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黑种人结直肠癌发生率较高是由于较低的筛查率还是高危生物因素导致的目前还不清楚。为了评估黑种人在行软式乙状结肠镜检查阴性结果基础上患远端结肠肿瘤(腺瘤和/或癌)的可能性是否比白种人大。霍华德大学医学院的Laiyemo AO等人分析了起初PLCO筛查试验阴性而3年或5年后又进行软式乙状结肠镜检查复查的21 550例白种人和975例黑种人参与的数据,有息肉或包块者都会被要求做结肠镜检查。结果,在对行软式乙状结肠镜检测患者的随访中,304例黑种人(31.2%)
It is unclear whether the higher incidence of colorectal cancer in black is due to lower screening rates or high-risk biological factors. To assess whether blacks are more likely than Caucasians to develop distant colon tumors (adenomas and/or cancers) based on the negative results of sigmoidoscopy. Laiyemo AO et al. of Howard University School of Medicine analyzed the data of 21,550 Caucasians and 975 black people who were initially negative for the PLCO screening test and then reexamined by soft sigmoidoscopy 3 or 5 years later. Polyps or masses are required to do colonoscopy. As a result, in the follow-up of patients undergoing sigmoidoscopy, 304 black people (31.2%)