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You are here: Home / NEWS . . . . . . . . / Science & Medicine / Women's Health / Pap Testing / Human Papilloma Virus and Cancers

Human Papilloma Virus and Cancers

October 13, 2010 By Jonathan Leave a Comment

Health News for Americans

October 12, 2010

By Sameera Mohotti (BSc, MSc, MD(MA))

In recent years, it has become clear that certain types of human cancers have a viral component to their etiology. Cancers due to Human Papilloma Virus (HPV) are most common among these. This has been a study of intense research for number of years. Specific types of HPV genotypes were found to be the causative agents of some common cancers, most notable invasive cervical carcinoma. Apart from this anogenital cancer, HPV’s are also causally associated with other anogenital cancers such as cancers of vulva, vagina, penis and anus. HPV is also responsible for approximately 20-30% of head and neck cancers [1].

Association OF HPV with Cervical cancer

The link between HPV and cervical cancer is now established beyond doubts. Many epidemiological [2], [3] and molecular evidences [4] suggest the causal association of HPV’s with cervical cancer. It has been estimated that about 500,000 women acquire cervical cancers every year and 75% of this are from developing countries. In United States about 13000 cervical cancer cases are diagnosed every year and about 7000 deaths annually from prevalent disease [5].
Evidence suggests that the great majority of all grades of cervical intraepithelial neoplasia can be attributed to cancer-associated types of HPV infections [3]. It has been estimated that only about 10% of the HPV patients would develop cervical dysplasia and of these only few people would develop cervical cancer. Studies conducted on HPV DNA in a variety of genital lesions suggested that HPV types 16 and 18 are most closely associated with risk of genital cancers [4] and some of HPV types are considered to be more prevalent among cervical cancer patients in a specific geographical areas; HPV 45 in Western African [6].
The development of cervical cancer is associated with factors other than just high risk HPV infection. Factors like impaired cell mediated immunity, long term use of contraceptives and smoking also increase the risk of gaining and the persistence of HPV types which in turn may lead to cervical cancers [7],[8].

Association of HPV with other anogenital cancers

Strong links between HPV and anogenital cancers such as penile, anal, vulvar cancers have been demonstrated by many studies. These cancers are formed from lesions develop in the vagina, vulva, penis and anus as the result of sexual contact [9]. But the exact role of HPV in the natural history of anal squamous intraepithelial lesions is still unknown [10].
Studies indicate that about 1% of sexually active adults in the United States show visible genital wart and about 15 % have sub clinical infection. The most commonly detected HPV types were found to be HPV 16 and 18 [11]. But, HPV types 56, 59-64 and 71 also have been isolated in vulvar intraepithelial neoplasia [12] .

Association of HPV with head and neck cancer

The term head and neck cancer refer to the cancers in the oral cavity, lip, nose, para nasal sinuses, naso-pharynx, oro-parynx, larynx, oesophagus, salivary glands, soft tissues of the neck and ear. Oral cancer is the sixth most prevalent cancer worldwide and about 620,000 patients are diagnosed with cancer of oral cavity every year [13]. Many studies have found evidence suggestive of a role for human papilloma virus in head and neck cancer [14],[15]. Though the exact mode of transmission of HPV infection in the head and neck region has not been determined, it’s association with sexual behavior and perinatal transmission have been demonstrated [16].
During the pathogenesis of HPV, it enters to the host through the mucosal epithelial layer surface. Oral mucosa resembles the mucosa of the genital region in their histological structure. As the correlation between HPV and cervical cancer are well established, the resemblance of the mucosal histology led to the suggestion that HPV could play a role in the development of benign and malignant lesions of the oral mucosa [17].
After the first report of papilloma virus in tongue carcinoma[14], many studies have shown the presence of HPV DNA in oral cavity [15] and head and neck cancer [13]. The most prevalent HPV types in these were found to be HPV 16 and 18. Further epidemiologic and molecular investigation should be carried out to establish a precise relationship between HPV and head and neck cancer.

HPV INDUCED CANCER DETECTION

Detective measures to date have centered on screening programs for HPV induced cancers. The most common and the traditional way of screening for cervical cancer and cervical dysplasia are to conduct a pap smear test. This has significantly reduced the incidence of cervical cancers in recent years. If the result is turned out to be positive, then the colposcopy would be carried. Since cervical cancer and anal cancer resembles in their biological features, it has been observed that screening for anal high grade squamous intraepithelial lesions with anal pap smear allows detecting individuals at risk of developing anal cancers. To obtain a confirmatory result, an anoscopic examination should be performed [18, 19].

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Filed Under: Pap Testing Tagged With: cervarix, Cervical Cancer HPV, Gardasil/Silgard, HPV VACCINES, Pap Testing, vaccinations

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