Is radioactive particle implantation considered as a form of radiotherapy?

Radioactive seed implantation is indeed a form of radiotherapy, specifically a brachytherapy technique. It involves directly implanting radioactive seeds into the tumor or the surrounding tissues, utilizing the continuous radiation released to destroy cancer cells. Compared to traditional external beam radiotherapy, this method can more precisely concentrate radiation on the lesion area while minimizing the impact on surrounding healthy tissues.

Radioactive seed implantation is a minimally invasive radiotherapy technique commonly used to treat localized solid tumors, such as prostate cancer, lung cancer, and cervical cancer. The principle involves doctors using imaging guidance to implant seed carriers, such as iodine-125 or palladium-103, into the tumor. The seeds release low doses of gamma or beta rays over an extended period, directly killing cancer cells and delaying tumor growth. This method is particularly suitable for deep tumors or smaller lesions.

Traditional external beam radiotherapy projects high-energy rays from external devices to the tumor, potentially causing some damage to surrounding tissues. In contrast, radioactive seed implantation precisely targets the tumor for localized radiation with fewer side effects. The treatment is usually completed in a single session, allowing patients to resume their daily activities immediately and reducing the inconvenience of multiple hospital visits.

This method is suitable for some patients with early-stage localized cancer, especially those with clearly defined tumor areas unsuitable for resection or traditional radiotherapy. For example, prostate cancer patients who choose seed implantation can achieve a five-year survival rate of over 80%. However, it is important to note that this therapy is not suitable for patients with large tumors, widespread metastasis, or other severe systemic diseases. Patients should select the best treatment plan after evaluation by a professional physician.

Although this technique is minimally invasive with few side effects, it may cause local pain, infection, swelling, and other issues. The potential impact of radioactive seeds on other organs in the body requires regular follow-up observations. After treatment, patients should avoid long-term close contact with pregnant women and infants to reduce unnecessary radiation exposure. Radioactive seed implantation is one of the important methods in cancer radiotherapy, providing a more precise and safe treatment option for many patients. It is recommended that patients consult with an oncologist to develop a personalized treatment plan based on their condition for optimal efficacy.