The standard therapy for prostate cancer is called intensity modulated radiation therapy (IMRT). Stereotactic body radiotherapy (SBRT) is a newer treatment that delivers a greater dose of radiation than IMRT. Patients receiving SBRT can complete an entire course of treatment in one to two weeks, compared to seven to nine weeks for IMRT. There have been few studies comparing the costs of these treatments, and their toxicity.
This new study - published in the March 10 Journal of Clinical Oncology by researchers at the Cancer Outcomes, Public Policy and Effectiveness Research (COPPER) Center at Yale Cancer Center - compared IMRT to SBRT in a national sample of 4,005 Medicare patients age 66 and older receiving prostate cancer treatment. Participants received either SBRT or IMRT as a primary treatment for prostate cancer during 2008 to 2011.
"All the reports we have about the toxicity of SBRT comes from pioneering institutions," said first author Dr. James Yu, assistant professor of therapeutic radiology at Yale Cancer Center. "But now that SBRT is being used nationally, it is important to determine the costs and complications on a national level."
Yu, senior author Dr. Cary Gross and their colleagues found that the mean per-patient cost to Medicare for a course of SBRT was about $13,600, compared to $21,000 for IMRT. The team found that at 24 months after the start of the treatment, there were increased side effects for SBRT compared to IMRT, due to urethral irritation, urinary incontinence, and obstruction. However, even when including the cost of treating complications, the overall medical costs due to SBRT were still lower than that of IMRT.
"While these data are by no means definitive, our findings emphasize the need to carefully assess the impact of new cancer treatment technologies in actual practice," said Gross, professor of internal medicine at Yale School of Medicine, and director of the Yale COPPER Center at Yale Cancer Center.
Other authors on the study include Laura Cramer, Jeph Herrin, Pamela Soulos, and Arnold Potosky. Gross is the director of the Cancer Outcomes, Public Policy, and Effectiveness Research (COPPER) Center at the Yale Cancer Center.
The study was funded by a grant from the National Cancer Institute (R01CA149045).
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