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The cause of CIN is chronic infection of the cervix with HPV, especially infection with high-risk HPV types 16 or 18. It is thought that the high-risk HPV infections have the ability to inactivate tumor suppressor genes such as the p53 gene and the RB gene, thus allowing the infected cells to grow unchecked and accumulate successive mutations, eventually leading to cancer.
Cervical cancer typically develops from precancerous changes called cervical intraepithelial neoplasia over 10 to 20 years. [3] About 90% of cervical cancer cases are squamous cell carcinomas, 10% are adenocarcinoma, and a small number are other types. [4] Diagnosis is typically by cervical screening followed by a biopsy. [2]
This disease can progress to invasive cancer (squamous cell carcinoma) of the cervix. Cervical squamous intraepithelial lesion (SIL), previously called cervical intraepithelial neoplasia (CIN), is a form of dysplasia that can progress to cervical cancer. The term carcinoma in situ may be used interchangeably with high-grade SIL. [8]
It resembles small-cell cancer of the lungs and accounts for less than 3% of all cervical cancers. Like small-cell cancer in the lungs, the lymph nodes play a major role in spreading the cancer throughout the body. SCC begins in the inner part of the cervix and is very hard to diagnose.
Villoglandular adenocarcinoma of the cervix is a rare type of cervical cancer that, in relation to other cervical cancers, is typically found in younger women and has a better prognosis. [1] A similar lesion, villoglandular adenocarcinoma of the endometrium, may arise from the inner lining of the uterus, the endometrium. [2]
A cervical polyp is a common benign polyp or tumour on the surface of the cervical canal. [2] They can cause irregular menstrual bleeding but often show no symptoms. Treatment consists of simple removal of the polyp and prognosis is generally good. About 1% of cervical polyps will show neoplastic change which may lead to cancer.
The main treatments for CTLN1 include a low-protein, high-calorie diet with amino acid supplements, particularly arginine. The Ucyclyd protocol, using buphenyl and ammonul, is used for treatment as well. Hyperammonemia is treated with hemodialysis; intravenous arginine, sodium benzoate, and sodium phenylacetate.
Cervical cancer was the most frequent HPV-associated cancer with on average 292 cases per year (74% of the female total, and 54% of the overall total of HPV-associated cancers). [197] A study of 996 cervical cytology samples in an Irish urban female, opportunistically screened population, found an overall HPV prevalence of 19.8%, HPV 16 at 20% ...