How is cancer metastasis treated?

Cancer metastasis treatment options include surgery, radiation therapy, chemotherapy, targeted therapy, and immunotherapy. Patients are advised to seek prompt medical evaluation at a hospital and undergo symptom-specific treatment under the guidance of a physician. The following outlines each approach:

1. Surgical Treatment

Surgery may be considered for patients with a limited number of localized metastatic lesions. It enables direct removal of visible tumor tissue, thereby reducing tumor burden. However, surgery carries inherent risks; therefore, careful assessment of the patient’s overall health status and the resectability of the metastatic lesions is essential. Adjuvant therapies (e.g., chemotherapy or radiation) may also be required postoperatively to prevent recurrence.

2. Radiation Therapy

Radiation therapy employs high-energy radiation to destroy cancer cells. For metastatic lesions that are not amenable to surgical resection—such as painful bone metastases—radiation therapy can effectively alleviate pain and control tumor growth by damaging the DNA structure of cancer cells, thereby inhibiting their ability to proliferate.

3. Chemotherapy

Chemotherapy uses cytotoxic drugs to kill cancer cells. These agents circulate systemically via the bloodstream, reaching metastatic sites throughout the body. For example, in cases of lung cancer with brain metastases, certain chemotherapeutic agents can cross the blood–brain barrier to exert antitumor effects within the central nervous system. While chemotherapy suppresses cancer cell division and proliferation, it may also affect rapidly dividing normal cells, leading to side effects such as nausea, vomiting, and hair loss. The oncologist selects an appropriate chemotherapy regimen based on the specific cancer type and the patient’s overall health status.

4. Targeted Therapy

Targeted therapy specifically inhibits molecular targets uniquely expressed or dysregulated in cancer cells. When specific genetic mutations or abnormal protein expression (e.g., HER2 overexpression) are identified, corresponding targeted agents can be employed. For instance, trastuzumab—a monoclonal antibody targeting HER2—is highly effective in patients with HER2-positive metastatic breast cancer. This approach offers superior efficacy and generally fewer adverse effects compared with conventional chemotherapy, although acquired resistance may develop over time.

5. Immunotherapy

Immunotherapy is widely applicable in the management of metastatic cancer and has been shown to extend survival in many patients. It works by enhancing the body’s intrinsic immune response against cancer. By boosting immune surveillance and effector functions, immunotherapy enables the host immune system to better recognize and eliminate tumor cells, thereby alleviating symptoms and improving clinical outcomes.

Patients should maintain a positive mindset and actively engage in disease management. Adequate rest and avoidance of excessive physical strain are recommended. A nutritionally balanced, easily digestible diet helps strengthen the body’s resistance. Regular follow-up examinations are essential to monitor changes in existing metastases and detect new metastatic lesions early, allowing timely adjustment of treatment strategies per the physician’s recommendations.