雌激素受体在人类垂体腺瘤中的表达

目的检测雌激素受体(estrogen receptor,ER)在人类不同类型激素垂体腺瘤中的表达,探讨垂体腺瘤中分泌不同类型激素的腺瘤细胞与ER免疫组化阳性细胞之间的关系.方法采用免疫组化S-P法对53例垂体腺瘤标本进行激素分型,检测垂体腺瘤中ER蛋白的表达.采用免疫组化双标法检测多激素分泌型垂体腺瘤中垂体激素合并ER表达的情况.结果53例垂体腺瘤标本中,部分PRL(5/7)、FSH(2/3)、LH(1/1)单激素腺瘤及部分多激素腺瘤有ER蛋白表达,而全部GH、ACTH、TSH单激素腺瘤均无ER蛋白表达,4例无功能腺瘤无ER蛋白表达.在33例多激素型垂体腺瘤标本中,22例有ER蛋白表达,其中PRL ER双标染色阳性标本10例、LH ER双标染色阳性标本9例、FSH ER双标染色阳性标本7例、GH ER双标染色阳性标本2例,33例标本的ACTH ER和TSH ER的双标染色均为阴性.结论垂体腺瘤患者的性别不影响肿瘤组织中ER蛋白的表达.垂体腺瘤中,分泌PRL、LH或FSH的垂体腺瘤细胞可表达ER;分泌ACTH或TSH的垂体腺瘤细胞不表达ER;分泌GH的垂体腺瘤细胞是否表达ER可能与该垂体腺瘤是否同时分泌PRL有关.ER在PRL、LH及FSH垂体腺瘤细胞的发生、发展中发挥作用.     

survivin、p53蛋白在结直肠肿瘤中的表达及其临床意义

目的 检测survivin和p53蛋白在结直肠肿瘤中的表达,探讨其相互关系.方法 收集结肠镜活检的结直肠腺瘤及结直肠腺瘤并发结直肠癌组织蜡块各30例,另取30例正常结直肠黏膜组织作对照.采用链霉菌抗生物索蛋白-过氧化酶连接免疫组织化学方法检测survivin和p53蛋白表达情况.结果 survivin、p53蛋白在结直...     

凋亡相关基因survivin、bcl-2及caspase-3在胆囊癌中的表达及意义

目的探讨凋亡相关基因survivin、bcl-2及caspase-3在胆囊癌中的表达及其在胆囊癌发生、发展的可能作用及相互关系。方法应用免疫组织化学SABC法,检测39例胆囊癌组织、15例胆囊腺瘤组织和12例慢性胆囊炎组织中survivin、bcl-2及caspase-3表达情况,分析其与胆囊癌临床病理的关系,并探讨survivin、bcl-2及caspase-3表达在胆囊癌中的相关性。结果survivin在胆囊癌中的阳性表达率为71.8%,而在胆囊腺瘤及慢性胆囊炎中均无表达;bcl-2在胆囊癌中的表达阳性率为71.8%,而在胆囊腺瘤及慢性胆囊炎中均无表达;bcl-2在胆囊癌中的表达阳性率为38.5%,在胆囊腺瘤中为93.3%,在慢性胆囊炎中为8.3%,胆囊腺瘤bcl-2表达明显高于胆囊癌(P<0.01),胆囊癌bcl-2表达明显高于慢性胆囊炎组织(P<0.05)。caspase-3在胆囊癌中的表达阳性率为43.6%,胆囊腺瘤及慢性胆囊炎中caspase-3表达率均为100%。survivin表达与患者的临床病理无关。bcl-2及caspase-3的表达与胆囊癌患者的性别、年龄、肿瘤的大小无关,而阳性率在组织分化程度、不同Nevin分期组间差异有显著性(P<0.05)。survivin与bcl-2及caspase-3表达没有相关性(P>0.05),bcl-2与caspase-3表达具有良好的相关性(P<0.05)。结论survivin和bcl-2在胆囊癌中有较高表达,而caspase-3在胆囊癌中的表达下降;bcl-2与caspase-3可反映胆囊癌的某些临床病理特点;survivin、bcl-2及caspase-3共同调节胆囊癌细胞凋亡,进而影响胆囊癌的发生、发展。     

PPAR-γ和survivin基因表达与直肠癌进展的关系

目的探讨过氧化物酶体增殖因子活化受体(PPAR)-γ和存活素(survivin)基因表达与直肠癌进展的关系。方法选取该院自2011年5月至2015年5月临床以及病理资料均齐全并经手术切除方式获得的直肠癌患者大体石蜡标本85例,取同期手术切除的腺瘤组织82例以及同期接受痔上黏膜环切手术治疗后的良性病变组织80例。采用免疫组织化学法分析PPAR-γ及survivin蛋白表达,分析其与患者病理特征的关系,采用Logistic回归分析PPAR-γ及survivin蛋白表达的相关因素。结果癌组织的PPAR-γ及survivin蛋白表达的阳性率明显高于正常组织及腺瘤组织(P<0.05)。正常组织与腺瘤组织PPAR-γ及survivin蛋白表达的阳性率比较差异无统计学意义(P>0.05)。直肠癌患者PPAR-γ及survivin蛋白表达与病理情况的分化程度、淋巴结转移及Dukes分级有关,而与年龄及性别无关。Logistic回归分析法显示,影响直肠癌患者PPAR-γ及survivin蛋白表达的相关因素有低分化、有淋巴结转移以及Dukes分级为C~D级。结论 PPAR-γ和survivin在直肠癌患者组织中高表达,与直肠癌患者的疾病进展有较大关联。     

Survivin与COX-2在食管鳞癌中的表达及其相关性研究

目的探讨凋亡抑制基因survivin在食管鳞癌组织中的表达及其与环氧合酶-2(COX-2)的相关性。方法采用免疫组化S-P法检测68例食管癌组织及15例正常食管黏膜组织中survivin蛋白和COX-2蛋白的阳性表达率。结果survivin蛋白在15例正常食管黏膜中呈阴性表达,而68例食管癌组织中45例阳性,占66.1%,差异有显著性。COX-2蛋白在食管癌组织中的阳性表达率为79.4%(54/68)。survivin蛋白阳性率与年龄、性别、原发部位无关,而与分化程度、有无淋巴结转移相关,并与COX-2蛋白阳性表达呈正相关。(Pearson列联系数为0.434)。结论survivin蛋白在食管癌的发生发展中起重要作用,survivin蛋白与COX-2蛋白密切相关,2者可能存在共同的激活机制,构成肿瘤细胞凋亡的多种途径。     

垂体腺瘤VEGF和bFGF的表达及相关性研究

目的 研究血管内皮生长因子(VEGF)和碱性成纤维细胞生长因子(bFGF)在垂体腺瘤中的表达及其相关性,探讨它们与垂体腺瘤侵袭性生长的关系.方法 垂体腺瘤组织标本55例,其中侵袭性者30例,非侵袭性者25例.运用HE染色方法在光镜下观察垂体腺瘤组织的细胞形态、结构及排列方式,并用免疫组化法检测标本中VEGE和bFGF的表达情况.结果 侵袭性和非侵袭性垂体腺瘤组织的病理特点在HE染色光镜下不易区分;VEGF和bFGF在侵袭性垂体腺瘤中的表达明显高于在非侵袭性垂体腺瘤(P<0.05),在侵袭性垂体腺瘤中两者的表达存在正相关关系(r=0.508,P<0.05).结论 VEGF和bFGF的过度表达与垂体腺瘤的侵袭性生长有密切的关系,两者具有协同作用,可以反映垂体腺瘤的生物学行为.     

垂体腺瘤组织中NF-κB、MMP-9、MICA的表达变化及意义

目的观察垂体腺瘤组织中NF-κB、基质金属蛋白酶9(MMP-9)、MHC-Ⅰ类链分子相关抗原A(MICA)的表达变化,并探讨其意义。方法采用免疫组化法对垂体腺瘤组织和正常脑组织中的NF-κB蛋白、MMP-9蛋白及MICA蛋白进行检测;采用qRT-PCR法对垂体腺瘤组织及正常脑组织中的NF-κB mRNA、MMP-9 mRNA、MICA mRNA进行检测。结果垂体腺瘤与正常脑组织中NF-κB蛋白阳性表达率分别为100%(40/40)、30%(6/20),MMP-9蛋白阳性表达率分别为100%(40/40)、15%(3/20),MICA蛋白阳性表达率分别为100%(40/40)、0;两组比较,P均<0.01。垂体腺瘤与正常脑组织中NF-κB mRNA相对表达量分别为13.045±6.200、2.040±2.067,MMP-9 mRNA相对表达量分别为28.770±7.661、2.369±1.460,MICA mRNA相对表达量分别为231.817±41.046、5.062±3.849;两组比较,P均<0.05。NF-κB蛋白与MICA蛋白、MMP-9蛋白表达均呈正相关(r分别为0.368、0.345,P均<0.05)。结论 NF-κB、MMP-9及MICA在垂体腺瘤组织中高表达,NF-κB可能通过促进MMP-9及MICA表达而促进垂体腺瘤发生、发展。     

survivin在胃肠道间质瘤中的表达及其与COX-2表达的相关性

目的 探讨凋亡抑制蛋白survivin在胃肠道间质瘤(GISTs)组织中的表达情况及其与COX-2表达的相关性.方法 采用免疫组化S-P法检测57例胃肠道间质瘤组织中survivn蛋白和COX-2蛋白的表达情况.结果 57例GISTs中,survivin 38例阳性,阳性率为66.7%;COX-2为47例阳性,阳性率82.5%.survivin的蛋白阳性表达率与GISTs的恶性潜能相关,差异有统计学意义(P<0.01);而COX-2蛋白的阳性表达率与GISTs的恶性潜能无关(P>0.05);survivin表达与COX-2表达呈正相关(P<0.01).结论 survivin在胃肠道间质瘤组织中表达升高,并与GISTs的恶性潜能相关,可成为预测GISTs恶性潜能的指标.survivin与GISTs组织中COX-2的阳性密切相关,两者可能存在共同的激活机制,参与抑制GISTs的细胞凋亡.     

survivin基因在大肠癌组织中的表达及其与bcl-2和p53基因的相关性探讨

目的 探讨survivin在大肠癌组织中的表达及其与bcl-2、p53基因表达的相关性。方法 应用免疫组织化学方法检测大肠腺癌组织中survivin及bcl-2、p53的表达,并与其在正常大肠黏膜、增生性息肉及腺瘤组织中的表达进行比较。结果survivin在正常大肠黏膜无表达,大肠腺瘤（62.5%）、大肠癌（70.9%）中survivin表达率显著高于正常大肠黏膜和增生性息肉（16.7%）（P〈0.01）;survivin表达与与肿瘤浸润深度和淋巴结转移明显相关（P均〈0.05）;大肠癌组织中bcl-2、p53基因与survivin基因表达显著相关（P均〈0.05）。结论 survivin参与了大肠癌的发生和发展,可作为判断预后的参考指标;抑癌基因p53的失活和bcl-2的表达上调与survivin基因的表达可能在大肠癌的发生、发展中起协调作用。     

BMP-4和Ki-67在泌乳素腺瘤中的表达及临床意义

目的探讨骨形态生成蛋白4（BMP-4）和细胞核增殖相关抗原（Ki-67）在泌乳素（PRL）腺瘤中的表达及与腺瘤侵袭性的关系。方法应用免疫组织化学和原位杂交技术检测35例PRL腺瘤及8例正常垂体组织中BMP-4mRNA、BMP-4和Ki-67蛋白的表达水平,并对三者的表达水平的关系进行统计分析。结果8例正常垂体组织的BMP-4和Ki-67表达均阴性;35例PRL腺瘤中,BMP-4mRNA、BMP-4表达水平与PRL腺瘤的侵袭性呈正相关（r=0．885,P〈0．01）;Ki-67在2～3级与0-1级的表达水平有显著性差异（P〈0．05）,但BMP-4mRNA、BMP-4的表达较Ki-67更具灵敏性（P〈0．05）。结论BMP-4在PRL腺瘤中呈特异性高表达,且与PRL腺瘤侵袭性呈正相关。     

Correlation of Bcl-2 and Bax with Apoptosis in Human Pituitary Adenomas

Bcl-2 oncogene and Bax gene play an important role in regulating apoptosis. In the present study, the expression of bcl-2 and bax was investigated and correlated with apoptosis in a series of 81 pituitary adenomas. Bcl-2 and bax proteins were localized by immunohistochemistry and the histoscore (HSC) was assessed by multiplying the immunohistostaining grade (1 to 4) by the staining intensity grade (1 to 3). According to bcl-2/bax HSC the tumors were separated in group A when > or = 1 and group B when < 1. The apoptotic labeling index (ALI) was accessed by the in situ end-labeling (ISEL) technique. Bcl-2 protein was equally detected in functioning and nonfunctioning adenomas with statistically significant higher HSC in nonfunctioning tumors (P < 0.03). Bax protein was immunopositive in the substantial majority of adenomas with significantly higher HSC in functioning as compared to nonfunctioning adenomas (P < 0.0009). The ALI was significantly higher in functioning adenomas as compared to nonfunctioning adenomas (P < 0.04). In addition, ALI was significantly higher in group B than in group A (P < 0.004) and it was correlated with bax HSC (P < 0.004). Finally, the group B of bcl-2/bax significantly predominated in nonfunctioning tumors (P < 0.0009) and in microadenomas (P = 0.05), as compared with functioning adenomas and macroadenomas respectively. In conclusion, our findings suggest that bcl-2 and bax molecules play a role in the regulation of apoptotic mechanisms in pituitary adenomas.     

凋亡抑制基因survivin bcl-2 bax在肺癌中表达的研究

目的检测肺癌患者癌组织和癌旁组织中survivin、bcl-2及bax的基因表达,探讨它们的相关性及与肺癌发生、发展的关系。方法应用TUNEL原位细胞凋亡检测方法及免疫组化方法,对1998—2004年华中科技大学同济医学院附属协和医院收治的163例肺癌患者手术常规石蜡包埋组织中癌基因survivin、bcl-2及bax的表达进行检测,并与其中106例患者的癌旁组织对比,分析免疫组化结果及其与肺癌的病理特征和预后关系。结果在癌旁肺组织中,survivin、bcl-2、bax蛋白阳性表达率分别为1·9%(2例)、29·2%(31例)、93·47%(99例);肺癌组织内,三者阳性表达率分别为69·9%(114例)、62·0%(101例)、52·8%(86例)。异常增高的survivin、bcl-2表达呈明显相关。结论细胞凋亡和增殖失控,相关基因survivin、bcl-2和bax蛋白异常表达在肺癌发生发展中起重要作用。survivin、bcl-2可能在肺癌癌变及浸润过程中起着重要作用,可作为判断肺癌生物学行为和预后的参考指标。     

Expression analysis of cyclins in pituitary adenomas and the normal pituitary gland

OBJECTIVES: The molecular events involved in pituitary tumour development are still poorly understood. The cyclins play an important role in the control of the cell cycle during cell proliferation and over-expression of the cyclins has been shown in many different tumour types. The aim of this study was to investigate whether, in comparison to the normal gland, ectopic expression of cyclins occurs in pituitary tumours, and whether differences in cyclin expression are seen with different pituitary tumour types or in association with different tumour behaviour. In contrast to work on cyclin D there are no published data on cyclin B, A and E in human pituitary tumours. METHODS: Sixty-seven surgically removed pituitary tumours and 10 specimens of normal human anterior gland were studied using immunohistochemistry to detect the nuclear expression of cyclin A, B, D and E. The microvascular density (as a measure of angiogenesis), Ki-67 labelling index (to assess cell proliferation) and bcl-2 expression had previously been investigated in this cohort. RESULTS: All tumours studied contained cells that immunostained positively for cyclin A, B, D and E. However the proportion of positive cells in each tumour type was different. In contrast, there were no cyclin D positive cells in the normal anterior pituitary gland studied, and labelling indices (LI) for cyclins A, B and E were significantly lower in the normal gland than in pituitary adenomas. The cyclin LIs for A, B, D and E were significantly higher in macroadenomas when compared to microadenomas. Non-functioning pituitary tumours (NFA) generally showed the highest cyclin LI. In particular, both recurrent and nonrecurrent NFA showed significantly higher cyclin D LI than other tumours. The ratio of cells expressing cyclin B compared to those expressing cyclin A was significantly higher in functionless tumours that regrew when compared to NFAs that did not (P<0.05). Cyclin D LI and the overall Ki-67 LI as a measure of cell proliferation were related (R2 = 11.4, P = 0.0033) and bcl-2 positive tumours had significantly higher cyclin D LI compared with bcl-2 negative tumours. There was a weak relationship between angiogenesis and the relative proportion of cells expressing D when compared to those in S phase (D/A ratio) (r2 = 10.5, P = 0.02). CONCLUSIONS: We have demonstrated that ectopic expression of cyclin D and over-expression of cyclins A, B and E, regulating different stages of the cell cycle is common in pituitary adenomas. In addition, cyclin expression was related to size and to pituitary tumour regrowth. The differences between functionless tumours that regrow and those that do not, may be due to reduced bcl-2 expression, increased cell proliferation, more cells at the G2/M stage (B/A ratio) and reduced cell differentiation with more aggressive subsequent tumour behaviour. Cyclin D expression and cell proliferation were related indicating that the cells entering the cycle become 'committed' to cell cycle progression. There was no relative over-expression of individual cyclins, and therefore no evidence of relative increase in cell cycle phase, indicating that the increased cyclin expression is more likely to be due to constant mitogenic stimulation rather than cell cycle regulatory failure. Although nuclear cyclin expression is a good marker of tumour growth and aggressive behaviour, the growth signal that leads to cyclin expression remains to be identified.     

大肠肿瘤的基因表达及与细胞凋亡的抑制关系

目的探讨 bcl-2和 P53蛋白在大肠肿瘤中的表达及与细胞凋亡关系。方法用免疫组化方法观察了45例大肠腺瘤和61例大肠癌中 bcl-2和 P53蛋白的表达。结果正常大肠粘膜中 bcl-2和 p53均未见表达,而大肠腺瘤及大肠癌阳性率均较正常明显增加(P<0.01)。大肠腺瘤 p53表达随腺瘤大小增加而增加,其中≥20 mm 组阳性率(77.8%)显著高于<10 mm 组(35.0%,P<0.05)。P53蛋白阳性率也随不典型增生程度增加而增高。p53表达与大肠癌分化程度及 Duke 分期有关。大肠癌细胞凋亡指数与 bcl-2阳性表达呈负相关。大肠腺瘤中 bcl-2和 P53蛋白的表达也呈负相关。结论 bcl-2蛋白表达对大肠癌前病变.腺瘤的增殖有一定意义,p53在大肠腺瘤癌变和大肠癌进展中起重要作用,它们是参与细胞凋亡的良好指标。     

COX-2及survivin在涎腺多形性腺瘤中表达的定量研究

目的　探讨环氧合酶- 2 (COX- 2 )及生存素(survivin)在良、恶性涎腺多形性腺瘤中的表达及其与肿瘤发生发展的关系。方法　采用流式细胞技术检测5 0例良性、17例恶性涎腺多形性腺瘤组织中COX- 2与survivin的表达,并与10例正常腮腺组织进行对比分析。结果　良、恶性涎腺多形性腺瘤及正常腮腺组织COX- 2的阳性表达率分别为76 %、10 0 %、0 ,其荧光指数(FI)分别为1.79±0 .12、3.0 1±0 .4 0、0 .82±0 .0 5。survivin阳性表达率分别为5 6 %、10 0 %、0 ,FI分别为1.0 6±0 .5 9、1.85±0 .16、0 .5 6±0 .0 8。各组间COX- 2与survivin表达量有明显差异(P均<0 .0 1)。在17例恶性涎腺多形性腺瘤中COX- 2与survivin的协同表达率为10 0 %。结论　COX- 2与survivin基因与涎腺多形性腺瘤的发生及恶变关系密切。     

Dynamic expression of apoptosis-related genes during development of laboratory hepatocellular carcinoma and its relation to apoptosis

AIM: To explore the expression of p53, bcl-2, bax, survivin and the cell apoptosis during the development of tree shrew hepatocellular carcinoma (HCC), the relationship between expression of these genes, its impact on HCC development, and its relation to cell apoptosis. METHODS: Tree shrew HCC was induced with aflatoxin B1 (AFB1), and regular biopsy of liver tissues was carried out and the biopsy tissues were collected during cancer inducement. Liver biopsy tissue and HCC tissue were collected from 35 pre-cancerous experimental animals at wk 30 and 60 and at the 30th-, 60th-, and 90th-wk. Liver biopsy tissues were collected from 13 blank control animals at wk 30, 60, and 90. Expression of p53, bcl-2, bax, and survivin at each stage was examined by immunohistochemistry method. Apoptotic cells were detected in situ by the terminal deoxynucleotidyl transferase-mediated nick end labeling (TUNEL) technique. RESULTS: The apoptosis rate of normal hepatic cells was extremely low, whereas it increased during the formation of HCC. Expression of the apoptosis-related genes p53, bd-2, bax, and survivin during the formation of HCC presented an increasing tendency. Expression of p53 did not noticeably relate to that of bcl-2, bax, and survivin, whereas expression of bcl-2 and bax was closely related. In HCC, p53 did not present a distinct relation to cell apoptosis, whereas its high level expression was probably related to liver cell proliferation. Survivin negatively correlated apoptosis index, and its overexpression could inhibit cell apoptosis. CONCLUSION: Apoptosis-related genes p53, bcl-2, bax, and survivin are all related to the occurrence of HCC. The anti-apoptosis effect of bcl-2 is influenced by bax, and ratio bcl/bax reflects more correctly the extent of cell apoptosis.     

Dynamic expression of apoptosis-related genes during development of laboratory hepatocellular carcinoma and its relation to apoptosis

AIM:To explore the expression of p53,bcl-2,bax,survivin and the cell apoptosis during the development of tree shrew hepatocellular carcinoma(HCC),the relationship between expression of these genes,its impact on HCC development,and its relation to cell apoptosis.METHONS:Tree shrew HCC was induced with aflatoxin B1(AFB1),and regular biopsy of liver tissues was carried out and the biopsy tissues were collected during cancer inducement.Liver biopsy tisue and HCC tissue were collected from 35pre-cancerous experimental animats at wk 30 and 60 and at the 30th_,60th_,and 90th-wk,Liver biopsy tissues were collected from 13 blank control animals at wk 30,60,and 90.Expression of p53,bcl-2,bax,and survivin at each stage was examined by immunohistochemistry method.Apoptotic cells were detected in situ by the terminal deoxynucleotidyl transferase-mediated nick end labeling(tunel)technique.RESULTS:The apoptosis rate of normal hepatic cells was extremely low,whereas it increased during the formation of HCC.Expression of the apoptosis-related genes p53,bd-2,bax,and suvivin during the formation of HCC presented an increasing tendency.Expression of p53 did not noticeably relate to that of bcl-2,bax,and survivin,whereas expression of bcl-2 and bax was closely related.In HCC,p53 did not present a distinct relation to cell apoptosis,whereas its high level expression was probably related to liver cell proliferation.Survivin negetively correlated apoptosis index,and its overexpression could inhibit cell apoptosis.CONCLUSION:Apoptosis-related genes p53,bcl-2,bax,and survivin are all related to the occurrence of HCC.The anti-apoptosis effect of bcl-2 is influenced by bax,and ratio bcl/bax reflects more correctly the extent of cell apoptosis.     

Somatostatin receptor subtypes mRNA in TSH-secreting pituitary adenomas: a case showing a dramatic reduction in tumor size during short octreotide treatment

TSH-secreting adenoma is a rare pituitary adenoma, and the expression levels of the specific subtypes of somatostatin receptors (sstr) mRNAs have remained obscure. To determine the quantitative expression of the sstr1-5 mRNAs in TSH-secreting adenomas that may be related to the efficacy of treatment with a somatostatin analogue, expression of the sstr1-5 mRNAs was examined and compared in TSH-secreting adenomas and other pituitary adenomas. The pituitary adenomas were obtained at transsphenoidal surgery from 4 cases of TSH-secreting adenoma, including 1 patient showing a significant shrinkage of the tumor size after only 10 days of octreotide treatment, 2 patients without tumor size reduction and 1 patient without treatment, and 5 GH-secreting adenomas, 6 prolactinomas, 5 nonfunctioning adenomas, 4 ACTH-secreting adenomas and normal pituitaries at autopsy from 4 normal subjects. In comparison to the normal pituitary, sstr2A>sstr1>sstr5>sstr3 mRNAs were expressed in the TSH-secreting adenomas examined. No expression of sstr2B or sstr4 mRNA was observed. The expression level of sstr2 mRNA was significantly higher than those in normal pituitary, prolactinomas, ACTH-secreting and nonfunctioning pituitary adenomas. The patient with marked shrinkage of the tumor showed the highest expression of both sstr2 and sstr5 mRNAs among all the cases of pituitary adenoma. A TSH-secreting tumor without shrinkage showed a similar expression level of sstr2 mRNA. These findings demonstrated that TSH-secreting adenomas express sstr1, 2A, 3 and 5 mRNAs, predominantly sstr2A, and in addition to the expression of sstr2 mRNA, the expression level of sstr5 mRNA may be a factor affecting the tumor shrinkage by somatostatin analogues against TSH-secreting adenomas.     

p53 and bcl-2 protein expression in rectosigmoid adenomas

Objective: The aim of this study was to evaluate whether p53 or bcl-2 protein expression in rectosigmoid adenomas is associated with histological characteristics of the adenomas and with presence of synchronous advanced proximal neoplasms.
Methods: Seventy-six average-risk patients who underwent total colonoscopy and had rectosigmoid adenoma(s) were studied. An adenoma was considered advanced if villous histology and/or severe dysplasia and/or diameter >1 cm were present. p53 And bcl-2 protein expression was immunohistochemically examined using specific monoclonal antibodies.
Results: p53 Protein was detected in 43% and bcl-2 in 93% of the 76 rectosigmoid adenomas. Advanced compared with nonadvanced adenomas were significantly more frequently p53-positive (28 of 44 or 63.6% vs five of 32 or 15.6%,   p < 10⁻⁴  ) or had a bcl-2 score of 12 (20 of 44 or 45.5% vs five of 32 or 15.6%,   p = 0.007  ). Proximal advanced neoplasms were mainly found in patients with rectosigmoid adenomas positive for p53 and with a bcl-2 score of 12 (six of 17 or 35.3% vs 2/59 or 3.4%, OR: 15.6,   p = 0.001  ) and in particular in those with advanced rectosigmoid adenomas positive for p53 and with a bcl-2 score of 12 (six of 13 or 46.2% vs two of 31 or 6.5%, OR: 12.4,   p = 0.007  ).
Conclusion: p53 Expression and bcl-2 protein overexpression in rectosigmoid adenomas are associated with advanced histology and a high risk of synchronous advanced proximal colon neoplasm.