Scientists analysed data from seven studies involving a total of 542 women with breast cancer. They concluded that Chinese medicines may safely reduce the immuno-suppressive side effects of powerful anti-cancer drugs.

Some 60 per cent of women who undergo chemotherapy for breast cancer experience a range of side effects, including nausea, vomiting and fatigue. They may also suffer inflammation of the gut lining, reduced numbers of blood cells, and a weakened immune system.

A number of Chinese medicinal herbal mixtures and compounds are prescribed to counteract the unwanted effects of chemotherapy.

The research was conducted by Chinese scientists working for the Cochrane Collaboration, a UK-registered charity that specialises in reviewing scientific data. They said further trials were needed.