What Is Brachytherapy for Prostate Cancer?

A Targeted, Minimally Invasive Radiation Option

For men diagnosed with localized prostate cancer, brachytherapy is one of the most well-established radiation treatment options available. Unlike external beam radiation, which delivers energy from outside the body, brachytherapy places the radiation source directly inside the prostate gland. This internal approach delivers a highly concentrated, precisely targeted dose of radiation at the site of disease, with substantially reduced exposure to surrounding healthy tissue.

What Is Brachytherapy for Prostate Cancer?

Brachytherapy is a form of internal radiation therapy. The word "brachy" derives from the Greek word for short distance, reflecting the fact that the radiation source is placed in close proximity to the tumor rather than delivered from an external machine.

For prostate cancer, low-dose rate (LDR) brachytherapy involves implanting tiny radioactive seeds, each approximately the size of a sesame seed, directly into the prostate gland. These seeds emit radiation continuously over several weeks, targeting cancer cells while minimizing dose to the bladder, rectum, and surrounding structures.

There are two primary types of prostate brachytherapy:

• Low-Dose-Rate (LDR) Brachytherapy: Radioactive seeds, most commonly containing Palladium-103 or Iodine-125, are permanently implanted in the prostate. The seeds emit a low, continuous dose of radiation over weeks to months. Once the radioactive material is depleted, the seeds remain in place permanently but are no longer active. LDR brachytherapy is completed in a single outpatient procedure and is the most widely used form for localized, low-to-intermediate-risk prostate cancer.
• High-Dose-Rate (HDR) Brachytherapy: A radioactive source is temporarily inserted into the prostate through thin catheters and then removed after each session. HDR brachytherapy is typically reserved for higher-risk prostate cancer or used in combination with external beam radiation therapy (EBRT).

At Atlanta Prostate Center, our board-certified urologists specialize in LDR brachytherapy, offering intraoperative real-time adaptive planning that enables millimeter-level precision in seed placement customized to each patient's anatomy.

Who Is a Candidate for Brachytherapy?

LDR brachytherapy is most appropriate for men with low-to-intermediate-risk, localized prostate cancer, meaning the cancer has not spread beyond the prostate gland. Candidate evaluation includes a thorough review of:

• PSA levels and PSA density
• Gleason score and grade group from biopsy pathology
• Prostate cancer volume and anatomy on imaging
• Urinary function and symptom score
• Overall health status and medical history

Brachytherapy may not be recommended for men with significantly enlarged prostates, severe pre-existing urinary obstruction, or higher-risk disease features that require a combined treatment approach. A consultation with a urologist is essential to determine whether brachytherapy is the right fit for an individual's diagnosis and goals.

What to Expect in Brachytherapy for Prostate Cancer

One of the distinguishing advantages of LDR brachytherapy is its streamlined, outpatient process. Here is what patients can expect from consultation through recovery.

Consultation and Evaluation

Before any procedure, the treating physician reviews all diagnostic information, including PSA levels, biopsy pathology, MRI imaging, and overall health history. If brachytherapy is appropriate, a volume study using transrectal ultrasound (TRUS) is performed to map the prostate's exact dimensions. This imaging data forms the foundation of the treatment plan.

Treatment Planning

Using the ultrasound data, the care team develops a customized seed implantation plan specifying the number, type, and precise placement of each radioactive seed. This planning step is critical to ensuring accurate, effective radiation delivery while protecting adjacent structures such as the urethra, bladder neck, and rectum.

The Procedure

On the day of treatment, the patient receives anesthesia. The physician uses real-time ultrasound guidance to insert thin needles through the perineum and place the radioactive seeds directly into the prostate tissue. The entire procedure typically takes between 30 and 60 minutes, and most patients are discharged the same day.

Recovery

Recovery from LDR brachytherapy is generally brief. Most men are able to return to light daily activities within one to two days. Some temporary urinary symptoms, including increased frequency, urgency, or mild discomfort, are common in the weeks following the procedure and typically resolve over time. During the period of seed activity, patients are advised to follow specific precautions, such as limiting prolonged close contact with pregnant women and young children and using a condom during sexual activity as a short-term precautionary measure.

How Successful Is Brachytherapy for Prostate Cancer?

Brachytherapy has a well-documented record of long-term cancer control in appropriately selected patients. For men with low-risk localized prostate cancer, 10-year and 15-year biochemical disease-free survival rates are comparable to those achieved with radical prostatectomy and external beam radiation therapy.

Several factors contribute to the effectiveness of modern LDR brachytherapy:

• Dose escalation: Brachytherapy allows radiation dose to the prostate to be significantly higher than what is typically achievable with external beam radiation alone, which is associated with improved long-term cancer control rates.
• Real-time adaptive planning: Intraoperative imaging allows the physician to refine seed placement during the procedure itself, optimizing dose distribution based on the patient's actual anatomy in real time.
• Targeted delivery: Because the radiation source is placed inside the prostate, surrounding healthy tissue receives substantially less radiation compared to external beam approaches.

For higher risk disease, brachytherapy is often combined with external beam radiation therapy and, in some cases, androgen deprivation therapy (ADT) to achieve optimal outcomes. The appropriate approach depends on each patient's risk category, Gleason score, and clinical staging.

Potential Side Effects of Brachytherapy

Like all prostate cancer treatments, brachytherapy carries potential side effects. Understanding these helps patients make fully informed decisions about their care.

The most common side effects involve urinary function. Increased frequency, urgency, and a temporarily weakened urinary stream are frequently reported in the first one to six months following the procedure. The majority of men see significant improvement as the seeds' radiation activity diminishes over time. A small percentage of patients may require temporary catheterization for urinary retention in the immediate post-procedure period.

Bowel-related side effects are generally less common with brachytherapy than with external beam radiation, given the localized nature of the treatment. Mild rectal irritation is possible but typically transient. To reduce the risk of radiation effects on the rectum, Atlanta Prostate Center offers and recommends rectal spacing, a minor procedure that uses a biocompatible hyaluronic gel to protect the rectum. It stays in place during the treatment and the body reabsorbs it within 6 to 9 months.

Erectile function may be affected, particularly in older men or those with pre-existing dysfunction. Unlike the more immediate impact seen with robotic prostatectomy, radiation-related erectile dysfunction from brachytherapy tends to develop gradually over time. Seed migration, where seeds occasionally shift from their original placement, is rare and seldom affects treatment outcomes.

Long-term serious complications are uncommon when brachytherapy is performed by an experienced team with precise, individualized treatment planning.

Conclusion

Brachytherapy for prostate cancer is a proven, minimally invasive treatment that delivers targeted radiation therapy directly to the site of disease. For appropriately selected men, it offers long-term cancer control rates comparable to surgery, a brief recovery period, and a manageable side effect profile. Understanding the full range of available options, and how each aligns with your specific diagnosis and quality-of-life goals, is the essential first step in making a confident treatment decision.