Cryoablation and Radiofrequency Ablation in Turkey: An Overview

An Introduction to Tumor Ablation

Tumor ablation is a category of minimally invasive cancer treatments that uses focused energy to destroy tumor cells directly at their location within the body. Instead of surgically removing a tumor, ablation techniques eliminate it “in situ” (in place). This is achieved by delivering either extreme heat or extreme cold through a thin, needle-like probe that is guided precisely into the center of the tumor.

Two of the most well-established and widely used ablation techniques are Radiofrequency Ablation (RFA), which uses heat, and Cryoablation, which uses intense cold. These image-guided procedures are considered a cornerstone of interventional oncology. In advanced Turkish medical centers, these therapies offer a valuable treatment option for patients with certain types of cancer, particularly those who may not be candidates for traditional surgery.

The Role of the Interventional Radiologist

Ablation procedures are not performed by surgeons in a traditional operating room. They are performed by highly specialized physicians known as Interventional Radiologists. An interventional radiologist is a doctor who is an expert in both reading medical images (like CT, MRI, and ultrasound scans) and performing minimally invasive procedures using those images as a guide.

Using real-time imaging, the interventional radiologist can navigate needles, catheters, and probes through the body via tiny incisions, often just a few millimeters in length. This allows them to deliver treatment directly to a specific target deep inside the body with remarkable precision, avoiding the need for large surgical incisions.

Radiofrequency Ablation (RFA): Destroying Tumors with Heat

Radiofrequency ablation is a thermal (heat-based) ablation technique. It works by passing a high-frequency electrical current through a probe placed inside the tumor.

• The Procedure: The interventional radiologist guides one or more needle-like RFA probes into the tumor. Once the probes are in position, a generator sends an electrical current to the metal tines at the tip of the probe. This current agitates the ions in the surrounding tissue, which generates intense frictional heat.
• The Mechanism: The heat raises the temperature of the tumor tissue to over 60 degrees Celsius (140 degrees Fahrenheit). This high temperature effectively “cooks” the tissue, causing the tumor cells to die in a process called coagulative necrosis. The ablated, dead tissue is not removed but gradually shrinks over time and is replaced by scar tissue.

RFA is a well-established technique that has been used for many years and is highly effective for treating small, well-defined tumors.

Cryoablation: Destroying Tumors with Cold

Cryoablation, also known as cryosurgery or cryotherapy, works on the opposite principle: it uses extreme cold to freeze and destroy cancer cells.

• The Procedure: The interventional radiologist guides several thin probes, called cryoprobes, into and around the tumor. Pressurized argon gas is then circulated through these probes, causing their tips to become intensely cold—often below -100 degrees Celsius (-148 degrees Fahrenheit).
• The Mechanism: This extreme cold creates a well-defined “ice ball” that completely engulfs the tumor. Cell death is caused by a dual mechanism: first, the formation of ice crystals inside the cancer cells ruptures their membranes. Second, during the subsequent thawing process, further cellular damage occurs. The freeze-thaw cycle is typically repeated two or three times to ensure complete destruction of the targeted tissue. Like with RFA, the dead tumor tissue is left in place to be broken down and absorbed by the body over time. A key advantage of cryoablation is that the ice ball can be clearly visualized on imaging scans, allowing the physician to ensure the entire tumor is covered while avoiding damage to adjacent structures.

Common Applications for Ablation Therapies

Ablation is most effective for treating localized tumors and is a primary treatment option for several types of cancer, especially when surgery is not a viable option.

• Liver Tumors: Ablation is widely used to treat primary liver cancer (hepatocellular carcinoma, HCC) and cancer that has spread to the liver from other organs (liver metastases), such as from colorectal cancer. It is an excellent option for patients with small tumors who may not be candidates for surgical resection due to poor liver function from underlying cirrhosis.
• Kidney Tumors: For small renal (kidney) tumors, particularly in older patients or those with poor kidney function, ablation is a standard alternative to surgery. It is highly effective at destroying small tumors while preserving the maximum amount of healthy, functioning kidney tissue. Both RFA and cryoablation are used.
• Lung Tumors: For patients with early-stage non-small cell lung cancer or a limited number of lung metastases who are not medically fit for surgery, thermal ablation can be used to destroy the tumors.
• Bone Tumors: For patients with painful metastatic tumors in the bones, ablation can be a very effective palliative treatment. By destroying the tumor tissue, it can provide significant and rapid pain relief.
• Soft Tissue Tumors: Certain soft tissue sarcomas and other tumors can also be treated with ablation.

The Patient Experience: What to Expect

The ablation procedure is typically performed in an interventional radiology suite, which is equipped with advanced imaging machines.

1. Preparation: Patients are instructed not to eat for several hours before the procedure. An intravenous (IV) line is placed to administer fluids and medications.
2. Anesthesia: The procedure is performed under either conscious sedation (where the patient is sleepy but can be aroused) or general anesthesia. This ensures the patient is comfortable and remains still during the procedure.
3. The Procedure: The patient lies on an imaging table (usually a CT scanner or an ultrasound bed). The interventional radiologist uses the real-time images to carefully guide the ablation probe(s) through the skin into the tumor. Once the probes are in the correct position, the ablation cycle (either heating or freezing) is initiated. The entire procedure can take one to three hours, depending on the size and number of tumors being treated.
4. Recovery: After the procedure, the probes are removed, and a small bandage is placed over the incision site. The patient is monitored in a recovery area for a few hours. Many patients are able to go home the same day, while some may require a short overnight hospital stay for observation. Post-procedure pain is usually mild and can be controlled with oral medication. Most patients can return to their normal, non-strenuous activities within a few days.

Follow-up imaging scans are performed several weeks or months after the procedure to confirm that the entire tumor has been successfully destroyed.

Frequently Asked Questions

1. Is tumor ablation considered a type of surgery?
No, it is considered a minimally invasive, image-guided procedure, not a traditional surgery. It does not involve large incisions or the surgical removal of tissue. The procedure is performed through needle-sized entry points in the skin, which is why it is often referred to as “percutaneous ablation.”

2. Is the ablation procedure painful?
No, the procedure itself is not painful because it is performed while the patient is under sedation or general anesthesia. After the procedure, some patients may experience mild pain or discomfort at the treatment site for a few days, but this is typically well-controlled with over-the-counter or prescribed pain medication.

3. When is ablation used instead of surgery to treat a tumor?
Ablation is often an excellent alternative to surgery for patients who are not ideal surgical candidates. This could be due to advanced age, other significant health problems (like heart or lung disease), or poor organ function (like cirrhosis of the liver) that would make surgery too risky. It is also used for small tumors where the goal is to destroy the cancer while preserving as much of the surrounding healthy organ as possible.

4. Is the tumor removed from the body during ablation?
No. Unlike surgery, where the tumor is physically cut out and removed, ablation destroys the tumor tissue “in situ” (in place). The high heat or extreme cold kills the cancer cells, which then gradually shrink and are broken down and reabsorbed by the body over time, eventually forming a small scar.

5. How long does it take to recover from an ablation procedure?
Recovery is typically much faster than after traditional open surgery. Most patients can resume their normal, light activities within a few days. Strenuous activity should be avoided for about a week. This is a significant advantage over the several weeks of recovery often required after a major surgical operation.

6. Who performs ablation procedures in Turkish hospitals?
These specialized procedures are performed by Interventional Radiologists. These are physicians who have extensive training in radiology (medical imaging) and in performing minimally invasive, targeted treatments using that imaging for guidance.

7. Can ablation be repeated if a tumor comes back?
Yes. One of the advantages of ablation is that, because it is minimally invasive and spares surrounding tissue, it can often be repeated if the initial tumor recurs in the same location or if a new tumor appears nearby.