结直肠腺瘤患者血清IGF-1和IGFBP-3的变化及其临床意义

目的:研究血清胰岛素样生长因子1(insulin-like growth factor1,IGF-1)和胰岛素样生长因子结合蛋白3(insulin-like growth factor binding protein3,IGFBP-3)在结直肠腺瘤患者中的变化及临床意义.方法:采用放射免疫法和免疫放射法分别检测120例结直肠腺瘤患者、48例结直肠癌患者及34例健康人外周血清IGF-1和IGFBP-3表达水平.结果:血清IGF-1和IGF-1/IGFBP-3比值在结直肠癌组(247.35±60.77;0.063±0.010)、腺瘤性息肉组(224.75±69.45;0.055±0.010)及健康对照组(195.39±63.37;0.047±0.013)依次降低,前两组明显高于后组,差异有统计学意义(P<0.05).腺瘤性息肉患者血清IGF-1、IGFBP-3水平及IGF-1/IGFBP-3比值与患者的性别、年龄、吸烟饮酒情况及肿瘤家族史临床指标间均无统计学意义;与息肉大小、数量、部位、组织学分类也无统计学意义.血清IGF-1和IGF1/IGFBP-3比值在结直肠癌组(247.35±60.77;0.063±0.010)、进展期腺瘤组(235.81±73.72;0.056±0.011)及早期腺瘤组(208.15±59.44;0.052±0.008)依次降低,且前两组较后组比,差异有显著性(P<0.05).结直肠腺瘤性息肉患者血清IGF-1和IGFBP-3呈正相关(r=0.796,P<0.001).结论:血清IGF-1和IGF-1/IGFBP-3比值增高可能在结直肠腺瘤癌变中起一定作用,对适龄人群行血清GF-1和IGF-1/IGFBP-3检测可以简单筛选有息肉恶变倾向者.     

血清IGF-1, IGFBP-3, PSA及fPSA在前列腺癌诊断中的意义

目的探讨胰岛素样生长因子-1（IGF-1）和胰岛素样生长因子结合蛋白-3（IGFBP-3）在前列腺癌（PCa）患者血清中的水平及其与前列腺特异抗原（PSA）、游离PSA（fPSA）联合检测的意义。方法采用化学发光法（CLIA）检测52例PCa患者、48例良性前列腺增生症（BPH）患者和48例健康对照者的血清IGF-1,IGFBP-3,PSA及fPSA水平。结果 PCa组IGF-1水平较BPH组、健康对照组明显升高（P＜0.01）,BPH组与健康对照组比较,差异无统计学意义（P＞0.05）;PCa组IGFBP-3水平低于BPH组和健康对照组（P＜0.01）,BPH组与健康对照组比较,差异有统计学意义（P＜0.01）。IGF-1及IGFBP-3诊断PCa的灵敏度分别为83.6%和76.4%,特异度分别为84.0%和74.0%,阳性预测值分别为85.2%和76.4%,阴性预测值分别为82.4%和74.0%。血清IGF-1与PSA或fPSA联合检测可明显提高诊断PCa的灵敏度。结论 PCa患者的IGF-1及IGFBP-3水平较健康对照者发生改变,IGF-1与PSA或fPSA联合检测更有助于PCa的诊断。     

肺腺癌患者血清IGF-1及IGFBP-3的测定及其与化疗疗效的关系

目的探讨肺腺癌患者血清中胰岛素样生长因子-1(IGF-1)和胰岛素样生长因子结合蛋白-3(IGFBP-3)的表达水平并比较分析其与化疗疗效的关系。方法采用ELISA法检测28例肺腺癌患者(A组),26例肺部良性疾病患者(B组)和20例健康人(C组)血清中IGF-1和IGFBP-3的含量。结果 A、B、C组血清IGF-1水平分别为(667.19±105.36)μg/L、(448.53±121.04)μg/L和(398.45±111.46)μg/L,A组明显高于B、C组,差异有统计学意义(P<0.05);B组与C组比较差异无统计学意义(P>0.05)。A、B、C组血清IGFBP-3水平分别为(3 003.17±998.23)μg/L、(3 875.43±1 017.43)μg/L和(3 964.53±1 089.73)μg/L,A组明显低于B、C组,差异有统计学意义(P<0.05);B组与C组比较差异无统计学意义(P>0.05)。12例化疗有效的患者,化疗2周期后IGF-1水平较化疗前降低,而IGFBP-3水平则较化疗前升高,但差异均无统计学意义(P>0.05)。结论血清IGF-1和IGFBP-3水平在肺腺癌的辅...     

过敏性紫癜患儿血清胰岛素样生长因子及胰岛素样生长因子结合蛋白-3的变化

目的 探讨胰岛素样生长因子(IGF)-1及胰岛素样生长因子结合蛋白(IGFBP)-3在过敏性紫癜(HSP)中的作用.方法 采用放射免疫法方法测定45例HSP患儿不同时期的血清IGF-1及IGFBP-3、C反应蛋白(CRP)水平.采用t检验和直线相关关系.结果 HSP急性发作组血清IGF-1[(452±183)μg/L]、IGFBP-3[(13 897±3124)μg/L]及CRP[(20±8)mg/L]水平升高,与健康对照组和缓解组比较,差异均有统计学意义(t值分别为3.42、4.10、11.17、11.63、8.59、9.86.P均<0.01);HSP缓解组血清IGF-1、IGFBP-3及CRP与健康对照组比较,差异无统计学意义(t=0.3,4、0.34、0.52,P均>0.05).HSP急性期并发肾损害组血清IGF-1[(621±253)μg/L]、IGFBP-3[(18 763±3173)μg/L]水平升高,与无肾损害组比较,差异有统计学意义(t值分别为4.21、7.26,P均<0.01),有胃肠道症组血清IGF-1[(479±192)μg/L]、IGFBP-3[(13 986±3162)μg/L]水平与无胃肠道症状组比较,差异无统计学意义(t值分别为0.83、0.16,P均>0.05);血清CRP水平在肾损害组与非肾损害组及胃肠道症组与无胃肠道症状组问差异均无统计学意义(t值分别为0.56、0.32.P均>0.05).HSP急性期患儿血IGF-1、IGFBP-3与CRP浓度之间呈直线正相关(r值分别为0.624,0.672,JP均<0.01).结论 IGF-1、IGFBP-3参与了HSP疾病的病理生理过程,血清IGF-1、IGFBP-3测定对紫癜性肾损害的诊断、病情监测及预后判断有一定帮助.

Abstract：

Objecfive To investigate the role of serum Insulin-like growth factor(IGF)-1,insulinlike growth factor-binding potein(IGFBP)-3 in children with Henoch-Schonlein purpura(HSP).Methods The serum concentration of IGF-1,1GFBP-3 was measured by enzyme-linked immunosorbent assay(ELISA)method in 45 acute SHP patients,40 recoverv patients and 30 healthy controls.Results The serum levels of IGF-1 [(452±183)μg/L],IGFBP-3 [(13 897±3124)μg/L] and C-reactive protein(CRP)[(20±8)mg/L]in acute phase were significantly higher than those in healthy controls(P<0.0 1)and higher than those during recovery period.The serum level of IGF-1,IGFBP-3 for the HSP patients dropped back slowly and their levels during recovery period were the same as those in healthy controls(P>0.05).The serum levels of IGF-1[(621±253)μg/L] and IGFBP-3[(18 763±3173)μg/L] were higher in the renal damage group than in the non-renal damage group(P<0.01).and the same in patients with gastrointestinal symptoms group as in patients without gastrointestinal symptoms group(P>0.05).whereas the serum level of CRP was not significantly different(P>0.05).The serum levels of IGF-1,IGFBP-3 showed positive correlation with the level of CRP(r=0.624,0.672,P<0.01).Conclusion The IGF-1 and IGFBP-3 may play an important role in the pathological mechanism of HSP.The level of IGF-1 may be used as an indicator for HSP disease activity and progression.IGF-1 mav have a close relation with the damage"of renaJ system in HSP.     

食管癌及胃癌患者化疗前后血清IGF-1、IGF-2、IGFBP-3水平检测

采用ELISA法检测70例食管癌及胃癌患者化疗前及化疗后6周血清中人胰岛素样生长因子(IGF-1、IGF-2)及胰岛素样生长因子结合蛋白-3(IGFBP-3)水平.发现化疗有效组及化疗无效组化疗前血清IGF-1、IGF-2、IGFBP-3水平与正常对照组比较均有统计学差异;与化疗前比较,化疗有效组化疗后IGF-1明显降低、IGFBP-3明显升高,而化疗无效组化疗后IGF-1明显升高、IGFBP-3明显降低.认为血清IGF-1水平降低、IGFBP-3水平升高与食管癌、胃癌化疗疗效呈正相关,可作为预测和评价化疗疗效的指标之一.     

肺癌患者胰岛素样生长因子1和胰岛素样生长因子结合蛋白3的表达及其临床意义

目的 分析肺癌患者血清和支气管肺泡灌洗液（BALF）中胰岛素样生长因子1（IGF-1）、胰岛素样生长因子结合蛋白3（IGFBP-3）的表达,探讨其在肺癌诊断和预后中的临床意义.方法 运用免疫放射法检测80例非小细胞肺癌患者和14名健康者（对照组）外周血血清与BALF中IGF-1、IGFBP-3的水平.结果 肺癌组血清和BALF中IGF-1表达显著高于对照组（P＜0.01）,IGFBP-3的表达显著低于对照组（P＜0.05）,同时IGF-1/IGFBP-3升高（P＜0.01）.IGF-1、IGF-1/IGFBP-3在有淋巴结转移、远处转移和TNMⅢ～Ⅳ的肺癌患者血清、BALF中明显高于无转移者和TNMⅠ～Ⅱ期者（P＜0.05）,而IGFBP3下降明显高于无转移者及TNMⅠ～Ⅱ期者（P＜0.05）.肺癌组血清IGF-1、IGFBP-3浓度与BALF中的浓度呈正相关（P ＜0.01）;患者血清BALF中IGF-1与IGFBP-3浓度呈负相关（P＜0.05）.结论 非小细胞肺癌患者血清和支气管肺泡灌洗液中IGF-1、IGFBP-3的表达对肺癌的诊断、判断预后有重要临床意义.     

老年男性骨质疏松患者血清瘦素、胰岛素样生长因子-1和胰岛素样生长因子结合蛋白-3表达的临床意义

目的观察骨质疏松(OP)老年男性患者血清中瘦素、胰岛素样生长因子(IGF)-1和IGF结合蛋白(IGFBP)-3的表达特征,关注其临床意义。方法 68例OP老年男性患者作为观察组,38例正常骨密度、无明显器质性疾病的老年男性作为对照组。抽取两组的空腹静脉血,检测血清中瘦素、IGF-1和IGFBP-3的表达。结果观察组中瘦素、IGF-1和IGFBP-3的表达明显低于对照组,观察组中伴有骨折患者血清中瘦素、IGF-1和IGFBP-3的表达明显低于不伴有骨折患者,相关分析显示瘦素和IGF-1、IGF-1和IGFBP-3的表达均呈正相关性。结论 OP老年男性患者血清中瘦素、IGF-1和IGFBP-3低表达,瘦素和IGF-1、IGF-1和IGFBP-3均具有协同作用,三种细胞因子均参与病变形成及进展。     

胰岛素样生长因子-Ⅰ、Ⅱ及其结合蛋白-3对慢性肝病的临床意义

目的探讨胰岛素样生长因子-I(IGF-1)、Ⅱ(IGF-11)及其结合蛋白-3(IGFBP-3)对慢性肝病的临床意义.方法肝硬化患者65例,按Child-Pugh分级法将其分为A(17例),B(20例)和C(28例);慢性肝炎组66例;原发性肝癌组32例;转移性肝癌组13例;对照组30例.应用免疫放射法检测空腹IGF-Ⅰ、IGF-Ⅱ和IGFBP-3水平.结果IGF-Ⅰ水平在肝硬化患者(100.49±38.11ng/ml)和原发性肝癌患者(166.07±121.04 ng/ml)明显低于对照组(352.55±153.61nS/ml),在慢性肝炎组(518.72±233.84ng/ml)和转移性肝癌组(694.95±327.14 ng/ml)较对照组明显升高;各组肝病患者IGF-Ⅱ水平与对照组比较无显著差异;IGFBP-3水平在肝硬化患者(45.02±16.21nmol/L)和原发性肝癌患者(52.92±26.32nmol/L)明显低于对照组(114.50±27.09nmol/L),在慢性肝炎组(102.84±25.90nmol/L)和转移性肝癌组(113.46±25.06nmol/L)与对照组比较无显著差异.结论IGF-Ⅰ和IGFBP-3对肝硬化患者的肝功损害程度有诊断价值,IGF-Ⅰ对慢性肝炎和肝癌有非特异性的辅助诊断作用,IGFBP-3与慢性肝炎、转移性肝癌无关,IGF-Ⅱ对各类肝病无诊断作用.     

老年住院病人血清胰岛素样生长因子-1、胰岛素样生长因子结合蛋白-3与衰弱的相关性研究

目的探讨老年住院病人血清胰岛素样生长因子-1(IGF-1)、胰岛素样生长因子结合蛋白-3(IGFBP-3)水平与衰弱的相关性。方法纳入2018年1月至2019年6月老年医学科年龄≥65岁的住院病人195例,进行衰弱表型评估和老年综合评估,采用ELISA法检测血清IGF-1、IGFBP-3水平,分析其与衰弱的相关性。结果与无衰弱、衰弱前期病人相比,衰弱病人血清IGF-1、IGFBP-3水平显著下降,差异有统计学意义(P<0.05)。有序多分类Logistic回归分析显示血清IGF-1(OR=0.943,95%CI0.894~0.994,P<0.05)、IGFBP-3(OR=0.397,95%CI0.259~0.607,P<0.001)水平与衰弱显著相关。结论血清IGF-1、IGFBP-3水平与老年住院病人衰弱显著相关,可能成为老年人衰弱的预测指标。     

格列吡嗪对2型糖尿病病人血清胰岛素样生长因子及其结合蛋白的影响

目的探讨格列吡嗪治疗对2型糖尿病病人血清胰岛素样生长因子（IGF）及其结合蛋白（IGFBP）的影响。方法采用病例对照及治疗前后自身对照研究,了解糖尿病病人空腹血清IGF-1、IGF-2和IGFBP-1、IGFBP-3水平及格列吡嗪治疗2周后的改变情况。其中糖尿病组40例,正常对照组90例,两组年龄无显著性差异,P＞0.05。结果与正常对照组比,糖尿病组治疗前IGF-1水平降低（234.41±141.78vs181.76±104.48ng/mlP＜0.05）,IGFBP-1水平升高(47.65±31.78vs68.82±43.18ng/ml,P＜0.01),IGF-2和IGFBP-3改变不明显。格列吡嗪治疗后IGF-I升高(181.8±104.5vs209.0±88.2ng/ml,P＜0.05);IGFBP-1则明显下降(68.82±43.18vs43.72±34.35ng/ml,p=0.001);IGF-II,IGFBP-3无明显变化。结论格列吡嗪治疗可改善2型糖尿病所导致的血清IGF-I和IGFBP-1水平改变。     

Possible roles of insulin,IGF-1 and IGFBPs in initiation and progression of colorectal cancer

AIM: To investigate the roles of serum insulin, insulinlike growth factor-1(IGF-1), and insulin-like growth factor binding proteins(IGFBPs) in the initiation and progression of colorectal cancer. METHODS: We determined serum insulin, IGF-1 and IGFBPs levels in 615 colorectal cancer patients and 650 control healthy donors by enzyme-linked immunosorbent assay(ELISA). In the meantime, their body mass index(BMI) and waist-to-hip ratio(WHR) were measured. RESULTS: Serum levels of insulin and IGF-1 as well as IGF-1/IGFBP-3 ratio in pre-operation patients were significantly elevated, but the level of IGFBP-3 was significantly decreased compared with normal controls and post-operation patients(P < 0.05 and P < 0.001,respectively). There is no significant difference(P > 0.05) in the levels of insulin, IGF-1, IGFBP-1, IGFBP-3 and IGF-1/IGFBP-3 between the patients with and without hepatic as well as distal abdominal metastases. WHR and BMI of colon cancer patients were positively and significantly correlated with the levels of insulin and IGF-1/IGFBP-3. In contrast, WHR and BMI were negatively correlated with IGFBP-3 level. CONCLUSION: The elevation of insulin, IGF-1 as well as IGF-1/IGFBP-3 ratio and the reduction of IGFBP-3 may be related to the initiation of colorectal cancer, but they are not related to the progression and outcome of the disease.     

Regulation of insulin-like growth factor binding protein-1 (IGFBP-1) in insulin-dependent diabetes mellitus

The aim of the present study was to characterize the effect of 44 h of hyperglycaemia on diurnal levels of insulin-like growth factor binding protein-1 (IGFBP-1), insulin-like growth factor-1 (IGF-1), growth hormone (GH) and glucagon in 7 well-controlled subjects with insulin-dependent diabetes mellitus (IDDM). Hyperglycaemia (15 mmol/l) was induced by a glucose infusion, while the degree of insulinisation was similar to that of a corresponding period with near normoglycaemia (6.9 mmol/l). Hyperglycaemia for 44 h did not alter the normal diurnal IGFBP-1 levels when the degree of insulinisation was unchanged. The diurnal secretion pattern of IGFBP-1 was preserved in both genders and without any difference between the control and hyperglycaemic periods. However, the IGFBP-1 levels were increased in these IDDM subjects despite a peripheral hyperinsulinemia. An inverse correlation was found between IGFBP-1 and peripheral insulin levels both during periods of rapid changes in IGFBP-1 and insulin concentrations (i.e. morning hours) as well as during the total 24-h sampling period. Total IGF-1 levels were low, but no further decrease was seen after 24 h of hyperglycaemia in the presence of unchanged insulin levels. In conclusion, the present study clearly shows that the increased IGFBP-1 level seen during poor metabolic control in IDDM is not caused by hyperglycaemia. Glucose levels per se do not influence either total IGF-1 or IGFBP-1 concentrations in well-insulinised diabetic patients.     

Role of growth hormone, insulin-like growth factor 1 and insulin-like growth factor-binding protein 3 in development of non-alcoholic fatty liver disease

Background and aims Pituitary dysfunction including growth hormone (GH) deficiency may be associated with non-alcoholic fatty liver disease (NAFLD). Since the relationships among GH, IGF-1, IGFBP-3, and development of NAFLD without hypopituitarism are unclear, we examined the role of these hormones in the development of NAFLD based on clinical, laboratory and liver histology data. Patients and methods A total of 55 consecutive patients (20 males and 35 females) with NAFLD. Results Aspartate amino transferase (AST), AST/ALT, platelet count and IGF-1, levels were significantly associated with differences in fibrosis, since these variables differed between stage 0–1 and stage 2–3 NAFLD. In multivariate analysis, platelet count (P = 0.0223, relative risk (RR), 5.899; 95% confidence interval (CI), 1.288–27.017), and IGF-1 (P = 0.0363, RR, 4.568; 95% CI, 1.101–18.945) showed significant associations with stage 2–3 NAFLD. Additionally, hyaluronic acid levels had a negative relationship with IGF-1 and the IGF-1/IGFBP-3 ratio. There was no relationship of fibrosis with GH level, but decreased GH (P = 0.0414, RR, 0.199; 95% CI, 0.042–0.989) was significantly associated with steatosis of stage 2–3. Low GH/IGF-1 and GH/IGFBP-3 ratios were found in advanced steatosis. Conclusion GH, IGF-1 and IGFBP-3 are associated with hepatic fibrosis and steatosis in NAFLD. Low levels of IGF-1 might be associated with fibrosis while low level of GH with hepatic steatosis.     

Serum insulin-like growth factor type 1, insulin-like growth factor-binding protein-1, and insulin-like growth factor-binding protein-3 concentrations in patients with thyroid dysfunction.

Thyroid hormones play a role in the regulation of insulin-like growth factor type 1 (IGF-1) and insulin-like growth factor-binding protein-3 (IGFBP-3) expression, and both IGF-1 and IGFBPs have been shown to be related to the function and growth of the thyroid. Our aim was to evaluate serum concentrations of IGF-1, IGFBP-1, and IGFBP-3 in patients with thyroid dysfunction before and after normalization of thyroid function. The study was performed in 86 patients with thyroid dysfunction (43 hyperthyroid and 43 hypothyroid patients) and 17 euthyroid subjects. Serum growth hormone (GH), insulin, IGF-1, IGFBP-1, and IGFBP-3 were measured in all patients before and after normalizing serum thyroid hormone concentrations. Hyperthyroid patients showed IGF-1 (198.8 +/- 17.0 microg/L) and IGFBP-3 levels (4.2 +/- 0.2 mg/L) similar to those found in the control group (217.9 +/- 20.3 microg/L and 4.2 +/- 0.3 mg/L, respectively). After therapy these levels significantly decreased to 156.6 + 11.1 microg/L (p < 0.01) and 3.3 +/- 0.1 mg/L (p < 0.001), respectively. IGFBP-1 concentrations were clearly higher than those found in controls (22.7+/- 2.6 vs. 5.7 +/- 1.5 microg/L, p < 0.001) and exhibited a significant reduction after therapy for thyroid hyperfunction (11.0 +/- 1.7 microg/L, p < 0.001). Patients with hypothyroidism showed serum concentrations of IGF-1 (161.5 +/- 13.1 microg/L, p < 0.05) and IGFBP-3 (3.2 +/- 0.3 microg/L, p < 0.05) significantly lower than those found in healthy volunteers. However, replacement therapy with levothyroxine did not induce any significant modification of these concentrations (152.6 +/- 10.6 microg/L and 3.2 +/- 0.2 mg/L, respectively). Similarly, patients with thyroid hypofunction exhibited raised levels of IGFBP-1 (15.5 +/- 0.9 microg/L, p < 0.05 vs. control group) that were significantly decreased after therapy (8.8 +/- 1.4 microg/L, p < 0.01). The results of the present study show that thyroid status affects GH/IGF axis. Hypothyroidism is associated with significant reductions of IGF-1 and IGFBP-3, and IGFBP-1 is elevated in both hypothyroidism and hyperthyroidism.     

先天性心脏病手术后生长激素-胰岛素样生长因子轴的变化

目的 探讨先天性心脏病患儿手术后生长激素（growth hormone）和胰岛素样生长因子（insulin-like growth factor，IGF）轴的变化及意义。方法 先天性心脏病25例，采用放射免疫测定法测定治疗前、手术治疗后3个月、6个月和1年空腹血IGF-1及胰岛素样生长因子结合蛋白-3（insulin-like growth factor binding protein-3，IGFBP-3）;对照组为正常儿童20名。结果 先天性心脏病患儿手术前血IGF-1和IGFBP-3浓度较正常儿童减低（P〈0.01）;先天性心脏病手术治疗后患儿的IGF-1和IGFBP-3浓度随着术后时间增加而逐渐提高，至1年时与同龄儿童持平，差异无统计学意义（P〉0.05）。结论 先天性心脏病患儿存在生长发育迟缓及生长激素-胰岛素样生长因子轴功能的紊乱能通过手术治疗纠正，从而改善先天性心脏病患儿生长发育。     

老年颈动脉粥样斑块与胰岛素样生长因子-1及血脂的相关性研究

目的探讨胰岛素样生长因子1(IGF1)对老年颈动脉斑块(CAP)的影响及其在脂代谢中的作用。方法检测48例经颅多普勒超声确诊的老年CAP患者的血清IGF1水平和血脂指标,并与40例无CAP的老年人对照,并将两组的数据进行相关性分析。结果老年CAP组血清IGF1水平明显低于对照组(P<0.05);而TC、TG、LDL水平均较对照组高(P<0.01);HDL水平无显著差异。斑块组TC、TG、LDL均与IGF1呈负相关;HDL与IGF1无相关性。结论脂代谢紊乱是动脉粥样斑块形成的主要危险因素,IGF1作为一种重要的循环内分泌多肽,参与CAP的形成及脂代谢的调节。     

Physical activity, insulin-like growth factor 1, insulin-like growth factor binding protein 3, and survival from colorectal cancer

BACKGROUND: Recent reports have shown that physical activity improves the outcome of patients with colorectal cancer as well as breast and prostate cancer. However, the mechanisms whereby physical activity reduces cancer mortality are not well established. METHODS: Incident cases of colorectal cancer were identified among participants of the Melbourne Collaborative Cohort Study, a prospective cohort study of 41,528 Australians recruited from 1990 to 1994. Information on tumour site and stage, treatments given, recurrences, and deaths were obtained from systematic review of the medical records. Baseline assessments of physical activity and body size were made, and cases with available plasma had pre-diagnosis insulin-like growth factor 1 (IGF-1) and insulin-like growth factor binding protein 3 (IGFBP-3) levels measured. We assessed associations between these hormones and colorectal cancer specific deaths with respect to physical activity. RESULTS: A total of 526 cases of colorectal cancer were identified, of which 443 had IGF-1/IGFBP-3 levels measured. Median follow up among survivors was 5.6 years. For the physically active, increasing IGFBP-3 by 26.2 nmol/l was associated with a 48% reduction in colorectal cancer specific deaths (adjusted hazard ratio (HR) 0.52 (0.33-0.83); p = 0.006). No association was seen for IGF-1 (adjusted HR 0.90 (0.55-1.45); p = 0.65). For the physically inactive, neither IGF-1 nor IGFBP-3 was associated with disease specific survival. CONCLUSIONS: This study supports the hypothesis that the beneficial effects of physical activity in reducing colorectal cancer mortality may occur through interactions with the insulin-like growth factor axis and in particular IGFBP-3.     

Serum concentrations of insulin-like growth factor-binding protein 5 in Crohn’s disease

AIM:To investigate serum insulin-like growth factorbinding protein 5(IGFBP-5)levels and intestinal IGFBP-5expression in patients with Crohn’s disease(CD).METHODS:We analyzed the serum concentrations and intestinal expression of IGFBP-5 in 42 patients with CD,of whom 26 had endoscopically or radiologically proven stricture formation.Nine of the 42 patients had active disease,with a Crohn’s disease activity index>150.Serum IGFBP-5 levels were analyzed in 20 healthy controls matched by sex and age to the CD patients.Serum IGFBP-5 was measured using an enzyme-linked immunosorbent assay.Intestinal tissue was obtained from patients through endoscopic biopsies.IGFBP-5expression was detected using immunohistochemistry and was scored semiquantitatively.RESULTS:The median serum IGFBP-5 concentrations of CD patients were significantly lower compared with healthy controls[median 7.2(IQR:5.5-11.3)ng/mL vs 11.3(8.0-44.6)ng/mL,P<0.001].There was no significant difference between median serum IGFBP-5levels in CD patients with or without stricture formation[6.9(5.5-11.3)ng/mL vs 7.8(5.3-10.1)ng/mL,P=0.815].The serum IGFBP-5 levels were not significantly different between patients with active disease and inactive disease[7.2(6.5-7.6)ng/mL vs 7.2(5.5-11.3)ng/mL,P=0.890].However,a significant correlation was observed between serum IGFBP-5 levels and platelet count(PLT)(r=0.319,P=0.0395).No significant correlation was found between tissue IGFBP-5 immunohistochemical staining intensity scores and serum IGFBP-5 levels.No significant difference was found when comparing the serum IGFBP-5 levels among the patients with different tissue IGFBP-5 staining scores(absent/very weak,weak,moderate or strong).There was a significant correlation between tissue IGFBP-5staining scores and white blood cell count(r=0.391,P=0.01)and PLT(r=0.356,P=0.021).CONCLUSION:Our results indicate that serum IGFBP-5 concentrations were lower in CD patients compared to healthy controls regardless of disease activity or the presence of stricture formation.