AIM: To investigate the possible roles of p53 and C-mycgenes in the primary hepatocellular carcinogenesis and therelationship between the liver hyperplastic nodule(LHN) andhepatocellular carcinoma(HCC).METHODS: The ex...AIM: To investigate the possible roles of p53 and C-mycgenes in the primary hepatocellular carcinogenesis and therelationship between the liver hyperplastic nodule(LHN) andhepatocellular carcinoma(HCC).METHODS: The expression of p53 and C-myc genes wasdetected immunohist-ochemically in 73 and 60 cases of HCCand pericarcinomatous tissues, respectively .RESULTS: The positive expression of p53 in HCC wassignificantly higher than that in pericarcinomatous tissues(P＜0.05). In pericarcinomatous tissues, the p53 expressionwas observed only in LHN, but not in liver cirrhosis (LC) andnormal liver tissues. The positive expression rate of C-mycin HCC or LHN was significantly higher than that in LC ornormal liver tissues (P＜0.05 and P＜0.01), however, nosignificant difference was found between HCC and LHN(P＞0.05). The positive expression rate of p53 and C-myc inHCC was correlated with the histological differentiation, thatin the poorly differentiated was significantly higher than thatin well differentiated samples (P＜0.05).CONCLUSION: The overexpression of p53 and C-myc genesmight play a role in the carcinogenesis of HCC; And LHNseems a preneoplastic lesion related to hepatocarcinogenesis;No evidence supports that LC contribute directly to thehepatocarcinogenesis.展开更多
INTRODUCTIONIn China ,the incidence and mortality of gastric cancer rank the second among all cancers. Recent development of cancer [1-20].The aim of this study was investigat the insight of apoptosis and bcl-2, p53 a...INTRODUCTIONIn China ,the incidence and mortality of gastric cancer rank the second among all cancers. Recent development of cancer [1-20].The aim of this study was investigat the insight of apoptosis and bcl-2, p53 and C-myc protein expression in the development of gastric cancer .展开更多
Previous epidemiological studies have shown association between coal burning and human lung cancer.To confirm relationship between coal burning and lung cancer formation and progression the expression of p53 and c-myc...Previous epidemiological studies have shown association between coal burning and human lung cancer.To confirm relationship between coal burning and lung cancer formation and progression the expression of p53 and c-myc in 13 mouse lung cancer induced by coal burning smoke and 5 mouse lung tissue control was studied by DNA-RNA in situ hybridization (ISH). Nine of 13 specimens showed c-myc overexpression but it occurred only 1 of adjacent tissue. There was over pression of p53 mRNA in all 13 lung cancer and 5 adjacent tissue. None in the controls was expression of P53 and c-myc detected. When compared to controls,there was significant higher expression of c-myc gene (P=0.002) and p53 gene (P=0.0001 ).The results confirm that overexpression of p53 and c-myc are common molecular events of lung cancer by coal burning smoke and provide further evidence that smoke from coal burning is a causative agent of lung cancer.展开更多
BACKGROUND The high prevalence of human papillomavirus(HPV)infection in oropharyngeal squamous cell carcinoma(SCC)is well established,and p16 expression is a strong predictor.HPV-related tumors exhibit unique mechanis...BACKGROUND The high prevalence of human papillomavirus(HPV)infection in oropharyngeal squamous cell carcinoma(SCC)is well established,and p16 expression is a strong predictor.HPV-related tumors exhibit unique mechanisms that target p16 and p53 proteins.However,research on HPV prevalence and the combined predictive value of p16 and p53 expression in head and neck cutaneous SCC(HNCSCC),particularly in Asian populations,remains limited.This retrospective study surveyed 62 patients with HNSCC(2011-2020),excluding those with facial warts or other skin cancer.AIM To explore the prevalence of HPV and the predictive value of p16 and p53 expression in HNCSCC in Asian populations.METHODS All patients underwent wide excision and biopsy.Immunohistochemical staining for HPV,p16,and p53 yielded positive and negative results.The relevance of each marker was investigated by categorizing the tumor locations into high-risk and middle-risk zones based on recurrence frequency.RESULTS Of the 62 patients,20(32.26%)were male,with an average age of 82.27 years(range 26-103 years).High-risk included 19 cases(30.65%),with the eyelid and lip being the most common sites(five cases,8.06%).Middle-risk included 43 cases(69.35%),with the cheek being the most common(29 cases,46.77%).The p16 expression was detected in 24 patients(38.71%),p53 expression in 42 patients(72.58%),and HPV in five patients(8.06%).No significant association was found between p16 expression and the presence of HPV(P>0.99),with a positive predictive value of 8.33%.CONCLUSION This study revealed that p16,a surrogate HPV marker in oropharyngeal SCC,is not reliable in HNCSCC,providing valuable insights for further research in Asian populations.展开更多
基金the scientific research fundation of Shandong Provincial Education Committee(J94,K26)
文摘AIM: To investigate the possible roles of p53 and C-mycgenes in the primary hepatocellular carcinogenesis and therelationship between the liver hyperplastic nodule(LHN) andhepatocellular carcinoma(HCC).METHODS: The expression of p53 and C-myc genes wasdetected immunohist-ochemically in 73 and 60 cases of HCCand pericarcinomatous tissues, respectively .RESULTS: The positive expression of p53 in HCC wassignificantly higher than that in pericarcinomatous tissues(P＜0.05). In pericarcinomatous tissues, the p53 expressionwas observed only in LHN, but not in liver cirrhosis (LC) andnormal liver tissues. The positive expression rate of C-mycin HCC or LHN was significantly higher than that in LC ornormal liver tissues (P＜0.05 and P＜0.01), however, nosignificant difference was found between HCC and LHN(P＞0.05). The positive expression rate of p53 and C-myc inHCC was correlated with the histological differentiation, thatin the poorly differentiated was significantly higher than thatin well differentiated samples (P＜0.05).CONCLUSION: The overexpression of p53 and C-myc genesmight play a role in the carcinogenesis of HCC; And LHNseems a preneoplastic lesion related to hepatocarcinogenesis;No evidence supports that LC contribute directly to thehepatocarcinogenesis.
基金Supported by the Medical Research Foundation of Guangdong Province,No.1997423
文摘INTRODUCTIONIn China ,the incidence and mortality of gastric cancer rank the second among all cancers. Recent development of cancer [1-20].The aim of this study was investigat the insight of apoptosis and bcl-2, p53 and C-myc protein expression in the development of gastric cancer .
文摘Previous epidemiological studies have shown association between coal burning and human lung cancer.To confirm relationship between coal burning and lung cancer formation and progression the expression of p53 and c-myc in 13 mouse lung cancer induced by coal burning smoke and 5 mouse lung tissue control was studied by DNA-RNA in situ hybridization (ISH). Nine of 13 specimens showed c-myc overexpression but it occurred only 1 of adjacent tissue. There was over pression of p53 mRNA in all 13 lung cancer and 5 adjacent tissue. None in the controls was expression of P53 and c-myc detected. When compared to controls,there was significant higher expression of c-myc gene (P=0.002) and p53 gene (P=0.0001 ).The results confirm that overexpression of p53 and c-myc are common molecular events of lung cancer by coal burning smoke and provide further evidence that smoke from coal burning is a causative agent of lung cancer.
基金Supported by the National Research Foundation of Korea,No.2020R1A2C1100891Soonchunhyang University Research Fund,No.2024-05-014.
文摘BACKGROUND The high prevalence of human papillomavirus(HPV)infection in oropharyngeal squamous cell carcinoma(SCC)is well established,and p16 expression is a strong predictor.HPV-related tumors exhibit unique mechanisms that target p16 and p53 proteins.However,research on HPV prevalence and the combined predictive value of p16 and p53 expression in head and neck cutaneous SCC(HNCSCC),particularly in Asian populations,remains limited.This retrospective study surveyed 62 patients with HNSCC(2011-2020),excluding those with facial warts or other skin cancer.AIM To explore the prevalence of HPV and the predictive value of p16 and p53 expression in HNCSCC in Asian populations.METHODS All patients underwent wide excision and biopsy.Immunohistochemical staining for HPV,p16,and p53 yielded positive and negative results.The relevance of each marker was investigated by categorizing the tumor locations into high-risk and middle-risk zones based on recurrence frequency.RESULTS Of the 62 patients,20(32.26%)were male,with an average age of 82.27 years(range 26-103 years).High-risk included 19 cases(30.65%),with the eyelid and lip being the most common sites(five cases,8.06%).Middle-risk included 43 cases(69.35%),with the cheek being the most common(29 cases,46.77%).The p16 expression was detected in 24 patients(38.71%),p53 expression in 42 patients(72.58%),and HPV in five patients(8.06%).No significant association was found between p16 expression and the presence of HPV(P>0.99),with a positive predictive value of 8.33%.CONCLUSION This study revealed that p16,a surrogate HPV marker in oropharyngeal SCC,is not reliable in HNCSCC,providing valuable insights for further research in Asian populations.
文摘目的 :观察 p5 3和 c myc两种蛋白在增生性瘢痕和正常皮肤组织内的表达特征及其对增生性瘢痕内细胞凋亡发生的影响。方法 :在 16份被测标本中包括创面愈合后不同时期的增生性瘢痕 8例和其对应的周围正常皮肤组织 8例 ,用免疫组织化学方法和常规病理技术确定 p5 3和 c myc两种蛋白在增生性瘢痕和正常皮肤组织中的定位和表达量及变化规律。结果 :p5 3和 c myc蛋白在正常皮肤和瘢痕组织内都有表达。正常皮肤组织中 p5 3蛋白主要分布于表皮基底层细胞的胞质和胞核中 ;而 c myc蛋白的阳性信号则存在于表皮基底细胞、血管内皮细胞、毛囊和汗腺细胞的胞浆和胞核内。增生性瘢痕组织中 p5 3和 c myc两种蛋白表达均增强 ,p5 3主要存在于角质形成细胞和部分成纤维细胞的胞质和胞核内 ;而 c m yc阳性表达颗粒则分布于表皮细胞和部分成纤维细胞内。与正常皮肤组织相比 ,增生性瘢痕的 p5 3蛋白含量虽有增高趋势 ,但差异不显著 ;而c m yc蛋白的阳性颗粒明显增多。结论 :在增生性瘢痕发生过程中 ,p5 3和 c myc蛋白不同的分布和表达变化规律显示 ,这两种蛋白可能参与调控增生性瘢痕形成过程中细胞凋亡的发生 ,以 c myc蛋白的作用更为重要。
