Brain radiotherapy affects mind 脑瘤放射线疗法伤及思想
文章来源:未知 文章作者:meng 发布时间:2009-08-10 06:21 字体: [ ]  进入论坛

Radiotherapy used to treat brain tumours1 may lead to a decline in mental function many years down the line, say Dutch researchers.


Radiotherapy is a common treatment for brain tumours
Radiotherapy is a common treatment for brain tumours

A study of 65 patients, 12 years after they were treated, found those who had radiotherapy were more likely to have problems with memory and attention.

Writing in The Lancet Neurology, the researchers said doctors should hold off using radiotherapy where possible.

One UK expert said doctors were cautious about using radiotherapy.

The patients in the study all had a form of brain tumour2 called a low-grade glioma(神经胶质瘤) - one of the most common types of brain tumour.

In these cases radiotherapy is commonly given after initial surgery to remove the tumour, but there is some debate about whether this should be done immediately or used only if the cancer returns.

It is known that radiation treatment in the brain causes some damage to normal tissue and the study's researchers suspected it could lead to decline in mental function.

A previous study in the same patients done six years after treatment found no difference in aspects like memory, attention and the speed at which people could process information, in those who had received radiotherapy.

But the latest research, carried out more than a decade after original treatment, did find significant variation in the results of several mental tests between those who had had radiotherapy and those who had not.

In all, 53% of patients who had radiotherapy showed decline in brain function compared with 27% of patients who only had surgery.

The most profound differences were in tests to measure attention.

Delaying treatment

With an average survival of ten years for this type of tumour, the researchers said patients undergoing radiotherapy were at considerable risk of developing problem years down the road(将来,今后).

One option for doctors would be to delay when patients received radiotherapy, reserving it in case the tumour returned, they advised.

"It always depends on the patient, but if it is possible to defer3 radiotherapy, maybe people should," said study leader Dr Linda Douw, from the Department of Neurology at VU University Medical Centre in Amsterdam.

But she added that more research was needed and there were trials under way to look at other treatments such as chemotherapy(化学疗法).

In an accompanying article, experts from the Mayo Clinic in Rochester, USA, said it was hard to draw conclusions because radiotherapy had improved since the patients in the study had been treated, but agreed more studies were needed.

Dr Jeremy Rees, a Cancer Research UK scientist at the National Hospital for Neurology and Neurosurgery Honorary said they would usually try to avoid giving radiotherapy to patients with low-grade glioma, unless the tumour was progressing or the patient had epilepsy(癫痫症) not controlled on standard medication.

"Surgery is generally a preferred option with chemotherapy or radiotherapy coming into play at a later stage, if the glioma progresses.

"Continued research and increased knowledge about the disease is enabling us to treat it increasingly effectively while reducing side effects."


1 tumours 6654305f758b5b5576a74cb007e8d079     
肿瘤( tumour的名词复数 )
  • Blood vessels develop abnormally in cancer tumours. 在癌肿瘤中血管出现不正常。
  • This apparatus scans patients' brains for tumours. 这台仪器扫描检查病人的脑瘤。
2 tumour tumour     
  • The surgeons operated on her for a tumour.外科医生为她施行了肿瘤切除手术。
  • The tumour constricts the nerves.肿瘤压迫神经。
3 defer KnYzZ     
  • We wish to defer our decision until next week.我们希望推迟到下星期再作出决定。
  • We will defer to whatever the committee decides.我们遵从委员会作出的任何决定。
TAG标签: mind brain radiotherapy