Method of detection of carcinogenic human papillomavirus

Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving virus or bacteriophage

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435 912, 435 6, 536 2432, 536 2433, C12Q 168, C12Q 170, C12P 1934, C07H 2104

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057834121

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BRIEF SUMMARY
TECHNICAL FIELD OF INVENTION

This invention relates to a method for the specific detection of the DNA of papillomaviruses in clinical samples. In particular, the test aims to differentiate, in the shortest possible time, whether cells from the anogenital region contain types of papillomavirus that are associated with cancer or whether they contain types of papillomavirus that are generally associated with benign lesions. Such differentiation has important implications in patient evaluation and follow-up.


BACKGROUND

Cancer of the cervix is the most common cancer in women (.about.25% of all female cancer). Moreover, the incidence is increasing in younger women. Indeed, approximately 2% of routine cervical smears show abnormal cytology, indicating an epidemic. Such an epidemic is current in many western and developing countries. Sexual activity appears to be an important predisposing factor in the epidemiology of carcinogenesis and precancerous lesions. An early age of sexual intercourse and multiplicity of sexual partners are associated statistically with an increased risk of are often men with penile warts ("high risk males"), and a very high proportion (>90%) of cervical carconoma tissue contain detectable DNA sequences for known varieties of the human papillomavirus (HPV). This supports a growing body of evidence implicating certain types of HPV as the sexually transmitted factor involved in the development of Med.Virol. 30: 170-86, 1984; zur Hausen, Progr. Med.Virol. 32: 15-21, 1985; zur Hausen, Cancer 59: 1692-6; Campion et al., Lancet i: 943-6, 1985!. The prevalence of cervical cancer and precancerous lesions is becoming increasingly more common in younger women. Without treatment it can be fatal, the death rate being .about.100 per million women per year in Western countries. Fortunately, if detected at an early stage, effective treatment is available that can eliminate the fatal consequences.
The immediate management and subsequent follow-up young women with abnormal cytological smears who still wish to bear children presents many problems. This has been compounded by uncertainty about the interpretation of smears with features of papillomavirus infection ("kilocytes") as well as dysplasia. Moreover, the current cytological testing tool for cervical cancer screening, the Pap smear, has a false negative rate of .about.20%. Significant numbers of dysplastic lesions regress spontaneously, others fail to progress, while a few progress rapidly. Thus, from an ill-defined cloud of morphological abnormalities occasional cancers develop. At present there is no clear way to predict whether cancer will result if a Pap smear happens to be abnormal. Clinical examination of many of these patietns has failed to find warty lesions (condylomata accuminata) on the external genitalia or, indeed, on the cervix itself. The more difficult procedure of colposcopy, after the application of 3% acetic acid, is, in fact, required, revealing the presence of flat ("non-condylomatous") warts (which are invisible to the naked eye). These articles suspected premalignant lesions. Histopathological progression of the wart to Dyson et al., J. Clin. Path. 37: 126-31, 1984!. An increasingly prevalent problem is the occurrence of invasive cancer within 3 years of a negative Med. J. Aust. 2: 597, 1981!. Whereas the presence of papillomavirus replication may be confirmed in cervical condylomata by detection of virus particles or the group-specific antigen, neither particles nor antigen have, however, been found in squamous cell carcinoma tissue.
In contrast to the uncertainty and controversy that surrounds the interpretation of tests based on morphology, the new techniques in molecular biology can be utilised by bypass such problems and provide more objective information. By using nucleic acid hybridization techniques the viral DNA can be identified directly and at an earlier stage of infection. Indeed, using these approaches, HPV types have been found in both benign and premalignant lesions.
At present .about.50 types of the papill

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