大肠癌在消化道肿瘤中占有重要地位，近几年据国内外报导有上升趋势。１９９５年统计，日本在女性癌症中大肠癌占第一位，男性仅次于胃癌、肺癌占第三位。在我国其发病率占第４～６位，上海１９８３年较１９６３年的发病率约增加３倍［１］。直肠癌在大肠癌中占６０％～７... Colorectal cancer occupies an important position in digestive tract cancers. According to reports from home and abroad, there has been an upward trend in recent years. In 1995, Japan accounted for the largest number of colorectal cancers in women’s cancers. Men ranked second only to gastric cancer and lung cancer. In China, its morbidity accounts for 4th to 6th, and Shanghai’s morbidity in 1983 increased by about 3 times compared with 1963 [1]. Rectal cancer in colorectal cancer accounts for 60% to 7...