Loss of the adenomatous polyposis coli gene and human papillomavirus infection in oral carcinogenesis

Recent evidence suggests that loss of heterozygosity (LOH) of the adenomatous polyposis coli (APC) gene plays a role in colorectal tumorigenesis and other cancers. However, little is known as to whether the APC gene contributes to the pathogenesis of oral squamous cell carcinoma. To assess involvement of both the APC gene and the human papillomavirus (HPV) in the development of oral pre-malignant and malignant lesions, we analysed DNA from 14 paired oral normal and pre-malignant or malignant paraffin-embedded biopsy specimens, and DNA from cultured normal and HPV 16-immortalised oral epithelial cells for the presence of LOH of APC and for HPV infection, using PCR based techniques. LOH of APC occurred in 80% of cases of oral epithelial dysplasia, 67% of carcinoma in situ, 50% of invasive squamous cell carcinoma cases, and in the HPV 16-immortalised oral epithelial cells. HPV was detected in half of the biopsy specimens, with HPV 16 as the dominant type. More than half of the carcinoma cases were found to contain both LOH of APC and HPV infection. These results suggest that LOH of APC is an early event during oral tumorigenesis. Our findings also suggest a strong correlation between HPV infection, particularly HPV 16, and LOH of the APC gene in oral squamous cell carcinomas.     

正常口腔黏膜和口腔鳞癌中人乳头瘤病毒感染率的研究进展

黏膜高危型HPV-16、HPV-18感染是宫颈癌的主要致病因素,且与口腔鳞癌的发生密切相关,但目前对口腔鳞癌中HPV的感染率和亚型的分布尚不十分清楚。作者系统查阅了目前已经发表的有关HPV在正常口腔黏膜或口腔鳞癌中感染率和亚型分布的文献资料,对正常口腔黏膜、口腔鳞癌中人乳头瘤病毒的感染率的研究进展进行了综述。     

In situ hybridization analysis of human papillomavirus DNA in oral mucosal lesions.

Commercial biotinylated DNA probes specific for human papillomavirus (HPV) types 6 and 11; 16 and 18; and 31, 33, and 35 were used for in situ hybridization analysis of 105 oral mucosal specimens from 5 cases of verruca vulgaris, 15 cases of condyloma acuminatum, 30 cases of squamous papilloma, 20 cases of hyperkeratosis/acanthosis, 15 cases of epithelial dysplasia, 5 cases of carcinoma in situ, and 15 cases of squamous cell carcinoma. Positive hybridization signals were found in 26 specimens (24.8%). Only HPV-6/11 was detected. HPV DNA occurred significantly more often (p less than 0.005, chi-square analysis) in condyloma acuminatum (100%) and verruca vulgaris (100%) than squamous papilloma (13.3%), hyperkeratotic/acanthotic lesions (10%), and malignant and premalignant lesions (0%). The tongue (19.1%) and labial epithelium (17.1%) were infected most frequently. Nuclear reaction products indicating HPV infection were associated primarily with koilocytes. These results demonstrate the usefulness of commercial biotinylated probes for HPV DNA analysis in routine paraffin-embedded lesion specimens. They confirm HPV involvement in benign lesions of the oral mucosa but fail to associate HPV infection with oral cancer and precancer.     

Toll-like receptor 2 rs4696480 polymorphism and risk of oral cancer and oral potentially malignant disorder

ObjectivesThe aim of this study was to identify the possible association between TLR polymorphisms and an increased risk of developing head and neck cancer, including oral (OSCC) and laryngeal squamous cell carcinoma (LSCC), and oral potentially malignant disorders, such as oral lichenoid disease (OLD), including oral lichen planus (OLP) and oral lichenoid lesions (OLL).DesignThis case-control study included 40 OSCC, 35 LSCC, 175 OLD (129 OLP and 46 OLL) patients and 89 healthy controls, all of them from the Basque Country, Spain. Genetic polymorphisms in TLR1, TLR2, TLR4, TLR6, TLR9, and TLR10 were genotyped by TaqMan^® assays or pyrosequencing.ResultsThe chi-square analysis showed that the variant A of the SNP TLR2-rs4696480 polymorphism significantly increased the risk of OSCC (p = 0.03) and OLL (p = 0.02).ConclusionsThe TLR2-rs4696480 polymorphism may be relevant to OSCC and OLL susceptibility in this population encouraging further studies on the TLR2 pathway and its possible association with this group of oral potentially malignant disorders and oral cancer. This may also prove the use of TLR polymorphisms as risk markers for oral and laryngeal cancer.     

Progressive increase of human papillomavirus carriage rates in potentially malignant and malignant oral disorders with increasing malignant potential

Introduction:  We investigated the potential role of human papillomaviruses (HPVs) in potentially malignant oral disorders, oral leukoplakia (OL) and oral lichen planus (OLP), and in oral squamous cell cancer (OSCC) in an Eastern Hungarian population with a high incidence of OSCC.
Methods:  Excised tumor samples (65 OSCC patients) and exfoliated cells from potentially malignant lesions (from 44 and 119 patients with OL and OLP, respectively) as well as from healthy controls (72 individuals) were analysed. OLPs were classified based on clinical appearance, 61 patients had erosive–atrophic lesions (associated with higher malignancy risk, EA-OLP) and 58 had non-erosive non-atrophic lesions (with lower risk of becoming malignant, non-EA-OLP), respectively. Exfoliated cells collected from apparently healthy mucosa accompanied each lesion sample. HPV was detected by MY/GP polymerase chain reaction (PCR) and genotyped by restriction analysis of amplimers. Copy numbers in lesions were determined using real-time PCR. Prevalence rates, copy number distributions, and association with risk factors and diseases were analysed using chi-square test, t -test, and logistic regression, respectively.
Results:  We detected HPVs significantly more frequently in lesions than in controls ( P  ≤ 0.001 in all comparisons). HPV prevalence increased gradually with increasing severity of lesions (32.8, 40.9, and 47.7% in OLP, OL, and OSCC, respectively). Copy number distribution patterns roughly corresponded to prevalence rates, but OLP and OL were comparable. HPV prevalence differed significantly between EA-OLP and non-EA-OLP groups (42.6 vs. 22.4%); EA-OLP group showed a prevalence similar to that found in OL.
Conclusion:  HPVs may be involved in the development or progression of not only OSCC but also of potentially malignant oral lesions.     

Biopsy vs. superficial scraping: detection of human papillomavirus 6, 11, 16, and 18 in potentially malignant and malignant oral lesions

BACKGROUND: Several epidemiologic studies have shown a broad variation in the prevalence of human papillomavirus (HPV) in oral precancerous tissues and oral carcinomas. METHODS: Biopsies and superficial scrapes of lesions, clinically suspected of HPV infection, were taken from patients with potentially malignant and malignant oral lesions, and subject to HPV DNA detection by PCR-Southern blot analysis. RESULTS: From 22 patients with potentially malignant and malignant lesions analyzed, 41% of the biopsies were HPV DNA positive, whereas 95-100% of the superficial scrapes were positive (McNemar, P < 0.0001). Clinical presumption of HPV infection detected 67% (P < 0.0001) of the HPV DNA positive cases compared with 48% (P < 0.0001) determined by cytology and histopathology. The prevalence of HPV 6, 11, 16 and 18 in the oral mucosa was studied in 59 individuals. While 9% of normal controls were HPV DNA positive, 100% of the patients with potentially malignant and malignant lesions were HPV DNA positive, and the prevailing genotype was HPV 16 followed by HPV 18. CONCLUSIONS: The higher HPV DNA detection rate in superficial oral scrapes than in biopsies suggests that accurate epidemiological information on oral HPV infection/oral carcinogenesis depends not only on the DNA detection technique, but also on the tissue/cell sampling procedure.     

Valuation of exfoliative cytology as prediction factor in oral mucosa lesions

The aim of this study was immunolabeling oncoproteins Ck14, p53, p21 and Bcl-2 in order to evaluate their expression in premalignant and malignant stomatological lesions in oral epithelial, and to compare this expression with exfoliative cytology alterations in the same patients. It was studied biopsies and cytologies of 13 subjects with oral lichen planus, with or without Human Papilloma Virus (HPV), leukoplakia and squamous cell carcinoma clinically diagnosed and confirmed by anatomopathological studies. The oral lichen planus lesion presented binuclei orange cells; and in leukoplakia lesions only orange stained was observed; meanwhile koilocytes, inflammatory cells, enlarge nuclear volume and pathogenic microorganisms were observed in the HPV infections and squamous cells carcinoma (SCC). The Ck14, p53, p21 and Bcl-2 proteins were found modified in the leukoplakia, oral lichen planus and cancer. Cytological alterations and positive immunolabeling or over-expression of Ck14 cytokeratine in the upper epithelial stratus should be indicator of malignant transformations as doing subsequence exams.     

Increase in detection of oral cancer and precursor lesions by dentists: Evidence from an oral and maxillofacial pathology service

BackgroundDentists play an important role in the detection and diagnosis of oral diseases, including oral cancer and its precursor lesions. There are few comprehensive reviews in the recent literature that examine the scope and trends of oral disease diagnoses by dentists.MethodsThe authors analyzed all accessions to the Toronto Oral Pathology Service at the Faculty of Dentistry at the University of Toronto in Toronto, Ontario, Canada, from 2005 through 2015 using a custom-built database. They used these data to calculate the temporal trends in the diagnoses of oral epithelial dysplasia (OED) and oral squamous cell carcinoma (OSCC).ResultsA total of 63,483 biopsy specimens were submitted primarily by dentists from 2005 through 2015. From these, 2,679 cases of OED and 828 OSCC were diagnosed. The authors’ results show a 3.8-fold increase in the number of epithelial dysplasias and a 1.8-fold increase in mucosal carcinomas over the study period. The rate of increase of OED and OSCC was significantly higher than the rate of increase of total oral carcinomas diagnosed in the region, the population changes, and the number of dentists in the region.Conclusions and Practical ImplicationsWithin the limitations of a study of a single large oral pathology biopsy service, the analysis of diagnoses shows that dentists are increasingly involved in the detection of oral mucosal carcinoma and precursor lesions. The dental community plays an important and increasing role in the detection of oral cancer and potentially malignant disorders. Increased awareness among oral health care and nonoral health care professionals may increase early detection of OSCC.     

口腔鳞状细胞癌与人乳头状瘤病毒感染的关系

本文用抗牛乳头状瘤病毒（ＢＰＶ）的抗血清对３１例口腔鳞状细胞癌中的人乳头状瘤病毒（ＨＰＶ）结构抗原进行检测，证明其中３０例口腔鳞状细胞癌中ＨＰＶ结构抗原一，说明口腔癌的发病与ＨＰＶ感染有密切关系，对防治ＨＰＶ感染，减少口腔癌的发病有着重要意义。     

口腔鳞癌中人乳头瘤病毒感染及树突状细胞分布的相关性研究

目的：探讨口腔鳞癌（OSCC）中人乳头瘤病毒（HPV）感染与树突状细胞（DC）分布的关系。方法：采用原位杂交技术（IsH）检测56例OSCC、26例口腔白斑（OLK）和10例正常口腔黏膜中HPVl6／18的感染情况,免疫组化EnVision法观察其中DC的分布表达。结果：OSCC和OLK组HPVl6／18感染率显著高于正常组（P〈0．05）,HPVl6／18感染与吸烟有一定相关性（P〈0．05）。HPVI~5／18感染的OSCC组织中CDla低表达（P〈0．01）。结论：ISH是检测HPV较理想的方法,HPV感染是部分口腔鳞癌的病因学因素,HPV感染患者局部免疫功能低下可能导致肿瘤免疫逃逸。     

Association between proliferative verrucous leukoplakia and infection with human papillomavirus type 16

Proliferative verrucous leukoplakia (PVL) is a recently described clinical entity characterized by multifocal oral lesions that frequently progress to oral cancer despite abstinence from tobacco use by most patients. To determine if this condition is associated with human papillomavirus (HPV), a polymerase chain reaction (PCR) for HPV DNA was performed on 9 lesions from 7 patients with PVL, histologically diagnosed with focal keratosis (1), papilloma (1), epithelial dysplasia (5) and squamous cell cancer (2). Eight (89%) were HPV positive, 7 for HPV 16. For comparison, we studied 55 non-PVL-associated oral specimens, including 24 oral squamous cell cancers. Of the cancers, 8 (33%) were HPV positive, 4 for HPV 16. These data suggest that HPV 16 infection may play an important role in the pathogenesis of PVL-associated oral dysplasia and possibly cancer, but is found in only a small proportion of the more common, non-PVL associated-oral lesions.     

Human papillomavirus infection and its association with HIV

Human papillomavirus (HPV) can infect oral mucosa, causing asymptomatic infection or warty lesions. Several case-control studies have confirmed HPV as an independent risk factor for squamous cell carcinoma. HPV-related cancers seem to have better prognoses and different risk factors than do HPV-negative ones. HIV-infected patients are known to be at increased risk for persistent genital and anal high-risk HPV infections and intraepithelial neoplasm. Since the era of highly active antiretroviral therapy, the prevalence and persistence of warty lesions in oral mucosa have increased. Oral squamous cell carcinoma was recently added in the case definitions for common HIV-related oral mucosa lesions. The increased risk of HPV infection in HIV patients has been associated with impaired immune response to HPV, highly active antiretroviral therapy, aging of the HIV-infected patients, and direct interaction between the 2 viruses. HPV32 seems to be much more prevalent in asymptomatic HPV infections and warts among those infected with HIV than among those in the general population. Regarding HIV genes, there is evidence of an interaction between HPV and tat, rev, and vpr. HIV might play a role in HPV-associated pathogenesis by exhorting oncogenic stimuli via tat and rev or visa versa.     

人乳瘤病毒16型和EB病毒感染与口腔鳞癌关系

用多聚酶链反应技术为２１例口腔鳞癌及癌旁正常组织成对标本中的人乳头瘤病毒１６型（ＨＰＶ１６）和ＥＢ病毒（ＥＢＶ）ＤＮＡ作检测。结果口腔鳞癌和癌旁正常组织ＨＰＶ１６ＤＮＡ阳性率分别为５２．４％和１４．３％，ＥＢＶ为８５．７％和３３．３％，ＨＰＶ１６和ＥＢＶ均为阳性者分别为４７．６％和９．５％，癌组织和癌旁正常组织间统计学上均有显著性差异。提示口腔粘膜ＨＰＶ１６或ＥＢＶ感染均与口腔鳞癌发生有关。ＨＰＶ１６和ＥＢＶ在口腔粘膜感染可能有协同致口腔鳞癌作用。     

The human papilloma virus, the vaccines, and oral and oropharyngeal squamous cell carcinoma: what every dentist should know

High-risk human papilloma virus (HPV) strains 16 and 18 have been shown to cause cervical cancer as well as other benign and malignant disorders. Oral and oropharyngeal squamous cell carcinoma (OOSCC) has been linked to high-risk HPV strains. Recent developments in the field of immunology have resulted in a vaccine to treat patients with HPV against cervical cancer. The widespread use of the HPV vaccine should reduce the risk of cervical cancer and could decrease the risk of OOSCC as well. This article examines the virus as well as the vaccines and how they could be used. A possible reduction in oral and oropharyngeal cancers as a result of widespread vaccination is discussed.     

Detection of potentially malignant and malignant lesions of oral cavity using autofluorescence visualization device

Light-based oral cancer screening aids have been developed in identifying potentially malignant and malignant lesions of oral cavity at their earliest stage. The VELscope system is a simple hand-held device that facilitates the direct visualization of oral-cavity fluorescence for the detection of precancerous and cancerous lesions. Some published reports have shown that this system can assist in the detection of precancerous and cancerous lesions, but there is no evidence that it can distinguish between them. We studied whether objective discrimination criteria can be set for this system when observing oral mucosal lesions. We examined 74 cases with biopsy-confirmed oral mucosal lesions; 37 squamous cell carcinoma lesions, 14 moderate to severe epithelial dysplasia lesions, 13 mild epithelial dysplasia lesions and 10 lichen planus lesions. Lesions were examined macroscopically under the conventional overhead light, and then, examined by this device. Each examination was recorded with a digital camera. We contrasted findings with histopathological manifestation, and calculated the attenuation score. It is found that several conditions and sites, such as keratinization and the degree of inflammatory cell infiltration, were associated with detection sensitivity using this device. Based on the attenuation scores, a significant difference was seen between squamous cell carcinoma and epithelial dysplasia. It is suggested that this device might be a valuable adjunct in the early detection of potentially malignant and malignant lesions of the oral cavity.     

Detection of human papillomavirus DNA by in situ DNA hybridization and polymerase chain reaction in premalignant and malignant oral lesions.

The sensitivity of detection of human papillomavirus (HPV) DNA in premalignant and malignant oral lesions by in situ hybridization (ISH) and polymerase chain reaction (PCR) were compared. With both methods HPV DNA was found in 4 of 24 cases of epithelial dysplasia, 4 of 14 cases of verrucous hyperplasia, and 1 of 10 cases of squamous cell carcinoma. The 10 cases of smokeless tobacco keratoses and 3 cases of verrucous carcinoma that we examined were all negative for HPV DNA. The PCR for the E6 open reading frame of HPV-16 correctly identified all cases that were positive by ISH. Only a single case that was positive by PCR was negative by ISH for HPV DNA. However, the PCR demonstrated the presence of HPV-16 infection in one case, which had hybridized most intensely with the probe for types 31/33/35 in the ISH. This discrepancy probably is due to the high degree of cross-hybridization in the ISH assay. PCR appears to be an effective technique for identifying HPV-16 DNA sequences in biopsy material from premalignant and malignant oral lesions.     

HPV与Survivin在口腔上皮组织中致癌作用研究

目的:研究口腔鳞癌(OSCC)及口腔黏膜白斑(OLK)组织中HPV感染与Survivin的表达,探讨上皮组织肿瘤的形成机制。方法:应用原位杂交法和免疫组化染色法分别检测30例OSCC组织,20例OLK组织及20例正常口腔黏膜组织中HPV及Survivin的表达情况。结果:Survivin在OSCC中的表达高于OLK中的表达,具有统计学意义。HPV阴性的OSCC中Survivin的表达明显高于HPV阳性OSCC组织;HPV阳性的OLK中survivin的表达明显高于HPV阴性的OLK组织。结论:Survivin可能通过抑制细胞凋亡调节HPV对口腔上皮的致癌作用,HPV感染对Survivin的表达水平存在调节作用。     

口腔癌中人乳头瘤病毒16型和Ha-ras癌基因点突变的研究

目的 检验口腔癌中的人乳头瘤病毒（ＨＰＶ）１６型ＤＮＡ和Ｈａ－ｒａｒ癌基因的点突变,探讨ＨＰＶ１６型和Ｈａ－ｒａｓ癌基因的点突变与口腔癌之间的关系。方法 应用多聚酶链反应（ＰＣＲ）技术扩增ＨＰＶ１６ＤＮＡ和Ｈａ－ｒａｓ癌基因相关片段,分别采用２％琼脂糖凝胶电泳和限制性片段长度多态性分析（ＲＦＬＰ）检测口腔癌中的ＨＰＶ１６ＤＮＡ和Ｈａ－ｒａｓ癌基因第１２位密码子的点突变,结果 在１７例口腔癌组中,６     

High risk human papillomavirus in oral squamous carcinoma: evidence of risk factors in a Venezuelan rural population. Preliminary report

In a search for the presence of human papillomavirus (HPV) and some etiologic cofactors in oral squamous cell carcinoma (OSCC), 50 women diagnosed as OSCC were analyzed by a multiplex polymerase chain reaction (PCR) assay specific for HPV types 6, 11, 16, and 18. This study revealed that 60% (30/50) of the OSCC patients were positive for HPV-DNA sequences. This group was analyzed according to smoking, alcohol consumption, number of pregnancies, poor oral health and low social economic status. The current results indicate an increased incidence of HPV malignant types in the oral cavity in women with OSCC. Also, they support a multifactorial model of oral cancer causation.     

Potentially malignant disorders—The case for intervention

Potentially malignant disorders (PMD) are recognisable mucosal conditions preceding invasive squamous carcinoma development. Established oral cancer remains a lethal and deforming disease, with a rising incidence. Management techniques for identifiable oral precursor lesions have traditionally been polarised between observational and interventional surgical techniques. By defining salient management goals for treating potentially malignant disease, and examining the evidence supporting the efficacy of treatment intervention, this paper presents the case for interventional laser surgery as a definitive diagnostic and treatment modality.