自阿司匹林问世一百年来,关于其治疗作用不断有新发现。在近十年,许多回顾性研究报道定时服用阿司匹林人群的结肠、直肠癌发生率或死亡率降低40%～50%,但达到预防作用所需的准确剂量尚不清,有学者认为每天约需300ｍｇ。动物研究也表明阿司匹林和其他非甾体类抗炎药(ＮＳＡＩＤ? Since the advent of aspirin for more than a hundred years, new discoveries have been made regarding its therapeutic effects. In the past decade, many retrospective studies have reported a 40% to 50% reduction in the incidence of colon and rectal cancer in people taking aspirin at regular intervals. However, the exact dose needed to achieve preventive effects is still unclear, and some scholars believe that the daily dose is approximately 300mg. Animal studies have also shown that aspirin and other non-steroidal anti-inflammatory drugs (NSAID?