST criteria were used to assess tumour response. Procedural success was defined as ≥80 % necrosis. Patient pain (as assessed using a numeric visual scale (NVS)) and side effects were noted.
Results
Six osteolytic metastases, five osteoblastic metastases and five soft tissue sarcomas were treated. At 1 month, 40 % were treated completely, the percentage of necrosis was 85 ± 30.4 %, and the success rate was 80 %. At 3, 6 and 12 months the success rate was 80 %, 76.9 % and 63.6 %, respectively. At 12 months, four lesions (36.3 %) still had no recurrence. Mean NVS during the procedure was 3.5 ± 2.8. One patient had transitory sciatica without neurological deficit that was treated medically.
Conclusion
CT-guided MWA of bone and soft-tissue malignant tumours is efficient, well tolerated and has good short-term anti-cancer effects.
Key Points
• CT-guided MWA is efficient in treating musculoskeletal malignant tumours.
• This prospective pilot study showed MWA induces high percentages of tumour necrosis.
• MWA has good short-term anti-cancer effects.
• MWA has healing potential when lesions can be completely necrosed.
• CT-guided MWA under equimolar mixture of oxygen-nitrous oxide inhalation is well tolerated.