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The U.S. Study shows that Three-Week Course of Breast Radiation May Be as Effective as Conventional Five to Seven Week Course for Early Breast Cancers.

The study presented November 4, 2009, at the 51st Annual Meeting of the American Society for Radiation Oncology (ASTRO) shows a shortened, more intensive course of radiation given to the whole breast, along with an extra dose of radiation given to the surgical bed of the tumor (concomitant boost), has been shown to result in excellent local control at a median follow up of two years after treatment with no significant side effects.

"The observations to date suggest that a three-week course of radiation therapy with concomitant boost results in outcomes comparable to that of a five to seven week course for early stage-breast cancers. Additional studies with a larger body of data and longer follow-up period will help establish whether this type of radiation treatment should be routinely used," Manjeet Chadha, M.D., lead author of the study and a radiation oncologist at the Beth Israel Medical Center in New York, said.

This shorter treatment, called accelerated hypofractionated whole breast irradiation, is an especially attractive option because women can receive a full course of radiation therapy in half the time -- three weeks of daily treatments vs. five to seven weeks. In addition, the cost of this treatment is lower relative to the cost of the standard whole breast radiation and is also less expensive than other new approaches, such as partial breast irradiation (breast brachytherapy).

Many women with early-stage breast cancer undergo breast conserving therapy. Typically, this means they first have surgery to remove the visible cancer (a lumpectomy), and then receive a course of radiation therapy to kill any microscopic cancer cells that may remain. The standard whole breast radiation treatment takes 15 to 30 minutes every day, Monday through Friday, for five to seven weeks.

Findings show that the cancer did not return to the original site or to the surrounding region in these women. The median follow-up of the study was two years. Survival was greater than 95 percent for patients with five years of follow up. The study also shows there were no significant physical or cosmetic side effects from the radiation treatment.

Source: Reuters

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