宫颈鳞状上皮病变组织中乳头状瘤病毒和Ki-67及p16^INK4a蛋白表达意义的研究

目的：探讨Ki-67、p16^INK4a和人乳头状瘤病毒（HPV）在不同程度宫颈鳞状上皮病变组织中的表达及临床病理意义。方法：采用原位分子杂交及免疫组化方法,检测HPV的不同亚型、Ki-67、p16^INK4a蛋白在182例不同程度宫颈病变组织中的表达。结果：HPV在不同程度病变中总检出率52.19%（95/182）;在宫颈高级别上皮内瘤变及鳞癌组中检出最多的感染类型为HPV16/18,而HPV6/11在尖锐湿疣组检出率87.50%（21/24）最高;随着宫颈病变严重程度的增加,级别升高,Ki-67、p16^INK4a阳性程度呈递增趋势。Ki-67、p16^INK4a与HPV16/18型感染关系密切,χ^2=11.779 8,P〈0.01;Ki-67也与HPV6/11型有关。结论：HPV16/18型及Ki-67、p16^INK4a在宫颈高级别上皮内瘤变及鳞癌中表达明显升高,可能对宫颈鳞癌的发生、发展具有协同作用。     

p16INK4a/Ki67免疫细胞化学双染在检出宫颈癌及癌前病变中的作用

目的: 探讨p16INK4a/Ki67免疫细胞化学双染在检出宫颈癌及癌前病变中的作用。方法 : 选择妇科门诊就诊妇女131名,平均年龄（39±10.73）岁,进行p16INK4a/Ki67免疫细胞化学双染检测、宫颈细胞学检查和高危型HPV检测。p16INK4a/Ki67双染采用CINtec PLUS细胞学试剂盒方法,宫颈细胞学应用Thinprep或surepath液基薄片的方法,高危型HPV检测采用Cobas 4800检测系统。结果: p16INK4a/Ki67免疫细胞化学双染检出CIN2及以上病变的灵敏度为92.8%,特异度为58.8%,AUC为0.773,高于细胞学检查（82.5%,44.1%,0.633）;其特异度及AUC也明显高于高危型HPV检测（17.6%,0.562）,差异有统计学意义（P＜0.05）。p16INK4a/Ki67免疫细胞化学双染联合细胞学检查漏诊率最低。结论: p16INK4a/Ki67双染检测具有更高的灵敏性及特异性,降低了宫颈高级别鳞状上皮病变的漏诊率及过度诊断,有助于提高宫颈癌的检出率。     

P16INK4a及Ki-67免疫细胞化学检测对ASC-US中高级别病变检出的意义

目的：探讨液基细胞学剩余细胞标本P16INK4a、Ki-67免疫细胞化学染色检测宫颈癌前病变的价值。方法：选取2010年1月至2012年6月因宫颈疾病于北京大学第三医院妇产科就诊患者液基细胞学剩余标本50例。所有患者行高危型HPVDNA杂交捕获II代（HCII）检测,P16INK4a、Ki-67免疫细胞化学检测,同时行阴道镜检查及组织病理学活检。结果：以病理诊断将患者分为CIN2以下组和CIN2及以上组。CIN2及以上组P16INK4a及Ki-67表达量高于CIN2以下组,差异均具有统计学意义（P〈0．05）;P16INK4a或Ki-67检测对高级别病变预测的准确性在ASC—US组中优于异常细胞学组;在ASC—US中,P16INK4a或Ki-67检测对高级别病变预测的准确性优于高危型HPV检测。结论：宫颈脱落细胞中P16INK4a或Ki-67免疫细胞化学检测相比于高危型HPV检测可以提高对ASC—US中高级别病变的检出作用。     

p16INK4a和Ki67在胃癌及癌前病变中的表达和意义

目的:探讨p16INK4a、Ki67在慢性胃炎、胃上皮内瘤变、胃癌及癌旁非肿瘤性胃黏膜中的表达和临床意义。方法:采用免疫组织化学SP法检测23例慢性胃炎、16例胃低级别上皮内瘤变、16例胃高级别上皮内瘤变、45例胃癌及癌旁非肿瘤性胃黏膜组织样本中p16INK4a、Ki67的表达。结果:p16INK4a在慢性胃炎、低级别上皮内瘤变、高级别上皮内瘤变和胃癌细胞中均呈核浆型表达,阳性表达率分别为4.34%、25.00%、62.50%、66.67%,在癌旁非肿瘤性胃黏膜腺体上皮细胞中呈阴性表达;Ki67在慢性胃炎、低级别上皮内瘤变、高级别上皮内瘤变和胃癌组织细胞中呈核型表达,Ki67指数分别为17.39%、37.50%、56.25%和77.78%。结论:p16INK4a代偿性高表达是胃癌和胃癌前病变的重要免疫表型特征,联合检测p16INK4a和Ki67表达可作为胃癌诊断的分子靶标和可靠方法。     

p16~(INK4A)和HPV16 E7/HPV18 E6在ASCUS中的表达及临床意义

目的:探讨p16 INK4A和HPV16 E7/HPV18 E6在宫颈细胞学诊断为非典型性鳞状细胞不明确意义型(ASCUS)中的表达及筛查潜在宫颈病变的价值。方法:对150例ASCUS患者行阴道镜检查并取活检,同时对该150例患者的TCT标本进行免疫细胞化学染色检测p16INK4A的表达和RT-PCR法检测其中HPV16型E7蛋白和18型E6蛋白(HPV16 E7/HPV18 E6)mRNA的表达。结果:p16INK4A和HPV16 E7/HPV18 E6 mRNA在ASCUS中表达的阳性率分别为37.33%和46.67%,随着病理级别的增加,p16INK4A和HPV16E7/HPV18 E6 mRNA表达的阳性率也随之增加;p16INK4A和HPV16 E7/HPV18 E6 mRNA筛查ASCUS中宫颈病变的灵敏度、特异度、阳性预测值和阴性预测值分别为0.88、0.95、0.91、0.93和0.81、0.75、0.67、0.86,在p16INK4A和HPV16 E7/HPV18 E6 mRNA阳性的样本中,宫颈病变发生率分别为91.07%和67.14%,均明显高于阴性样本中的发病率7.45%和13.75%(P<0.001);ASCUS中宫颈病变样本中p16INK4A和HPV16 E7/HPV18 E6 mRNA呈高表达,且具有较高的一致性(κ=0.6475)。结论:p16INK4A和HPV16 E7/HPV18 E6 mRNA在ASCUS中病理诊断为宫颈病变的样本中均呈高表达,对筛查潜在的宫颈病变具有重要意义,其中p16INK4A的筛查效能优于HPV16E7/HPV18E6mRNA;p16INK4A能间接反映HPV的转录活性,在ASCUS的分流中有重要意义,且可视性的p16INK4A免疫染色比HPV检测更直观。     

宫颈上皮内瘤样病变发生发展与p16/Ki-67共表达的相关性研究进展

宫颈上皮内瘤样病变（cervical intraepithelial neoplasia,CIN）属于宫颈癌前病变,虽然CIN进展成宫颈癌时间一般较长,但其发病率增多及发病年龄变小,对女性身心健康造成严重影响。随着宫颈癌筛查技术的进步和分子生物学技术的发展,高级别的宫颈癌上皮内瘤样变的早期检查确认并进行阻断已成为筛查的目标。p16被认为是发现最早的抑癌基因,在鉴别低级别与高级别宫颈鳞状上皮内病变中有重要作用。Ki-67为常见肿瘤标志物,在多种肿瘤中表达。p16/Ki-67双染为新型宫颈病变筛查或诊断方法,即同一细胞内检测到p16、Ki-67共表达,则提示细胞周期失调,考虑为宫颈上皮内高级别瘤样病变。国内近年有研究报道p16和Ki-67在CIN中的作用,未见到相关的综述报道。本文对宫颈上皮内瘤样病变与p16/Ki-67共表达的相关性作一综述,为临床宫颈病变鉴别、诊断提供参考。     

人乳头瘤病毒E6/E7 mRNA及p16/Ki-67蛋白共表达在不同级别宫颈病变中的临床意义

目的：探讨人乳头瘤病毒E6/E7 mRNA及p16/Ki-67蛋白在不同级别宫颈病变中的表达情况。方法：收集在郑州大学第二附属医院妇科门诊就诊的妇女537例，采用APTIMA HPV实验和CINtec PLUS技术分别检测E6/E7 mRNA及p16/Ki-67蛋白，所有妇女均行阴道镜活检和病理学检查。结果：537例妇女的平均年龄为43.88±10.97岁。HPV mRNA和p16/Ki-67阳性率均随着病理诊断级别的升高而增加(P<0.001), HPV mRNA和 p16/Ki-67在病理正常人群中的阳性率分别为19.1%和13.1%，在宫颈鳞癌(SCC)中的阳性率分别为100.0%和97.7%。与在不同病理级别中的阳性率趋势基本一致，HPV mRNA与p16/Ki-67的阳性率也随着细胞学结果的严重程度增加而升高(P<0.001)。HPV mRNA 和p16/Ki-67在细胞学正常人群中的阳性率分别为18.6%和14.2%，在SCC中的阳性率分别为100.0%和93.5%。结论：HPV mRNA与p16/Ki-67蛋白共表达与宫颈病变程度呈正相关，可以通过监测患者HPV mRNA和p16/Ki-67表达水平有效评估宫颈病变状况。     

P14ARF、P16INK4a基因表达与高危型HPV感染的关系

目的探讨P14ARF、P16INK4a的基因表达与高危型人乳头瘤病毒DNA（HPVDNA）感染的关系。方法采用免疫组化EnVision法,对130例宫颈鳞癌、宫颈上皮内瘤变60例、20例正常宫颈组织进行P14ARF、P16INK4a蛋白基因检测,并采用原位杂交法检测130例宫颈鳞癌、宫颈上皮内瘤变60例、20例正常宫颈组织中的HPVDNA。结果宫颈鳞癌组中P14ARF、P16INK4a蛋白表达率分别为100．0％（130／130）和96．9％（126／130）;在60例宫颈上皮内瘤变组中其表达率分别为85．0％（51／60）、81．7％（49／60）;在20例正常宫颈组中其表达率分别为10．0％（2／20）、15．0％（3／20）,宫颈鳞癌组显著高于正常对照组（P〈0．01）;正常宫颈组与宫颈上皮内瘤变及宫颈鳞癌组P16INK4A和P14ARF的表达呈显著差异（P〈0．05）。HPV16／18在130例宫颈鳞癌中86例（66．2％）表达阳性;在宫颈上皮内瘤变中39例（65．0％）表达阳性;P14ARF、P16INK4a阳性率HPVI）NA阳性宫颈鳞癌、宫颈上皮内瘤变组与HPVDNA阴性宫颈鳞癌、宫颈上皮内瘤变组比较无显著差异（P〉0．05）。结论P14ARF、P16INK4a蛋白在宫颈上皮内瘤变及宫颈鳞癌组织中呈高表达,有较高的特异性和敏感性,可作为宫颈癌前病变及宫颈癌的诊断指标,     

子宫颈鳞状细胞癌中人乳头瘤病毒感染与Rb相关基因蛋白的表达及其意义

 目的　探讨子宫颈浸润性鳞状细胞癌（ISCC）中高危型人乳头瘤病毒（HPV）16／18、31／33感染与Rb相关基因蛋白p16ink4a、CyclinD1、CDK4、Rb、E2F-1和Ki-67的表达情况并分析HPV及Rb相关蛋白与ISCC临床病理参数的相关性。方法　收集73例ISCC、30例高级别鳞状上皮内病变（HSIL）、32例低级别鳞状上皮内病变（LSIL）和21例正常子宫颈鳞状上皮（NCE）。采用原位杂交法检测HPV16／18、31／33DNA的表达;免疫组织化学二步法检测上述蛋白的表达。统计分析HPV、上述蛋白及临床病理参数的关系。结果　HPV16／18、31／33在四组总体间表达差异有统计学意义（P＜0.01）,HPV16／18阳性表达与脉管内瘤栓正相关（OR＝3.875）,HPV31／33阳性表达与临床分期正相关（OR＝3.5）;p16ink4a、CyclinD1、CDK4、Rb、E2F-1和Ki-67在四组总体间差异有统计学意义（P＜0.01）。Rb与Ki-67正相关（rs=0.250）;p16ink4a阳性表达与组织分级负相关（OR＝0.942）;CDK4阳性表达与组织分级正相关（OR＝1.033）;年龄与临床分期正相关（OR＝1.063）。结论　HPV16／18、31／33感染与ISCC的发生、发展密切相关;CDK4、Ki-67可作为子宫颈病变程度的客观参考指标;Rb在ISCC中的详细作用机制还需进一步探讨。     

高危型HPV负荷量和p16INK4A蛋白监测评估宫颈锥切术治疗CIN

[目的]评价高危型人乳头状瘤病毒HPV负荷量的检测和p16INK4A蛋白的表达在预测宫颈上皮内瘤变(CIN)宫颈锥切术后残存病变或复发中的意义.[方法]回顾性分析142例2008年10月至2010年12月因CIN行宫颈锥形切除术治疗患者的临床资料.所有患者均于宫颈锥形切除术前6个月以内和术后6～12个月进行HPV负荷量检测,并采用免疫组化方法检测HPV DNA阳性患者宫颈细胞中p16INK4A蛋白表达.[结果]宫颈锥切术前,随着CIN级别的上升,HPV负荷量以及p16INK4A蛋白表达均明显增强(P＜0.05).但在宫颈锥切术后,HPV负荷量和p16INK4A蛋白表达明显降低,宫颈锥切术前和术后两者之间差异有统计学意义(P＜0.05).[结论] HPV负荷量持续增高和p16INK4A蛋白持续呈强阳性是宫颈锥切术后发生残存病变或复发的高危因素,在监测HPV负荷量的同时检测p16INK4A蛋白的表达,对判断宫颈锥切术后发生残存病变或复发有重要意义.     

The Association of Molecular Biomarkers in the Diagnosis of Cervical Pre-Cancer and Cancer and Risk Factors in Senegalese

Background: Cervical intraepithelial neoplasia (CIN) grading is subjective and affected by substantial rates of discordance among pathologists. Although recent studies have suggested that p16INK4a may be a useful surrogate biomarker of cervical neoplasia, Ki-67 and human papillomavirus testing have also been shown to be useful in detecting neoplasia. The purpose of this study was to determine the expression of p16INK4a and Ki-67 in cervical neoplasia and its correlations with cofactors. Methods: The study involved 69 patients with and without cervical neoplasia who underwent colposcopic directed biopsy. On each patient, two samples were taken; the first was used for immunohistochemistry and the second for molecular testing, using HPV16and18 genotyping Real-Time PCR Kit. Results: The study revealed the expression level of p16INK4a and Ki-67 in a descending order, from invasive squamous cell carcinoma (SCC), CIN2/3, CIN1 and non-dysplastic lesions. Correlations showed an association between the staining of p16NK4a and Ki-67 with the increase of age (OR: 1.79 (95%IC: 0.49 – 6.55), p = 0.037) and marital status (OR: 0.17 (95%IC: 0.04 – 0.68), p = 0.003). We found that the expressions of p16INK4a and Ki-67 were significantly different between invasive SCC vs non-dysplasia (OR: 44.57 (95%IC: 4.91 – 403.91), p <0.0001). The study showed significant correlation between HPV 16and18 infection with p16 INK4a and Ki-67 expression (OR: 0.13 (95%IC: 0.03 – 0.52), p <0.0001). Strong expression of p16INK4a and Ki-67 were observed in invasive squamous cell carcinoma, moderate staining was found in CIN2/3, weak staining in CIN1 and normal histology. Conclusion: Our findings indicate that p16INK4a and Ki-67 expressions associated strongly with cervical pathology. Therefore, p16/Ki-67 could be considered as a suitable biomarker for cervical cancer screening, particularly in HPV-based screening programs.     

Expression of the p16INK4a and Ki-67 in relation to the grade of cervical intraepithelial neoplasia and high-risk human papillomavirus infection

Objective

The purposes of this study were to evaluate the expression of p16^INK4a (referred as to p16) and Ki-67 in cervical intraepithelial neoplasia (CIN), and the correlation between high-risk human papillomavirus (HPV) infection and the above biomarkers.

Methods

We analyzed 31 patients who were diagnosed with CIN at Kwandong University Myongji Hospital from October 2006 to September 2007. CIN specimens (CIN1, 12; CIN2, 6; CIN3, 13) were obtained by colposcopy-directed biopsy (CDB) or loop electrical excision procedure (LEEP). The expressions of p16 and Ki-67 were evaluated by immunohistochemical methods with antibodies to p16 and Ki67. The immunohistochemical staining results were classified into four grades: 0, 1, 2 and 3. HPV genotyping or Hybrid Capture-II test was used to detect high-risk HPV.

Results

The expression of p16 (p<0.001) and Ki-67 (p=0.003) were positively associated with CIN grade. p16 expressions increased significantly with high-risk HPV infection (p=0.014), especially HPV type 16 and 58. Ki-67 expression was not related with high-risk HPV. There was positive correlation between the expression of the p16 and Ki-67 (p=0.007).

Conclusion

CIN grade were positively related to the expression of p16 and Ki-67. p16 expressions of high-risk HPV specimens significantly increased more than Ki-67. Therefore, in the diagnosis of CIN and high-risk HPV infection, p16 can be a useful biomarker.     

细胞周期调控基因与人类乳头状瘤病毒在子宫颈癌中的表达

目的分析细胞周期调控基因p16^INK4A、细胞周期蛋白D1（Cyclin D1）及Ki-67蛋白与人乳头状瘤病毒（HPV）16／18、31／33在子宫颈鳞状细胞癌（ISCC）中的表达,研究其在ISCC发生、发展中的作用和相关性。方法应用组织芯片结合原位杂交法和免疫组织化学法检测66例ISCC、35例子宫颈上皮内瘤变（CIN）、30例正常子宫颈鳞状上皮（NCE）中p16^INK4A、Cyclin D1、Ki-67和HPV16／18、31／33的表达。应用SPSS13．0统计软件分析结果。结果HPV16／18、p16^INK4A、Cyclin D1及Ki-67在ISCC中的表达明显高于CIN和NCE组,差异有统计学意义;p16^INK4A蛋白阳性表达率与组织学分级呈正相关;Ki-67阳性表达率与淋巴结转移和子宫颈管壁浸润深度呈正相关;Cyclin D1蛋白与临床各参数均无相关性（P〉0．05）。结论高危HPV在ISCC的发生、发展中起重要作用,p16^INK4A基因可能不是单纯作为抑癌基因在子宫颈癌中起作用,Ki-67可以作为鉴别良、恶性肿瘤的有价值的临床参考指标。     

The role of cyclins and cyclins inhibitors in the multistep process of HPV-associated cervical carcinoma

BACKGROUND: Human papillomavirus (HPV) types 16 and 18 are associated with cervical carcinogenesis. This is possibly achieved through an interaction between HPV oncogenic proteins and some cell cycle regulatory genes. However, the exact pathogenetic mechanisms are not well defined yet. METHODS: We investigated 110 subjects (43 invasive squamous cell carcinoma (ISCC), 38 CIN III, 11 CIN II, 18 CIN I) confirmed to be positive for HPV16 and/or 18 as well as 20 normal cervical tissue (NCT) samples for abnormal expression of cyclin D1, cyclin E, CDK4, cyclin inhibitors (p21 (waf), p27, p16 (INK4A)) and Ki-67 using immunohistochemistry and differential PCR techniques. RESULTS: There was a significant increase in the expression of Ki-67, cyclin E, CDK4, p16 (INK4A) (p=0.003, 0.001, 0.001) and a significant decrease in p27 (Kip1) from NCT to ISCC (p=0.003). There was a significant correlation between altered expression of p27 (KIP1) and p16(INK4A) (p<0.001), cyclin D1 and CDK4 (p=0.001), cyclin E and p27 (Kip1) (p=0.011) in all studied groups. In ISCC, there was significant relationship between standard clinicopathological prognostic factors and high Ki-67 index , increased cyclin D1 and cyclin E, reduced p27 (Kip1) and p21 (waf). CONCLUSION: 1) Aberrations involving p27 (KIP1), cyclin E, CDK4 and p16 (INK4A) are considered early events in HPV 16 and 18-associated cervical carcinogenesis (CINI & II), whereas cyclin D1 aberrations are late events (CINIII & ISCC) 2) Immunohistochemical tests for p16 (INK4A) and cyclin E could help in early diagnosis of cervical carcinoma 3) Only FIGO stage, cyclin D1, p27 (Kip1) and Ki-67 are independent prognostic factors that might help in predicting outcome of cervical cancer patients.     

Human papillomavirus,p16INK4A,and Ki-67 in relation to clinicopathological variables and survival in primary carcinoma of the vagina

Background:

This study aimed to determine human papillomavirus (HPV) status and to investigate p16^INK4A and Ki-67 expression and their correlation with clinical parameters and survival in women with primary carcinoma of the vagina (PCV).

Methods:

The presence of HPV DNA was evaluated by PCR. Genotyping was performed by Luminex in 68 short-term (⩽2 years) and long-term (⩾8 years) PCV survivors. p16^INK4A and Ki-67 expression was evaluated by immunohistochemistry.

Results:

Human papillomavirus DNA was detected in 43% of patients, the majority (63%) of whom were HPV16 positive. High p16^INK4A expression was significantly correlated with low histopathological grade (P=0.004), HPV positivity (P=0.032), and long-term survival (P=0.045). High Ki-67 expression was negatively correlated with histopathological grade (P<0.001) and tumour size (P=0.047). There was an association between HPV positivity and low histopathological grade, but not between HPV positivity and survival.

Conclusion:

High p16^INK4A expression was associated with long-term survival, but the only independent predictors for survival were tumour size and histopathological grade. Our results indicate that p16^INK4A and Ki-67 expression might be useful in tumour grading, and that it might be possible to use p16^INK4A expression as a marker for HPV positivity, but this has to be further elucidated.     

Methylation Status of P16Ink4a in Human Papillomavirus-Associated Cancer of Oral Cavity and Oropharynx in Northeastern Thailand

Background: Over-expression of p16INK4a protein is a biomarker for human papillomavirus (HPV)-associated cervical cancer. However, absence of p16INK4a protein expression in HPV-associated cancer of the oral cavity and oropharynx has been reported. Among a number of possible reasons for this is methylation, which is frequently noted in the promoter region of p16INK4a and is associated with silencing of the gene and disease severity. Methods: We investigated the relationships between p16INK4a protein expression, HPV infection and methylation status of the p16INK4a promoter in cancers of the oral cavity and oropharynx. Fifty-three formalin-fixed paraffin-embedded (FFPE) cancer tissue samples from the oral cavity (49 cases) and oropharynx (4 cases) were studied. P16INK4a protein expression was determined using immunohistochemical staining (IHC). Additional oral tissues lacking squamous intraepithelial lesions (SILs), and cervical tissues with high-level SILs, were used as negative and positive controls, respectively. High-risk HPV infection was detected using HPV E6/E7 mRNA in situ hybridization. Methylation status of the p16INK4a promoter was investigated using sodium bisulfite treatment and methylation-specific PCR (MS-PCR).Results: HPV infection was found in 40.8% (20/49) and 50.0% (2/4) of oral cavity and oropharynx cancers, respectively. Promoter methylation of p16INK4a occurred in 73.6 % of all cases and differed significantly in frequency between HPV-positive (90.9%, 20/22) and HPV-negative (61.3%, 19/31) samples. Expression of p16INK4a was found in 35.8% (19/53) and commonly detected in samples with p16INK4a unmethylation (79.5%). Interestingly, the silencing of p16INK4a (64.2%, 34/53) was significantly associated with methylation status (91.2%, 31/34), especially in HPV-infected samples in which the p16INK4a promoter was methylated (52.9%, 18/34). Conclusions: This result demonstrated high frequency of p16INK4a promoter methylation status in HPV-associated HNSCC subsets that could influence the silent p16INK4a expression and might promote disease severity.     

Evaluation of cervical cone biopsies for coexpression of p16INK4a and Ki-67 in epithelial cells

Diffuse overexpression of p16(INK4a) in basal and parabasal cells of cervical epithelium is a hallmark of human papillomavirus-mediated transformation. Focal p16(INK4a) expression is occasionally observed in nondysplastic epithelium. In normal cells, expression of p16(INK4a) triggers cell cycle arrest. However, cells undergoing transformation in intraepithelial lesions actively proliferate. To prove that the different expression patterns of p16(INK4a) , i.e., focal versus diffuse, reflect biologically different entities, we hypothesized that p16(INK4a) -positive cells in epithelia displaying focal p16(INK4a) expression pattern do not coexpress proliferation-associated Ki-67 protein, while p16(INK4a) -positive cells in lesions with diffuse p16(INK4a) expression may do. A total of 138 cervical cone biopsies were stained for the expression of p16(INK4a) and Ki-67 using a primary antibody cocktail. All metaplastic lesions (n = 21) displayed focal staining for p16(INK4a) , and in all of these lesions p16(INK4a) -positive cells were found to be negative for Ki-67 expression. Diffuse expression of p16(INK4a) was observed in 12/21 (57.1%) cervical intraepithelial neoplasia (CIN) 1 lesions, all of them simultaneously showed Ki-67 immunoreactivity in a large proportion of p16(INK4a) -positive cells. Seventeen of 23 (73.9%) CIN2 lesions and all 27 (100%) CIN3/carcinoma in situ (CIS) as well as all 46 (100%) carcinoma cases displayed diffuse and combined expression of p16(INK4a) and Ki-67. Coexpression of Ki-67 and p16(INK4a) in the same cell is entirely restricted to cervical lesions displaying diffuse p16(INK4a) expression, whereas in lesions with focal p16(INK4a) expression, p16(INK4a) -expressing cells are negative for Ki-67. Thus, diffuse expression of p16(INK4a) reflects lesions with proliferation-competent cells, while p16(INK4a) -expressing cells associated with focal expression patterns are cell cycle arrested.     

p16、Ki-67在宫颈鳞状上皮病变分级诊断中的意义

目的:探讨p16、Ki-67联合应用在宫颈鳞状上皮病变分级诊断中的意义.方法:采用免疫组化方法检测117例宫颈各类病变活检组织中p16、Ki-67蛋白表达情况,并对该组患者液基薄层细胞学(TCT)、高危型人乳头瘤病毒基因检测(HPV-DNA)结果进行比较.结果:根据HE组织学形态,结合免疫组化染色结果修订原有诊断,其中LSIL、HSIL的构成比差异有统计学意义.p16在LSIL、HSIL中的阳性表达率分别为0.00%、97.30%,Ki-67则分别为21.57%、67.58%(P<0.05).TCT和HPV-DNA检测HSIL的敏感度89.19%,特异度39.61%.联合应用p16、Ki-67的敏感度46.67%,特异度95.74%.结论:联合免疫组化染色检测p16、Ki-67可作为宫颈鳞状上皮病变分级诊断的重要标记物.联合TCT、HPV-DNA在宫颈癌筛查中有较高的敏感度,但特异度有限,需与p16、Ki-67免疫组化染色相结合.     

Expression of p16(INK4a) in relation to histopathology and viral load of 'high-risk' HPV types in cervical neoplastic lesions

A total of 91 cervical archival biopsy series were analysed for the presence and viral load of 'high-risk' types of human papillomavirus (HR-HPV), and p16(INK4a) expression. The women had various degrees of CIN (cervical intraepithelial neoplasia). HPV 16 was the most prevalent type found, at 47% frequency. The frequency of HPV 16 increased with increasing immunoreactivity to p16(INK4a), from 39% to 44% at cases scored low to medium, to 65% at high reactivity. Thirty (33%) of the samples had negative p16(INK4a) analysis results, but were positive for HR-HPV. There was no significant correlation between viral load and the level of p16(INK4a) expression, while the grade of CIN correlated to such expressions. Thus, p16(INK4a) expression analysis yielded information which is consistent with results from the histopathology and might complement the HPV analysis in a clinical prognostic procedure in order to find women at risk for cervical cancer.