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Use true circular microwave needle for ultrasound-guided thermal ablation in MSA （microwave spherical ablation） group.

Use normal microwave needle for ultrasound-guided thermal ablation in MTA （microwave ablation） group.

Use true circular microwave needle for thermal ablation

True circular microwave needle

Xiang Jing, MD

Yan Zhou, MD

Xiang Jing

Comparison of the progression-free survival, overall survival, local progression rates, complete ablation rates and the complications rate of MSA and traditional MWA in the treatment of single hepatocellular carcinoma with a diameter of ≤5cm.

HCC is a serious threat to the health of people，Early treatment of HCC results in a good prognosis for patients. Microwave ablation (MWA) is an important method for the treatment of early HCC. The traditional MWA technology has a long diameter of the ablation foci which is much larger than the transverse diameter, so in order to obtain a sufficient transverse diameter, the long diameter is often too large beyond the tumor boundary. That will cause too much normal liver tissue is unnecessarily damaged, especially for patients with severe liver cirrhosis or patients with liver cirrhosis who have undergone liver resection. In addition, it is easy to cause damage to adjacent vital tissues and organs. Changes in tissue properties during ablation affect the stability of the microwave field, resulting in unpredictable ablation shapes, which may cause omissions during tumor ablation, especially in multiple overlapping ablation, resulting in incomplete ablation, or increasing the risk of local tumor progression after treatment. Microwave spherical ablation (MSA) technology is a new MWA technology. With the help of temperature control technology, field control technology and wave control technology, a single needle can produce predictable spherical ablation lesions. Theoretically, MSA can improve the controllability of the ablation foci, which is suitable for the purpose of conformal ablation of large tumors in clinical practice, thereby minimizing the damage of local thermal ablation to liver tissue and adjacent important organs. However, there are few reports on the comparison of the therapeutic effect of MSA and traditional MWA. This study intends to conduct a prospective randomized controlled study based on the two mature microwave treatment methods of MSA and traditional MWA ablation to explore the effectiveness and safety of MSA in clinical application, providing evidence-based medical evidence for the clinical application of MSA.

Study of Microwave Spherical Ablation and Traditional Microwave Ablation in Single Hepatocellular Carcinoma ≤5cm

A Single-center, Prospective Randomized Controlled Study of Microwave Spherical Ablation and Traditional Microwave Ablation in the Treatment of Single Hepatocellular Carcinoma With a Diameter of ≤5cm

Compare the time to tumor progression after therapy of MSA and traditional MWA in the treatment of single hepatocellular carcinoma with a diameter of ≤5 cm

Compare the time to of all-cause mortality after therapy of MSA and traditional MWA in the treatment of single hepatocellular carcinoma with a diameter of ≤5cm

Local progression was defined as new lesions with hyperenhancement in the arterial phase and low enhancement in the portal or delayed phase found adjacent to the ablation lesion (≤5 mm) during follow-up. Compare the local progression rates after therapy of MTA and traditional MWA in the treatment of single hepatocellular carcinoma with a diameter of ≤ 5 cm

Complete ablation was defined as the tumor showing no enhancement in three stages on contrast-enhanced imaging. Compare the rate of complete ablation after therapy of MTA and traditional MWA in the treatment of single hepatocellular carcinoma with a diameter of ≤5 cm

Compare the rate of the complications during and after the therapy of MSA and traditional MWA in the treatment of patients with single hepatocellular carcinoma with a diameter of ≤5cm

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization
Study of Microwave Spherical Ablation and Traditional Microwave Ablation in Single Hepatocellular Carcinoma ≤5cm	NCT05361538	Hepatocellular ... Microwave Ablat... Microwave Spher... Prognosis	True circular m...	18 Years - 75 Years	Tianjin Third Central Hospital
Study of Microwave Spherical Ablation and Traditional Microwave Ablation in Single Hepatocellular Carcinoma ≤5cm	NCT05361538	Hepatocellular ... Microwave Ablat... Microwave Spher... Prognosis	True circular m...	18 Years - 75 Years	Tianjin Third Central Hospital
Study of Microwave Spherical Ablation and Traditional Microwave Ablation in Single Hepatocellular Carcinoma ≤5cm	NCT05361538	Hepatocellular ... Microwave Ablat... Microwave Spher... Prognosis	True circular m...	18 Years - 75 Years	Tianjin Third Central Hospital

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