In modern surgical oncology, the choice between surgical excision of a tumor and its thermal destruction is a key issue. Under what conditions does local destruction become a full-fledged alternative? Optimal minimally invasive tumor treatment or open surgery is selected based on the size and localization of the focus, volumetric and functional reserve of the parenchyma, and the patient's somatic state.
Cool-tip Radiofrequency Ablation and Open Resection: What is the difference
Speaking about the choice of treatment tactics, Dmytro Savenkov, Medical Director of the Dnipro Oncology Dispensary and surgical oncologist of the highest category, notes that the fundamental difference between the methods lies in the mechanism of action on the pathological focus:
- Open liver resection: Surgical removal of the tumor with healthy tissue to ensure a cleaner R0 margin ≥1 mm.
- Thermal radiofrequency ablation (RFA) of tumors: Intratissue heating (50–100°C), causing coagulation necrosis.
Modern Cool-tip radiofrequency ablation uses an internally cooled electrode. The circulation of the solution prevents charring of tissues around the needle, reduces resistance, and forms a larger zone of destruction in a single cycle.
Access features and technical specifications:
- Minimally invasive nature is primarily inherent in percutaneous RFA under US/CT guidance.
- Technical description of the system is highlighted in the material: Cool-tip Ablator.
Indications for Radiofrequency Ablation: When minimally invasive tumor treatment is considered
Considering the possibilities of preserving healthy organ parenchyma and minimizing surgical risks, specialists emphasize strict selection criteria for minimally invasive treatment. As noted in the practical review of the radiofrequency ablation technique, RFA is considered an effective alternative when clear indications are present:
Small foci and the ability to provide an ablation margin
- Size of foci: RFA is most effective for solitary or several (up to 3) tumors ≤3 cm.
- Ablation margin: Ability to form a destruction margin A0 ≥5 mm in healthy tissues.
- Anatomy: Safe needle insertion tract under US/CT guidance.
High surgical risk and the need to preserve organ tissue
- Concomitant pathologies: Somatic status ASA ≥3, high surgical risk.
- Functional reserve: Limited remnant parenchyma (FLR <30%) or cirrhosis (Child-Pugh A/B).
- Example: Early hepatocellular carcinoma (≤3 cm) in non-candidates for surgery.
When resection has advantages over radiofrequency ablation
- Anatomic limitations: Location of the tumor near major blood vessels (<5 mm) due to the heat-sink effect.
- Size and localization: Foci >3–5 cm or subcapsular location.
- Histological control: Need for accurate assessment of the R0 margin and vascular invasion.
When radiofrequency ablation or resection is inappropriate, the oncology board evaluates alternative methods (MWA, SBRT, systemic therapy).
Radiofrequency Ablation or Resection: Comparison by key criteria
| Criterion | Percutaneous Cool-tip RFA | Open Resection |
|---|---|---|
| Access | Percutaneous | Laparotomy with organ mobilization |
| Tissue preservation | Parenchyma organ-preservation | Removal with margin or within an anatomical unit |
| Histology | Coagulation necrosis in situ | Full material for examination |
| Complications | Low rate (Grade 3–5: 1.5–5%) | Higher rate (Grade 3–5: 13–20%) |
| Recovery | Hospitalization 1–3 days, rapid rehabilitation | Hospitalization 7–12 days, prolonged period |
| Repeatability | High upon appearance of new foci | Impaired repeatability due to adhesions |
Efficacy of Radiofrequency Ablation: What determines the result
Tumor size, localization, and completeness of ablation
- Ablation margin: A margin A0 ≥5 mm provides local control in 95% of cases (COLLISION trial). With A1 <5 mm, the risk of recurrence increases to 47%.
- Heat sink: Vascular environment lowers the temperature below 50°C.
Local control, recurrence, and survival
- Overall survival (OS): For small foci (≤3 cm), 5-year OS after ablation is 51.2–55.2%, which is comparable to resection (55.1–58.0%).
- Safety profile: Complication rate is 2.5–3 times lower than resection (19% vs 46%).
How the Treatment Method is Selected: Decision of the oncology board
The decision on method selection is made by a multidisciplinary team. It is based on the analysis of a practical list of criteria: histological type, stage, number and location of foci, organ function, concomitant diseases, and treatment goal.
RFA and resection can be both alternatives and components of a combined treatment strategy for primary and metastatic liver formations.