The Role of Interventional Procedures in Cancer Treatment

Interventional procedures play a critical and multifaceted role in modern cancer therapy. Once regarded mainly as auxiliary or palliative approaches, they have evolved into core components of treatment strategies for many malignancies. Their key strengths lie in precision, minimal invasiveness, and therapeutic effectiveness.

Interventional procedures typically involve the use of fine instruments-such as puncture needles, catheters, and guidewires-guided by medical imaging technologies including DSA, CT, and ultrasound, to diagnose or treat tumors directly. These procedures are broadly classified into vascular and non-vascular interventions.

Below are the major roles of interventional procedures in cancer management.

1. Diagnosis and Staging

Biopsy: Imaging-guided percutaneous biopsy enables accurate sampling of suspicious lesions. As the gold standard for pathological confirmation, it provides essential information on tumor type and molecular characteristics, forming the basis for individualized treatment planning.

Angiography: Visualizes tumor-feeding arteries and vascular anatomy, offering crucial guidance for subsequent interventional therapies while helping assess tumor extent.

2. Local Treatment (Curative or Downstaging)

Local tumor control represents the core therapeutic value of interventional procedures.

• Transarterial Chemoembolization (TACE) / Drug-Eluting Bead TACE (DEB-TACE)：

​​​​​​​​​​​​​​​​​​​​​    - Principle: A catheter is selectively advanced into the tumor's feeding artery, followed by the delivery of chemotherapy agents or drug-eluting beads and embolic materials. This achieves both high local drug concentration and occlusion of tumor blood supply, producing a synergistic antitumor effect.

    - Application: A standard non-surgical treatment for primary liver cancer, also applied in liver metastases, renal cell carcinoma, uterine fibroids, and other conditions.

• Ablation Therapy:

    - Principle: Under imaging guidance, ablation probes (radiofrequency, microwave, cryoablation, etc.) are inserted directly into the tumor to destroy cancer cells via thermal or cryogenic energy.

    - Application: For early-stage small tumors-such as hepatocellular carcinoma, peripheral lung cancer, and renal tumors-ablation can achieve outcomes comparable to surgical resection. It is also effective for local control in non-surgical candidates with advanced disease.

• Radioactive Seed Implantation:

    - Principle: Radioactive seeds (e.g., iodine-125) are implanted into the tumor according to a three-dimensional treatment plan, delivering continuous low-dose radiation while minimizing exposure to surrounding healthy tissue.

    - Application: Commonly used in prostate cancer, head and neck tumors, pancreatic cancer, and recurrent or residual lesions.

3. Palliative Care and Symptom Management

In advanced cancer, interventional procedures play an important role in symptom relief and quality-of-life improvement.

•  Hemostasis: Emergency arterial embolization can rapidly control life-threatening bleeding caused by tumor rupture or invasion.
• Relief of Obstruction:

    - Biliary obstruction: Percutaneous drainage or stent placement to relieve obstructive jaundice.

    - Gastrointestinal obstruction: Esophageal or intestinal stents to restore luminal patency.

    - Superior vena cava syndrome: Venous stenting to quickly alleviate facial and upper-limb edema.

• Pain Management: Procedures such as embolization or cementoplasty effectively reduce pain from bone metastases while improving structural stability.
• Effusion Drainage: Percutaneous drainage of pleural or peritoneal effusions to relieve compression-related symptoms.

4. Integration with Other Treatment Modalities

Interventional therapy is frequently combined with surgery, radiotherapy, chemotherapy, targeted therapy, and immunotherapy.

• Neoadjuvant (Downstaging) Therapy: Preoperative interventional treatment can reduce tumor burden and clarify tumor margins, converting unresectable tumors into resectable ones.
• Adjuvant Therapy: Postoperative interventions may eliminate residual microscopic disease and reduce recurrence risk.
• Combination with Systemic Therapy: Local interventional control combined with systemic targeted or immunotherapy has become a mainstream strategy for advanced cancers, such as hepatocellular carcinoma (e.g., TACE-based combination regimens).

Advantages and Characteristics

• Minimally invasive: Small puncture access, limited trauma, faster recovery.
• High precision: Real-time imaging guidance minimizes damage to normal tissue.
• Repeatable: Suitable for multiple lesions or recurrent disease.
• Lower systemic burden: Particularly beneficial for elderly or medically fragile patients.

Limitations

• Primarily effective for localized disease, with limited impact on widespread metastases.
• Outcomes depend on operator expertise and imaging quality.
• Certain procedures may cause post-treatment symptoms, such as pain or fever (e.g., post-embolization syndrome).

Interventional procedures are an integral component of modern multidisciplinary cancer care. They contribute across the full spectrum of cancer management-from diagnosis and local curative treatment to downstaging and palliative care-offering patients more precise, flexible, and effective therapeutic options. Optimal treatment strategies should be developed collaboratively by multidisciplinary teams, tailored to each patient's clinical condition.