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Aspirin
Aspirin (acetylsalicylic acid) has been used for many years as a painkiller. It also has an anti-inflammatory (消炎) action and can be used to reduce fever. Aspirin is already recommended for people to prevent stroke and heart attack because it improves one's blood circulation. So many people already take daily aspirin as a heart drug. Although aspirin can cause deadly internal bleeding, which is relatively rare, its benefits for people are great, not only to help increase the length of people's lives, but to prevent and treat cancer, or to stop cancer spread according to the latest research.
Taking a low dose (剂量) of aspirin every day can prevent and  Rothwell, from Oxford University, and his colleagues, who carried out the latest work, had already linked aspirin with a lower risk of certain cancers, particularly bowel（肠） cancer. But their previous work suggested people needed to take the drug for about 10 years to get any protection. Now the protective effect occurs much sooner—within three to five years—based on a new analysis of data from 51 trials involving more than 77,000 patients. And aspirin appears not only to reduce the risk of developing many different cancers in the first place, but may also stop cancers spreading around the body.
Taking a low (75 — 300mg) daily dose of aspirin appeared to cut the total number of cancer cases by 25 % after only three years—there were nine cancer cases per 1,000 each year in the aspirin-taking group, compared with 12 per 1,000 for those taking dummy pills. It also reduced the risk of a cancer death by 15% within five years (and sooner if the dose was higher than 300mg). And if patients stayed on aspirin for longer, their cancer death risk went down even further—by 37% after five years.
Low-dose aspirin also appeared to reduce the probability that cancers, particularly bowel, would spread to other parts of the body, and by as much as half in some instances. However, Prof. Rothwell says for most fit and healthy people, the most important things they can do to reduce their lifetime cancer risk is to give up smoking, take exercise and have a healthy diet.
But experts warn that there is still not enough proof to recommend it to prevent cancer cases and deaths and warn that the drug can cause dangerous side effects like stomach bleeding. Prof. Peter Johnson of Cancer Research UK, along with other experts, said it was still a good idea that people thinking of taking aspirin should first consult their doctors because of the possible side effect. And people should get some decisive advice from the government as to whether aspirin should be recommended more widely and the government should also advise the public about the benefits and risks of aspirin.

Aspirin
Functions	To reduce fever To        Pains To prevent stroke and        attack
effect	To cause cause deadly internal
Fresh         evidences	To cut the total number of cancer cases by         To       the risk of  certain cancers  within five years and of a cancer death by 15%  within five years and by 37% after five years. To make it          to prevent the spread of  cancer
opinion	People should discuss with their doctors     taking       aspirin. The public should be     about the benefits and risks of aspirin.