结直肠息肉内镜下特点及治疗

背景与目的:结直肠痛是常见的肿瘤,近年来发病率呈上升趋势.多数结直肠癌起源于腺瘤性息肉,而息肉的发现和切除可降低结直肠癌的发病率.为此,我们探讨不同年龄组的结直肠息肉的临床和内镜特点以及内镜下治疗情况.方法:2009年1月-2010年1月在复旦大学附属肿瘤医院内镜科接受肠镜检查的患者5 152例,按年龄分为中青年组(＜60岁)和老年组(≥60岁).比较分析两组资料结直肠息肉的肠镜下特点和病理类型,以及内镜下息肉治疗情况.结果:老年组的结直肠息肉检出率和息肉癌变率(37.65%,11.18%)均高于中青年组(19.8%,7.43%),差异均有统计学意义(P=0.000).两组的息肉好发于直肠和乙状结肠(30.53%,29.62%;29.78%,25.29%),均以腺瘤性息肉为多(61.19%,36.99%);而数目多、广基≥2 cm以及病理为绒毛状腺瘤的息肉,癌变率较高.除息肉癌变和巨大息肉外,两组资料中80%以上息肉予肠镜下治疗(80.8%,91.3%)全部顺利完成,未有严重并发症发生.结论:结肠镜检查是发现并处理息肉的有效手段,腺瘤性息肉的形态、大小、数目和病理以及患者的年龄与腺瘤性息肉的恶变有一定关系;结直肠息肉应尽可能内镜下治疗,并定期随访,减少结直肠癌的发生.     

浙江省临海市2020—2021年重点人群结直肠癌筛查结果分析

目的：通过分析浙江省临海市首次适龄人群结直肠癌筛查的结果,为制定全县域大规模结直肠癌筛查策略提供参考依据。方法：2020—2021年,采用问卷评估及定性粪便隐血试验（fecal occult blood test,FOBT）的筛查方法,对临海市50～74岁目标人群进行结直肠癌筛查,并对初筛阳性人群进行全结肠镜检查,随后分析筛查结果。结果：2020—2021年,临海市共计完成初筛71 942人,有15 170人初筛阳性,男性初筛阳性率显著高于女性（χ2=724.005,P<0.001）,且60～69岁人群中初筛阳性率最高。结肠镜检查总体依从率为24.19%,男性和女性结肠镜检查依从率差异无统计学意义（χ2=0.256,P=0.613）,且结肠镜检查依从率随年龄增长逐渐下降。2020年—2021年,结肠镜下总病变检出率为52.92%,其中结直肠癌有47例,进展期结直肠腺瘤有333例,非进展期结直肠腺瘤有561例,非腺瘤性良性病变有1 001例;男性总病变检出率明显高于女性（χ2=82.451,P<0.001）;随年龄的增长,总病变检出率、进展期结直肠腺瘤、非进展期结直肠腺瘤检出...     

江苏宜兴地区大肠癌平均风险人群结肠镜筛查结果分析

[目的]探讨江苏宜兴地区平均风险人群中大肠肿瘤和大肠进展期肿瘤的发生情况和解剖部位分布情况。[方法]采用横断面研究设计。以江苏宜兴地区籍平均风险人群为研究对象,进行结肠镜检查。采用×。检验比较不同性别、不同年龄组大肠肿瘤和大肠进展期肿瘤解剖学部位分布情况。采用Logistic回归分析方法比较不同年龄组大肠肿瘤和大肠进展期肿瘤的发生风险,并分析远端结肠病变对近端结肠病变的预测作用。[结果]共纳入905例合格研究对象．大肠肿瘤和进展期肿瘤的发生率分别为34．5％和5_3％。远端结肠发生肿瘤和进展期肿瘤的比例均高于近端结肠。男性发生大肠肿瘤和进展期肿瘤的风险明显高于女性（P〈0．01）。随着年龄增长．大肠肿瘤和进展期肿瘤的发生风险均明显增加（P〈0．01）,远端结肠肿瘤和进展期肿瘤发生率增加的幅度均高于近端结肠。年龄增长与大肠肿瘤发生风险增加的关系主要表现在女性人群。在控制年龄、性别的影响后,远端结肠肿瘤患者发生近端结肠肿瘤的风险仍然明显高于远端结肠无病变者（OR=1．94,95％CI：1．30～2．88,P=0．001）,说明远端结肠肿瘤病变对于近端结肠肿瘤具有预测作用：远端结肠进展期肿瘤病变对于近端结肠进展期肿瘤的预测作用不明显。[结论]本研究具有较强的科学性和较高的可信度。研究结果为制定该人群的大肠癌筛查策略提供了科学依据。     

结直肠息肉摘除术后患者结肠镜复诊的依从性分析

目的 探讨结直肠息肉摘除术后患者结肠镜复诊依从性及其影响因素.方法 统计1 108例结直肠息肉摘除术后患者结肠镜复诊情况,并对可能影响依从性的因素进行统计学分析.结果 依从性好者354例(31.9％),依从性差者754例(68.1％).经统计学分析,依从行为与结直肠癌术史、操作医师资质有关,差异有统计学意义(P＜0.05);性别、年龄差异无统计学意义(P＞0.05).结论 此次调查结直肠息肉摘除术后结肠镜复诊依从性不高.有过结直肠癌术史,选择高年资医师手术者依从性相对较高.做好结直肠息肉术后患者的宣教工作,提升医师个人素养及威望,提高肠镜操作技巧及推广舒适内镜是提高结直肠息肉摘除术后复诊依从性的关键.     

铜川市王益区自然人群结直肠癌筛查结果分析

目的:探索铜川市王益区自然人群结直肠癌的发病情况,并通过积极干预降低结直肠癌的发病率和死亡率.方法:于2013年3月启动铜川市王益区结直肠癌早诊早治筛查工作,采用危险因素量化评估问卷调查表调查结合大便隐血试验(FOBT)的初筛和结肠镜检查的复筛结合作为结直肠癌筛查方案.结果:在应参加筛查的48 254人中,实际参加问卷调查29 580人,顺应率为61.30％ (29 580/48 254);实际大便检查人数24 672人,顺应率为51.13％ (24 672/48 254).初筛确定结直肠癌高危人群5 842人,占筛查人数的19.75％(5 842/29 580).初筛确定结直肠癌高危人群5 842人中有4 214人进一步做电子肠镜检查,顺应率为72.13％(4 214/5 842),检出肠道病变825例,检出率为19.58％ (825/4 214).从性别分布情况分析:男性结直肠病变的检出率显著高于女性(x2=248.260,P=0.000);从年龄分布情况分析:各年龄组结直肠病变检出率相比,差异具有统计学意义(x2=120.625,P=0.000);从病理类型和部位分布情况分析:病理类型所占比重从大到小依次为息肉(50.42％)、管状腺瘤(32.36％)、绒毛状腺瘤(7.15％)、高级别瘤变(6.30％o)、结直肠癌(3.76％);直肠病变分布所占比重从大到小依次为乙状结肠(27.64％)、直肠(24.36％)、降结肠(11.88％)、升结肠(10.55％)、横结肠(9.21％)、肝曲(6.30％)、脾曲(5.21％)、回盲部(4.85％).结论:通过开展本次结直肠癌早诊早治筛查工作,有助于提高结直肠早期癌变的诊断率,同时也为本市癌症筛查工作的开展积累了经验.     

结直肠腺瘤患者人体组成特点

目的 人体组成对结直肠腺瘤发病的影响尚不明确.本研究应用生物电阻抗分析(bioelectrical impedance analysis,BIA)检测结直肠腺瘤患者的人体组成,分析结直肠腺瘤的人体组成特点.方法 回顾性分析2014-01-01-2015-06 01香港大学深圳医院无症状行结肠镜筛查的患者292例,依据肠镜检查及息肉病理结果分为结直肠腺瘤组158例和正常对照组134例.记录吸烟、饮酒和药物服用史等,测量身高、体质量、腰围和臀围;应用BIA检测研究对象身体组成,比较结直肠腺瘤组与正常对照组在人体组成的差别,分析人体组成对结直肠腺瘤发病的影响.结果 结直肠腺瘤组腰围平均为(83.3±10.4) cm,高于正常对照组的(79.2±14.1) cm,P=0.015.在人体组成上,结直肠腺瘤组体脂率平均为(28.3±6.97)％,高于正常对照组的(26.2±6.41)％,P=0.034.结直肠腺瘤组腰臀脂肪比平均为0.91±0.065,正常对照组平均为0.88±0.059,P=0.024.结直肠腺瘤组患者体脂率超标的比例为75.9％,高于正常对照组的59.7％,P=0.003.结直肠腺瘤组腰臀脂肪比超标的比例为68.8％,正常对照组为56.7％,P=0.041.结论 结直肠腺瘤患者腰围增加,人体组成以体脂率和腰臀脂肪比升高为特征.     

定量粪便免疫化学试验筛查阈值对结直肠肿瘤早筛价值的影响

目的:分析定量粪便免疫化学试验（fecal immunochemistry test，FIT）筛查阈值对体检人群结直肠肿瘤早筛价值的影响。方法:以2017年07月至2021年06月在我院接受定量FIT检测并行肠镜检查的1 267例人群为研究对象，比较不同性质肿瘤的定量FIT数值和阳性率。通过Logistic 回归和受试者工作特征（receiver operating characteristic，ROC）曲线分析比较不同性别、年龄和不同阳性阈值下定量FIT对进展期肿瘤的筛检效能。结果:定量 FIT筛查阳性率为4.7%，阳性人群肠镜依从性为22.2%。结直肠癌患者的定量FIT数值高于进展期腺瘤和其他肠镜结果。当定量FIT水平为100~199 μg/L、200~299 μg/L、300~499 μg/L和500 μg/L以上时，患进展期肿瘤的风险分别是<100 μg/L时的4.296倍、4.121倍、6.506倍和10.474倍。不同阳性阈值下，FIT阳性组进展期肿瘤检出率均高于阴性组，且在男性和50~75岁人群中均有统计学差异。在100 μg/L时的比值比（odds ratio，OR）最大（总体OR=6.817，95%CI:2.727~17.040；男性OR=5.570，95%CI:2.198~14.115；50~75岁OR=10.178，95%CI:3.158~32.803）。此时，定量FIT对进展期肿瘤的灵敏度分别为94.7%、93.0%、96.2%，特异度分别为27.6%、29.6%、28.7%。当阳性阈值由100 μg/L升高至500 μg/L时，FIT诊断进展期肿瘤的灵敏度下降，特异度升高，但阳性预测值和阴性预测值变化不大。结论:定量FIT阳性阈值在100 μg/L时筛查进展期结直肠肿瘤的灵敏度较好，但特异度较低，是应用在体检人群伺机性筛查中较好的结直肠肿瘤早筛参考指标。     

结直肠腺瘤、腺癌与腰围及腰臀比的关系

目的：研究腰围（WC）、腰臀比（WHR）与结直肠腺瘤、腺癌危险性之间的关系。方法：采用病例对照研究。所有结直肠腺瘤、腺癌的患者均查结肠镜活检病理证实,对照为与病例相同医院的同期就诊,结肠镜结果正常健康人群。观察组与对照组各140例,1∶1匹配。同时对腰围和臀围进行测量。采用多元 Logistic 回归模型对患者腰围、腰臀比与结直肠腺瘤、腺癌的比值比（OR）及其相应的95％可信区间进行估计。结果：腹型肥胖者（腰围＞85 cm）与正常腰围者（腰围≤85 cm ）相比,发生结直肠腺瘤、腺癌的 OR ＝0．98,95％CI：0．91～1．33;与正常体型者（腰臀比＜0．9）相比较,向心性肥胖者（腰臀比≥0．9）与发生结直肠腺瘤、腺癌的危险性增加有关（OR ＝1．16,95％CI：1．02～1．87,P ＜0．05）。结论：向心性肥胖为结直肠腺瘤、腺癌的一个危险因素。     

广东省佛山市顺德区某街道大肠癌筛查结果分析

目的 对广东省佛山市顺德区容桂街道特定年龄组高危人群进行大肠癌筛查.方法 自2013年7月1日至2016年6月30日,本院对广东省佛山市顺德区容桂街道40～75岁常住居民,采用问卷调查和免疫法粪便潜血试验进行初步筛查,初筛阳性者行结肠镜检查,并对筛查结果进行分析.结果 初筛4016人,初筛应答率为50.1％,问卷调查者为3014人(75.05％),FOBT为1002人(24.95％),筛查结果阳性人数为702人,初筛阳性率17.48％.肠镜筛查顺应率为50.7％(356/702),肠镜病变总检出率为31.46％(112/356),结直肠癌检出率为1.69％ (6/356),其中乙状结肠癌2例(0.56％),乙状结肠早期癌2例(0.56％),直肠早期癌2例(0.56％),结直肠息肉88例(24.72％),其中76例(21.35％)为1级～3级腺瘤性息肉,12例(3.37％)为炎性息肉.结直肠炎15例(4.21％),结直肠黑变病3例(0.84％).结论 大肠癌筛查可以有效发现结直肠癌及癌前病变.     

亚太结直肠癌风险评分系统在我国北方无症状人群筛查中的应用北大核心CSCD

[目的]评价亚太结直肠癌筛查评分系统(APCS)在我国北方无症状人群筛查中的应用价值。[方法]采取整群抽样的方法,选取河南省40~74岁城市户籍无症状人群进行癌症危险因素调查和结肠镜检查,应用APCS计算每位研究对象患进展期肿瘤的危险分值,绘制受试者工作特征(ROC)曲线,并计算曲线下面积(AUC)和95%可信区间(95%CI),并采用Logistic回归分析计算不同危险分层中患结直肠进展期肿瘤的OR值及95%CI。[结果]共纳入无症状人群7 454例,接受结肠镜检查前评分,平均年龄(55.01±7.91)岁,进展期肿瘤检出率为1.50%。APCS分值范围为0~7分,预测的一致性好(P=0.886),区分能力一般(AUC为0.628,95%CI:0.579~0.678),但优于仅基于年龄变量的预测模型。以低风险组(0~1分)为对照组,中风险组(2~3分)和高风险组(4~7分)发生进展期肿瘤的风险分别为低风险组的1.97倍(95%CI:0.83~4.65)和4.07倍(95%CI:1.76~9.42)。[结论]基于年龄、性别、一级亲属结直肠癌家族史和吸烟构建的APCS是确定中国北方无症状人群进展期肿瘤风险的有用工具。     

上海市宝山地区社区居民大肠癌筛查结果分析

目的:分析上海市宝山地区社区居民大肠癌筛查结果,探究国内大肠癌筛查模式在大肠癌诊断中的临床意义.方法:选取2017年06月至2019年06月上海市宝山地区按照社区大肠癌筛查流程完成筛查且评定为初筛阳性,并至我院完成全结肠镜诊断性检查且获取检查结果的人群作为研究对象,共769例.根据肠镜结果,分成病变组和正常组,分析两组...     

Genetic variation in base excision repair genes and the prevalence of advanced colorectal adenoma

Base excision repair (BER) corrects DNA damage caused by oxidative stress and low folate intake, which are putative risk factors for colorectal neoplasia. To examine the relationship between genetic variation in BER genes and colorectal adenoma risk, we conducted a case-control study of 767 cases of advanced colorectal adenoma and 773 controls from the baseline screening exam of the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial. Cases included participants diagnosed with advanced left-sided adenoma, and controls were subjects without evidence of a left-sided polyp by sigmoidoscopy, frequency-matched to cases on race and gender. Twenty single nucleotide polymorphisms were genotyped in four BER genes (APEX1, PARP1, POLB, and XRCC1), and conditional logistic regression was used to estimate odds ratios (OR) and 95% confidence intervals (95% CI) for the association with colorectal adenoma. Two variants with possible functional significance were associated with risk. The APEX1 51H variant was associated with a borderline significant decreased risk of colorectal adenoma (OR, 0.66; 95% CI, 0.44-1.00), and the XRCC1 399Q variant was inversely associated with risk among Caucasians (OR, 0.80; 95% CI, 0.64-0.99). Homozygotes at two PARP1 loci (A284A and IVS13+118G>A) were also associated with a decreased risk of colorectal adenoma compared with wild-type carriers (OR, 0.70; 95% CI, 0.49-0.98 for both), which was restricted to advanced adenomas displaying histologically aggressive characteristics (OR, 0.51; 95% CI, 0.33-0.78, P = 0.002 for PARP1 A284A). This study suggests that polymorphisms in APEX1, XRCC1, and PARP1 may be associated with advanced colorectal adenoma.     

Is metabolic syndrome a risk factor for colorectal adenoma?

BACKGROUND AND AIMS: Epidemiologic studies provide evidence for a link between obesity or diabetes and the risk for colorectal cancer. However, there is a lack of information about the relationship between metabolic syndrome and colorectal adenoma. Therefore, we investigated whether metabolic syndrome is a risk factor for colorectal adenoma. METHODS: We did a study for consecutive subjects who underwent colonoscopy as a screening exam at the Center for Health Promotion, Samsung Medical Center, from March 2004 to December 2005. According to the modified ATP III criteria, metabolic syndrome was diagnosed. We classified a total of 2,531 subjects into the adenoma group (n = 731) and the control group (n = 1,800), including normal colonoscopic finding, nonpolyp benign lesions, or histologically confirmed hyperplastic polyp. RESULTS: The prevalence for metabolic syndrome was 17% in the adenoma group and 11% in the control group. On the multiple logistic regression analyses, metabolic syndrome was found to be associated with an increased risk of colorectal adenoma (odds ratio, 1.51; 95% confidence interval, 1.18-1.93). Also, waist circumference among the individual components of metabolic syndrome was an independent risk factor for colorectal adenoma. An increased risk for metabolic syndrome was more evident for proximal than distal colon, for multiple (>/=3), and for advanced adenoma in the adenoma group. CONCLUSION: Metabolic syndrome was associated with colorectal adenoma. Abdominal obesity of the individual components of metabolic syndrome was an important risk factor for colorectal adenoma.     

The your disease risk index for colorectal cancer is an inaccurate risk stratification tool for advanced colorectal neoplasia at screening colonoscopy

Tailoring the use of screening colonoscopy based on the risk of advanced colorectal neoplasia (ACN) could optimize the cost-effectiveness of colorectal cancer (CRC) screening. Our goal was to assess the accuracy of the Your Disease Risk (YDR) CRC risk index for stratifying average risk patients into low- versus intermediate/high-risk categories for ACN. The YDR risk assessment tool was administered to 3,317 asymptomatic average risk patients 50 to 79 years of age just before their screening colonoscopy. Associations between YDR-derived relative risk (RR) scores and ACN prevalence were examined using logistic regression and χ(2) analyses. ACN was defined as a tubular adenoma ≥1 cm, tubulovillous or villous adenoma of any size, and the presence of high-grade dysplasia or cancer. The overall prevalence of ACN was 5.6%. Although YDR-derived RR scores were linearly associated with ACN after adjusting for age and gender (P = 0.033), the index was unable to discriminate "below average" from "above/average" risk patients [OR, 1.01; 95% confidence interval (CI), 0.75-1.37]. Considerable overlap in rates of ACN was also observed between the different YDR risk categories in our age- and gender-stratified analyses. The YDR index lacks accuracy for stratifying average risk patients into low- versus intermediate/high-risk categories for ACN. Cancer Prev Res; 5(8); 1044-52. ?2012 AACR.     

Meat intake and the recurrence of colorectal adenomas.

A large multicenter randomized controlled trial was re-assessed to check whether meat intake and a reduction in its consumption are associated with recurrence of adenomatous polyps of the large bowel, which are precursors of most colorectal malignancies. All subjects (n = 1905; 958 interventions and 947 controls) had one or more histologically confirmed colorectal adenomas removed during a colonoscopy within 6 months before randomization. The subjects were followed-up for approximately 4 years after randomization and a colonoscopy for detecting adenomas was conducted at the 1st and 4th year after randomization. Dietary variables were assessed at baseline (T0) and in conjunction with annual visits at the end of the 1st (T1), 2nd (T2), 3rd (T3) and 4th (T4) years. Odds ratios using logistic regression models for meat variables were estimated based on the average intake at T0, T1, T2, T3 and T4 (prior to the T4 colonoscopy) as well as change (T0-T4) in intake. In the intervention group, the total reduction in median intake of red meat from T0 to T4 was observed by the end of 1st year itself (30 and 31% for men and women, respectively). The analysis provide no evidence to suggest that lower intake or reduction in total and in red meat consumption during a period of 4 years reduces the risk of adenoma recurrence (including multiple or advanced adenoma), whereas the data suggest that high intake of fish is associated with lower risk of adenoma recurrence.     

Serum IGF1, IGF2 and IGFBP3 and risk of advanced colorectal adenoma

The insulin-like growth factor (IGF) signaling pathway is involved in cell proliferation and differentiation. Elevated serum IGF1 levels have been associated with increased colorectal cancer risk; however, studies of this association with colorectal adenoma are inconclusive. We examined serum IGF1, IGF2 and IGFBP3 levels in relation to risk of advanced colorectal adenoma in a case-control study within the prostate, lung, colorectal and ovarian cancer screening trial. A total of 764 advanced, left-sided colorectal adenoma cases and 775 controls frequency-matched on gender and ethnicity, without evidence of a left-sided polyp on sigmoidoscopy were included in the current study. Serum levels of IGF1, IGF2 and IGFBP3 were measured using an enzyme linked immunosorbent assay in serum samples collected at baseline. Logistic regression was used to estimate the odds ratios (OR) and 95% confidence intervals (CI) for the associations adjusting for age, race, sex, year of blood draw, body mass index, smoking and education. Higher IGF1 levels were associated with increased adenoma risk: ORs = 1.58 (95% CI = 1.16-2.16), 1.42 (95% CI = 1.04-1.93), and 1.80 (95% CI = 1.30-2.47) for the second, third and fourth quartiles, respectively (p(trend) = 0.002). Elevated IGF2 levels were also associated with increased adenoma risk (OR = 1.43, 95% CI = 1.05-1.96 for the fourth vs. first quartile, p(trend) = 0.02), but the association was no longer significant after adjustment for IGF1 (p(trend) = 0.28). IGFBP3 levels were not associated with adenoma risk. Our analysis showed a significant positive association between circulating IGF1 levels and risk of advanced colorectal adenoma, suggesting that IGF1 is associated with the pivotal precursor to colorectal cancer.     

Cigarette smoking and other behavioral risk factors for recurrence of colorectal adenomatous polyps (New York City,NY, USA)

Adenomatous polyps (hereinafter referred to as adenomas) are known precursors of colorectal cancer. Cigarette smoking has been associated with adenomas but not with colorectal cancer, while alcohol and fat intake have been associated with both adenomas and cancer in some studies. Approximately 30 percent of patients with resected adenomas develop another adenoma within three years. This case-control study explores the association of cigarette smoking with adenoma recurrence. Between April 1986 and March 1988, we administered a questionnaire to colonoscoped patients aged 35 to 84 years in three New York City (NY, USA) practices. We compared 186 recurrent polyp cases (130 males, 56 females) and 330 controls (187 males, 143 females) who had a history of polypectomy but normal follow-up colonoscopy, by cigarette-smoking pack-years adjusted for possible confounders. Risk for a metachronous or recurrent adenoma was significantly greater in the highest quartile of smokers than in never-smokers among both men (odds ratio [OR]=1.8,95 percent confidence interval [CI]=1.0–3.4) and women (OR=3.6, CI=1.7–7.6). Adjustment for time since smoking cessation reduced risk only slightly, as did adjustment for dietary fat intake, which itself remained significant. No association was found between alcohol intake and risk of recurrence. Cigarette smokers appear to have an elevated risk of adenoma recurrence that is not eliminated entirely by smoking cessation. Intervention trials that use adenoma recurrence as an endpoint should take smoking into account.This work was supported in part by grants from the National Cancer Institute (RO1-CA37196 and ST34CA09529) and the Aaron Diamond Foundation.     

Colonoscopy Screening Results in at Risk Iranian Population

Objectives: To investigate the prevalence of colorectal adenomas and other advanced lesions in first degreerelatives of Iranian patients diagnosed with colorectal cancer by colonoscopy and pathologic evaluation. Methods:Iranian colorectal cancer patients (probands) were identified through pathologic reports of the regional cancerregistry. First degree relatives (siblings, parents and offspring) of probands were evaluated for the existence ofpolyps and precancerous lesions via colonoscopy screening. Control patients were chosen among average riskpopulation with no family history of colorectal cancer who agreed to colonoscopy screening. Results: A total of184 subjects underwent colonoscopy screening from April 2007 to March 2009. From 90 cases among familiesof probands, 70 (77.8%) had a normal colonoscopy result, 18 (20%) demonstrated polyps and 2 (2.2%) werediagnosed with colorectal cancer. Colonoscopy screening in 94 average risk control patients discovered polypsin 4 (4.3%) cases and the other 90 (95.7%) patients had normal total colonoscopy results. Mean age of caseswith advanced lesions was 48.4±10.2 and 41.5±18.4 in control patients with polyps. The incidence of polyps wassignificantly higher in males, and in family case patients compared to controls. Conclusions: Based on colonoscopyscreening, the prevalence of colorectal adenoma and precancerous lesions in first degree relatives of patientsdiagnosed with colorectal cancer is significantly higher than in the average risk population.     

天津市大肠癌筛查初步结果分析

目的:在40～74岁天津市自然人群中开展大肠癌筛查,评价问卷调查、大便潜血检查（stooloccultbloodtest ,FOB ）和全结肠镜检查的筛查效果,为探索大肠癌筛查策略提供参考。方法:筛查方法采用问卷调查结合FOB 的两步筛查模式,经初筛确定的高危人群行全结肠镜检查明确诊断。结果:2012年5 月至2014年12月,实际完成初筛2 117 304 例,初筛顺应性39.72% ;检出高危人群126 118 例,高危人群比例5.96% ;全结肠镜检查25837 例,检出腺瘤8 095 例,进展期腺瘤1 236 例、伴中重度异型增生的其他病变134 例、早期癌112 例、晚期癌336 例,早诊率为81.52% 。结论:天津市大肠癌筛查方案可以显著浓缩大肠癌高危人群,提高全结肠镜检查的阳性率,节省医疗资源。