The expression of P16,Ki-67 in cervical squamous epithelial lesions and the significance of their detection combined with HPV / 国际检验医学杂志

Objective To study the expression of P16 ,Ki‐67 in cervical squamous epithelial lesions and the significance of their detection combined with human papillomavirus(HPV) .Methods 188 cases of cervical tissues from surgical excision were collected , including 48 cases of cervical cancer ,100 cases of cervical intraepithelial neoplasia(CIN) ,and 40 cases of chronic cervicitis ,which were set as cervical cancer group ,CIN group and cervicitis group ,respectively .Expression of P16 ,Ki‐67 in cervical tissue were de‐tected by using immunohistochemistry ,and the HPV infection were detected by using PCR technology .Results The positive ex‐pression rates of P16 and Ki‐67 in cervical cancer ,CIN group was significantly higher than those in cervicitis group(P0 .05) .With the increase of CIN level ,the positive expression rates of P16 and Ki‐67 increased ,among the three CIN groups there were significant difference(P<0 .05) .In cervical cancer group and CINⅢ group ,the expression rates of P16 and Ki‐67 were both significantly high‐er than the other 3 groups(P<0 .05) .In CINⅠ - Ⅲ groups ,the over expression rates of P16 and Ki‐67 were statistically different (P<0 .05) .The expression of P16 positively correlated with the positive rates of HPV infection (rs =0 .706 ,P=0 .011);the ex‐pression of Ki‐67 positively correlated with the positive rates of HPV infection(rs=0 .695 ,P=0 .021) .Conclusion CIN and cervi‐cal cancer of early stage could be diagnosed and the pathological progress of CIN could be predicted by using the combined detection of P16 ,Ki‐67 and HPV .

Influence of TGSJ formulae-medicated serum on proliferation of breast cancer MCF-7 cells and its mechanism / 肿瘤

Objective: To investigate the effect of medicated serum containing Chinese medicinal formulae Tiaogan Sanjie (TGSJ) on proliferation of breast cancer MCF-7 cells in vitro , and to explore its possible mechanism. Methods: The medicated serum was prepared by using healthy male SD rats receiving TGSJ. The MCF-7 cells were divided into 3 groups: blank control group (cultured with normal nutrient fluid), negative control group (cultured with serum without medication) and TGSJ group (cultured with the medicated serum). After culture for 72 h, the cell viability was determined by MTT method, the expression level of p16 mRNA was detected by using semiquantitative RT-PCR, and the DNA methylation level of p 16 gene was detected by fluorescent quantitative MethyLight-PCR. Results: After culture with the medicated serum for 72 h, the proliferation rate of MCF-7 cells was obviously declined, the mRNA expression level of p 16 gene was obviously increased, and the methylation level of p 16 gene was obviously declined, as compared with those of the blank control group and the negative control group (both P < 0.05). Conclusion: TGSJ can inhibit the proliferation of breast cancer cells, and this effect may be related to reversing the methylation of p 16 gene and up-regulating the expression level of p16 mRNA.

Expression of human papillomavirus L1 capsid protein and tumor suppressor gene p16INK4A and their relevance in cervical lesions / 肿瘤研究与临床

Objective To observe the expression and relevance of human papillomavirus L1 (HPVL1)capsid protein and tumor suppressor gene p16~4A in cervical lesions.Methods The expression of HPVL1 capsid protein and p16INK4A in liquid-based cytology specimens and organization from 210 cases infected with HPV virus were detected by Max-vision immunohistochemistry method.Results In different grade of liquidbased cytology specimens,the positive rates of HPVL1 capsid protein had statistic difference (x 2 =70.50,P ＜ 0.005).The rate in LSIL couples was 68 ％ (34/50),which was the highest in all couples.The positive rates of tumor suppressor gene p16INK4A were increased gradually.In SCC couples,the positive rates was 100 ％(30/30),which was the hishest.In LISL couples,the rate of HPVL1+ p16INK4A-was 32 ％ (16/50),which was the hishest.In SCC couples,the rate of HPVL1-p16INK4A+ was 100 ％ (30/30),which was the highest.In orgnizational specimens,the positive rates of HPVL1 capsid protein in cervical intraepithelial neoplasia had statistic difference (x2 =54.37,P ＜ 0.005).The rate in CIN Ⅰ group was 60.4 ％ (32/53),which was the highest.The positive rates of tumor suppressor gene p16 were increased gradually.In cervical cancer group,the positive rate was 100 ％ (28/28),which was the highest.In CIN Ⅰ group,the rate of HPVL1+ p16INK4A-was 45.3 ％ (24/53),which was the highest.In cervical cancer couples,the rate of HPVL1 (-) p16INK4A(+) was 100 ％ (28/28),which was the highest.Conclusion Detection on the expression of HPVL1 capsid protein and tumor suppressor gene p16INK4A can diverse different levels of cervical lesions and separate cases from aggravated or self-healing,to avoid over-treatment or misdiagnose.

The diagnostic value of fibro-optic bronchoscopy examination combined with detection of aberrant p16 promoter methylation in lung cancer / 中华全科医师杂志

Fibro-optic bronchoscopy (FB) examinations were undertaken in 42 cases with lung cancer and 25 cases with benign lung disease; methylation-specific PCR was performed in plasma, sputum and bronchoalveolar lavage fluid (BALF) specimen for detection of p16 gene promoter methylation in all patients.Of the 42 cases of lung cancer, the positive rates of p16 gene promoter methylation were 59.5% in BALF, 52.4% in plasma and 47.6% in sputum, respectively; while p16 gene promoter methylation was detected only in one plasma sample from 25 cases with benign lung disease ( P ＜ 0.05 ).The sensitivity,specificity and overall accuracy of FB were 59.5%, 100.0% and 74.6%, respectively.The sensitivity,specificity and overall accuracy of FB combined with aberrant p16 gene methylation in diagnosis of lung cancer were 92.9%, 96.2% and 94.0%, respectively.The FB examinations combined with detection of aberrant p16 gene methylation can further improve the accuracy to diagnosis of lung cancer.

O papel do gene p16 e do gene Dapk no controle do ciclo celular e na via carcinogênese vulvar / The role of p16 and Dark genes in cell cycle control and in the pathways of vulvar carcinogenesis

O câncer vulvar é o quarto tipo de câncer mais comum nas mulheres e representa 4,8% dos cânceres do trato genital inferior. O carcinoma de células escamosas é responsável por 80 a 90% de todos os cânceres de vulva. O carcinoma escamoso vulvar e suas lesões pré-malignas parecem desenvolver-se por dois caminhos distintos, baseados em características etiológicas e histopatológicas, tendo assim uma etiologia heterogênea. Um dos caminhos está relacionado com a infecção pelo HPV, e o outro, com as desordens epiteliais, tais como líquen escleroso e hiperplasia epitelial. O HPV é um importante fator causal das neoplasias do trato genital inferior. Ele está presente em cerca de 90% dos cânceres do colo uterino e 30 a 40% dos cânceres de vulva. O tipo mais prevalente é o 16, seguido pelos tipos 18, 45, 31 e 33. O estudo das alterações genéticas e epigenéticas, por meio da análise de metilação e imunoexpressão gênica, tem demonstrado uma grande versatilidade para o monitoramento molecular de pacientes com câncer, o que impulsiona pesquisas de métodos diagnósticos e terapêuticos do câncer. Nesta atualização pretendeu-se demonstrar as funções dos genes p16 e DAPK e as recentes pesquisas sobre a expressão destes genes nas vias da carcinogênse vulvar.

Vulvar cancer is the fourth commonest kind of cancer in women and it represents 4.8% of cancers in the lower genital tract squamous cell carcinoma is responsible for 80-90% of all vulvar cancers. Squamous cell carcinoma and it's premalignant lesions seem to develop in two distinct pathways, based on etiological and histopathological characteristics, thus forming a heterogeneous etiology. Whereas one of the pathways is related to HPV infection, the other is related to epithelial disorders such as: lichen sclerousus and epithelial hyperplasia. HPV is an important contributing factor of neoplasia in the lower genital tract. It is found in 90% of cervical cancers and in 30-40 % of vulvar cancers. The most prevalent kind is 16, followed by 18, 45, 31, and 33. The study of genetic and epigenetic alterations by means of methylation and genic immunoexpression has demonstrated great versatility to the monitoring ofpatients with cancer, which boosts researches of diagnostic and therapeutic methods for cancer. This update intends to demonstrate the role of p16 and DAPK genes as well as the recent researches regarding the expression of these genes in the pathways of vulvar carcinogenesis.

The expression and significance of hypermethylation of p16 and RASSF1A genes in cervical carcinoma tissues / 肿瘤

Objective: To study the expression and significance of aberrant methylation of p16 and Ras association domain family A (RASSF1A) in cervical carcinoma. Methods: The cervical samples were divided into three groups: cervical carcinoma (CC) group (n = 40), cervical intraepithelial neoplasia (CIN) group (n =80), and normal control group (n=20). The aberrant methylation of p16 and RASSF1A were detected by using methylation-specific reverse transcriptase polymerase chain reaction (MSP). Results: Methylation of pl 6 and RASSF1A genes were not detected in normal control group. The positive rate of p16 gene methylation was significantly higher in CC group than that in CIN group (40.00% vs 12.5%). The difference was statistically significant (χ2 = 11.88, P < 0.05). The positive rate of RASSFIA gene methylation was significantly higher in CC group than that in CIN group (20.0 % vs 7.5%). There was significant difference (χ2 = 4.04, P < 0.05). The positive rates of RASSF1A and p16 genes methylation were significantly higher in CC group than CIN group (55.0% vs 17.5%). The difference was significant (χ2 = 17.12, P < 0.05). Conclusion: Methylation status in the promoter regions of p16 and RASSF1A genes correlated with biological behaviors of cervical carcinoma. They may provide help in assistant diagnosis and treatment of cervical carcinoma.

Difference of tumor cell proliferative capability and the interrelated genes'expression in the center and edge tissues of colon cancer / 中华消化杂志

Objective To investigate the difference of tumor cell proliferation between the center and the edge tissues of human colon cancer and its relationship with the expression and methylation of p16 and p14 gene.Methods The expression of Ki67,P14 and P16 protein was assessed by immunohistochemistry,methylation status and mRNA expression of p16 and p14 gene in different area of colon cancer tissue were analyzed by methylation-specific PCR.RT-PCR and microdissection technique. Results There was significant difference in expressions of Ki67 between the center(100.0%) and the edge (30.1%) tissue in 42 cases of colon cancer(P

Study of the relationship of alteration and expression of p16 gene and p16 protein on the hilar cholangiocarcinoma / 中国普通外科杂志

Objective To investigate the effect of genetic alteration(homozygous deletion and point mutation)and expression of p16 gene and p16 protein on hilar cholangiocarcinoma(HCGC) . Methods Genetic alteration and expression of p16 protein were detected by polymerase chain reaction single strand comformation polymorphism (PCR-SSCP) and immunohistochemical method in 36 HCGC tissues. Results p16 gene revealed alteration in 21 of 36 HCGC tissues (58.3%),among which 8 had homozygous deletion and 13 had point mutation. In HCGC tissues, 8 revealed no p16 protein expression and 10 showed low level expression of p16 protein. Conclusions The alteration of p16 gene and abnormal expression of p16 protein are significantly correlated with the biological behavior and clinical staging of HCGC,and may be helpful to evalute the malignant degree of HCGC and the patients prognosis.

Significancy of expression of tumor suppressor gene PTEN and p16 protein in cholangiocarcinoma / 中国普通外科杂志

Objective To investigate the relationship between the expression of tumor suppressor gene PTEN and p16 protein and the biologcal behaviors of cholangiocarcinomas.Methods The expression of PTEN and p16 protein in 43 of cholangiocarcinoma tissues and 10 chronic cholangitis tissues were investigated by immunohisto-chemical technique.The relationship between expression of PTEN and p16 protein and the clinicopathological parameters of cholangiocarcinoma was analyzed. Results The positive expression rate of PTEN and p16 protein in cholangiocarcinoma was 39.5% and 44.2%,respectively.The expression of PTEN and p16 protein were positively relatad with the TNM staging,differentiation degree and metastasis of cholangiocarcinoma (P