Brachytherapy is an effective, patient-centric alternative for cancer patients.

With higher energy and a shorter half-life than competitors, Cesium-131 is proven to be a highly customized and effective treatment for the rapid recovery of patients in the fight against prostate cancer.

Why brachytherapy?

Not all brachytherapy radioisotopes are the same. Cesium-131 offers you a powerful option for treating prostate and other cancers throughout the body.

cesium-131 Seeds

Comparing Treatment Times for Prostate Patients


Out-patient treatment, single visit, rapid return to activity.

Shorter Half-Life

Radical Prostatectomy

1-2 day hospital stay, 2-4 week return to activity.

Higher Energy

External Radiation (IMRT)

40-45 treatment sessions over 8-9 weeks.

What are the advantages and disadvantages?

One treatment is not necessarily the best treatment for everyone. 
Ask your physician about the benefits of seed brachytherapy and if it is an option to treat your cancer.


  • Used to treat tumors of the brain, head and neck, gynecologic, prostate, lungs and other solid mass tumors.
  • Places the radiation directly where it will do the most good, and limits dose to surrounding tissues.
  • Minimally invasive, with no surgical incision and thus has shorter recovery times than other invasive treatments. (1)
  • Is one of the most cost effective treatment options available.
  • Has good local control rates for several types of cancers.
  • Customized to deliver the treatment dose your physician determines is the best to treat your cancer.
  • Allows for additional treatment options, including surgery, radiation, cryosurgery, hormonal therapies, and others.
  • When placed at the time of the surgical procedure, does not require repeat visits for treatment, as with typical radiation procedures.


  • Generally performed under general anesthetic, which may have side effects.
  • May require limited prolonged contact with others immediately after treatment, to limit dose to healthy individuals.
  • Like many prostate cancer treatments, low dose rate brachytherapy (LDR) may have side effects, including urinary and rectal complications and impact on sexual function.
  • Provides a very targeted treatment, if your disease is not in the treatment zone, your cancer may not be treated.

Brachytherapy vs. Other Cancer Treatments

One treatment is not necessarily the best treatment for everyone. 
Ask your physician about the benefits of seed brachytherapy and if it is an option to treat your cancer.

Brachytherapy is highly effective as well as cost-effective.

Many factors contribute to a treatment’s overall “effectiveness”. In addition to being shown to be highly effective in treating different forms of cancer, brachytherapy is a fraction of the total cost to the healthcare system when compared to other popular treatments.

Re-purposed from the International Consortium for Health Outcomes Measurement; MD Anderson Cancer Center via See original article here.

Find a Doctor Near You

A diagnosis is just the first step toward treating your cancer. We are here to help you make an informed treatment decision with your doctor so you can begin living your life again.  Use the search (below) to find a Doctor that specializes in Brachytherapy.

History of Brachytherapy & Cesium-131

The introduction of Cesium-131 represents the culmination of decades of work and millions of dollars of investment. Top medical centers, hospitals and clinics across the United States are now offering this breakthrough treatment for cancer patients.

The word brachytherapy derives from the Greek prefix brachy, meaning “short” or “close,” because the titanium capsules containing the radioisotope are implanted directly into the cancerous prostate gland.

Treatment of cancer using low dose radiation or “seed” brachytherapy was pioneered in the 1960’s as an effective alternative to radical prostatectomy. Pioneers in brachytherapy research initially theorized about the use of Cesium-131 in a titanium capsule, however scientific and economic limitations at the time prevented its development and Iodine-125 emerged as an alternative.

Beginning in 1967, Iodine-125 became the first radioisotope manufactured in a titanium capsule, or seed. While its use continues to this day, many patients and doctors in recent years have chosen Palladium-103, a faster-acting, shorter half-life isotope than Iodine-125. In order to obtain the clinical benefits of Palladium’s short half-life, patients and clinicians were forced to settle for lower energy or tissue penetrating power.

A team of scientists continued to believe the physical characteristics of Cesium-131* could potentially provide superior clinical benefits for seed brachytherapy patients. The team developed the patented process for economically separating and purifying Cesium-131 and in 1998 Isoray was founded to manufacture and commercialize Cesium-131 brachytherapy seeds to treat cancers.

Cesium-131 proposed as an isotope for cancer treatment

Cesium-131 seed design is patented

Isoray Medical (Now Perspective Therapeutics) founded to explore the medical use of Cesium-131

Cesium-131 was cleared by FDA for treatment of cancer

The first patient was implanted with IsoRay Cs-131 seeds

Cesium-131 used for the treatment of a Head & Neck cancer

Cesium-131 used for the treatment of Lung cancer

Cesium-131 used for the treatment of a gynecological cancer

Cesium-131 used for the treatment of a brain tumor

Five year data with Cesium-131 is published establishing the treatment as a viable alternate for prostate cancer treatment

Want to know more about the versatility of Cesium-131


1. Patrick C. Walsh, M.D., Theodore L. DeWeese, M.D., and Mario A. Eisenberger, M.D. Localized Prostate CancerN Engl J Med 2007;357:2696-705.

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