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Health & Medicine for Senior Citizens

Latest Prostatectomy Radiation Treatment – IMRT – Not More Effective for Senior Citizens

New technologies adopted quickly as many believe newer treatments are better, but often there is a lack of studies to actually compare patient outcomes

Study’s lead author, Ronald Chen, M.D., M.P.H., assistant professor of Radiation Oncology in the UNC School of Medicine.

May 21, 2013 - Intensity-modulated radiation therapy has become the most commonly used type of radiation in prostate cancer, but new research suggests that the therapy may not be more effective than older, less expensive forms of radiation therapy in patients who have had a prostatectomy and were seniors age 66 or older.

The comparative effectiveness study, published online May 20 by JAMA Internal Medicine, evaluated the long-term outcomes of prostate cancer patients who received radiation treatments following prostatectomies using conformal radiation therapy (CRT) against the newer and more expensive intensity-modulated radiation therapy (IMRT).

Study leader Ronald Chen, MD, MPH, assistant professor of Radiation Oncology in the University of North Carolina School of Medicine, Chapel Hill, said the results showed little difference in the long-term health of patients who used the newer and older radiation therapies.

"Many prostate cancer patients need radiation treatment after prostatectomy, the surgical removal of the prostate, either because the cancer is aggressive or for recurrence. In prostate cancer, we have seen a trend in our healthcare system where new technologies are adopted quickly, maybe because there is a belief that newer treatments are better, but often there is a lack of studies to actually compare patient outcomes from older vs. newer treatments," said Dr. Chen.

 

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The study used Medicare data to compare the outcomes of 457 IMRT and 557 CRT patients treated between 2002 and 2007. The patients, 66 years of age or older who underwent radical prostatectomy and subsequent radiation therapy within three years of their surgery, showed no difference in regards to urinary side effects, bowel side effects, sexual dysfunction and other long-term side effects or cancer control.

"For patients with newly diagnosed prostate cancer who have chosen to receive curative radiation treatment, our prior study showed that IMRT was associated with less long-term side effects and better cancer control than CRT. However, for patients who have had a prostatectomy already, and subsequently need radiation treatment, this study shows that IMRT and CRT seemed to have similar outcomes," said Dr. Chen.

Prostate cancer is the most common malignancy among American men. Each year, 240,000 men are diagnosed and 30,000 die from the disease. Health care costs for treating prostate cancer have risen by $350 million a year, fueled in part by the adoption of new technology. This rise led the Institute of Medicine to identify comparative effectiveness research in prostate cancer as a top research priority.

Radiotherapy using IMRT offers promise because of its ability to deliver precise doses of radiation to the tumor. The ability of the radiation machine to deliver high doses of radiation to the tumor while minimizing the radiation exposure of surrounding tissues led to its rapid adoption as a clinical therapy for prostate cancer, because the prostate is situated near sensitive organs such as the bladder and rectum.

A lot of men across the United States who need radiation therapy after prostatectomy are not getting it, said Dr. Chen. He speculates that the cost of treatment may play a factor. While research shows that as many as one-third to one-half of the patients undergoing surgery for prostate cancer may benefit from radiation treatments subsequently to achieve a cure, Dr. Chen said that the data show only 10 to 15 percent of those who could benefit actually receive the therapy.

"If 3D conformal radiation provides an effective and safe treatment for these patients, then we can probably show that radiation is a very cost effective treatment and potentially remove one of the large obstacles to patients being able to get this necessary treatment after surgery," said Dr. Chen.

 

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