In the battle against cancer, surgical resection used to be the gold standard, but not all patients are suitable for surgery. For patients who cannot undergo surgery due to old age, poor heart and lung function, multiple metastases, or a special location of the tumor (such as being adjacent to major blood vessels), radiofrequency ablation (RFA) offers a less invasive, faster recovery, and repeatable alternative. All of this is made possible by the core weapon - the radiofrequency needle.

Liver Cancer: The Most Classic Indication

Hepatocellular carcinoma is one of the most common malignant tumors worldwide. For early-stage liver cancer (especially single lesions with a diameter of ≤ 5 cm or multiple lesions with no more than 3 and the largest one being ≤ 3 cm), radiofrequency ablation has been recognized as a radical treatment equivalent to surgical resection. Under ultrasound or CT guidance, the doctor will precisely insert the radiofrequency needle into the center of the tumor. A typical ablation treatment can be performed under local anesthesia and takes only 10-30 minutes. The patient can get out of bed and move around the day after the operation, and the hospital stay is only 1-3 days, which is much shorter than traditional open surgery. Studies have shown that for early-stage liver cancer meeting the Milan criteria, the 5-year survival rate after radiofrequency ablation can reach 40%-70%.

Lung Cancer: Overcoming the "Inoperable" Challenge

For early-stage non-small cell lung cancer, especially those with poor lung function or peripheral lung cancers located deep within the lung parenchyma, radiofrequency ablation also demonstrates significant value. Due to the presence of air in the lungs, which results in poor thermal conductivity, the design and operation skills of the radiofrequency needle are particularly important. Doctors need to use multiple needle combinations or extend the ablation time to ensure that the ablation range completely covers the tumor. Compared to stereotactic radiotherapy, the advantage of radiofrequency ablation lies in its ability to complete the treatment in one session, without the need for multiple hospital visits, and causes less radiation damage to the surrounding normal lung tissue.

Kidney Cancer and Bone Tumors: Preserving Organs and Relieving Pain

In the treatment of renal cancer, radiofrequency ablation has become one of the mainstream approaches for treating T1a stage (diameter ≤ 4 cm) renal cancer. It can precisely eliminate the tumor while minimizing the damage to normal renal units, which is of great significance for patients with poor renal function. For bone metastases, radiofrequency ablation not only kills tumor cells but also stabilizes bone through thermal effects and destroys the pain-sensing nerve endings around the tumor. Many patients with advanced cancer who underwent radiofrequency ablation for bone tumors experienced significant relief of severe bone pain and a substantial improvement in their quality of life.

Challenges and Future Prospects

Although the effect is remarkable, radiofrequency ablation also has limitations. For instance, for tumors with a diameter greater than 5 cm, a single ablation is difficult to ensure complete coverage and multiple overlapping ablations are often necessary, increasing the risk of recurrence. Additionally, for tumors located closely to the intestine, bile duct, or major blood vessels, there is a higher risk of perforation or thermal damage during ablation.

To overcome these challenges, new technologies are emerging. For instance, multi-pole radiofrequency needles can deploy multiple electrodes through a single puncture, creating a large ablation zone. The integration of navigation technology combines preoperative MRI/CT images with real-time intraoperative ultrasound, enabling doctors to precisely locate hidden lesions as if they were viewing a map. In the future, radiofrequency needles may also be equipped with drug release or immune adjuvant functions, achieving a "1 + 1 > 2" effect by physically ablating while stimulating a systemic anti-tumor immune response.

It can be said that the radiofrequency needle is not only a "hot knife" for tumor treatment, but also a perfect embodiment of the modern concept of precision medicine.