There is little evidence of a link between a positive mental attitude and a person's ability to survive cancer, researchers have found.

A new study, published in the British Medical Journal, reviewed 26 pieces of research to test popular beliefs about being positive.

The Glasgow-based researchers hoped to see if there was a link between survival from cancer and different psychological coping styles, such as "fighting spirit", hopelessness, denial and avoidance.

Breast, lung, and gastrointestinal cancers, as well as leukaemia and melanoma, were covered in the studies examined.

The researchers examined 26 studies on cancer

They also included data on follow up periods ranging between several months to 15 years.

The research team, led by Mark Petticrew of the Medical Research Council's Social and Public Health Sciences Unit in Glasgow, said a link between the way people cope with cancer and their chance of survival was "biologically plausible".

But they found little scientific basis for the belief that coping styles played an important part in survival from or recurrence of cancer.

The authors said: "It is commonly believed that a person's mental attitude affects his or her chances of surviving cancer and the psychological coping factors that are most well known in this respect are fighting spirit and helplessness/hopelessness.

"We found little convincing evidence that either of these factors play a clinically important part in survival from or recurrence of cancer; the significant findings that do exist are confined to a few small studies."

They said there was no good evidence to support the development of schemes that promoted certain mental attitudes to try to prolong survival.

And they concluded: "People with cancer should not feel pressurised in adopting particular coping styles to improve survival or reduce the risk of recurrence."