Women who have been diagnosed with breast cancer believe the risk of the disease occurring in their unaffected breast is as much as 10 times higher than it actually is. As a result, they are choosing to have prophylactic mastectomies based on a false perception of increased risk, according to new research.
However, Ajay Sahu MD, a consultant breast surgeon at the Frenchay Hospital in Bristol, UK, will tell the seventh European Breast Cancer Conference (EBCC7) that if the women are given time to think and counseling to help them understand their actual risk, they often decide against a prophylactic mastectomy. The results of his research could lead to a reduction in the numbers of prophylactic mastectomies, as well as saving women from unnecessary side-effects caused by the treatment.
Sahu reached his conclusions after conducting a study of 27 consecutive patients, between 31 years old and 65 years old, who were diagnosed with breast cancer between April 2007 and October 2009, and who were having surgery on one breast but were requesting that the other breast be removed too.
“I set out to do this study because the incidence of contralateral prophylactic mastectomy was increasing in my unit,” Sahu said. “I felt that the time of diagnosis was a moment of increased stress and not the right time to make such a decision. There are two aspects to this study. One is the patients’ perception of risk at the time of diagnosis and the other is whether this perception can be influenced by deferring the decision-making process.”
There is no evidence that women who have a single, small breast tumor or who are at low to moderate risk of developing a further breast cancer, gain any survival benefit from a mastectomy or a contralateral prophylactic mastectomy.
“The incidence of contralateral prophylactic mastectomy has almost doubled in recent times without any evidence of survival benefit and the reasons for this need to be addressed and alternative strategies considered,” Sahu said in a news release.
The reasons given by the 27 Frenchay patients for requesting a contralateral prophylactic mastectomy included: young age, but without a family history, lobular cancers, family history, which was deemed low risk by the surgeon, bad experience of treatment outcome among family or friends and a desire to avoid radiotherapy. All the patients thought that they would not live longer than 5 years, and all overestimated their risk of contralateral breast cancer by a factor of five to ten.
Sahu asked about the patients’ perception of risk and the reason behind a request for prophylactic mastectomy at the time of diagnosis and then the operation was deferred. Breast care nurses counseled the patients at the time of diagnosis and when the post-operative results and plans for adjuvant treatment were discussed. The patients received adjuvant chemotherapy and/or radiotherapy and were followed up at 6 months by the breast care nurses and at 12 months by the surgeon. At the end of 12 months those who still requested prophylactic surgery were offered the operation.
However, at the end of the 12 months all the patients were less anxious about their risk. Four patients were happy with the actual risk but still asked for prophylactic surgery. The remaining 23 patients were pleased to have had the opportunity to rethink and chose not to have prophylactic surgery.