Cervical Cancer Treatment (Professional)
General Information About Cervical Cancer
Incidence and Mortality
Estimated new cases and deaths from cervical (uterine cervix) cancer in the United States in 2011:
The prognosis for patients with cervical cancer is markedly affected by the extent of disease at the time of diagnosis. A vast majority (>90%) of these cases can and should be detected early through the use of the Pap test and human papillomavirus (HPV) testing; however, the current death rate is far higher than it should be, which reflects that, even today, the Pap test and HPV testing are not done on approximately 33% of eligible women. Clinical stage, however, as a prognostic factor must be supplemented by several gross and microscopic pathologic findings in surgically treated patients. These include: volume and grade of tumor, histologic type, lymphatic spread, and vascular invasion.
In a large surgicopathologic staging study of patients with clinical stage IB disease reported by the Gynecologic Oncology Group (GOG) (GOG-49), the factors that predicted most prominently for lymph node metastases and a decrease in disease-free survival were capillary-lymphatic space involvement by tumor, increasing tumor size, and increasing depth of stromal invasion, with the latter being most important and reproducible.[3,4] In a study of 1,028 patients treated with radical surgery, survival rates correlated more consistently with tumor volume (as determined by precise volumetry of the tumor) than clinical or histologic stage.
A multivariate analysis of prognostic variables in 626 patients with locally advanced disease (primarily stages II, III, and IV) studied by the GOG identified several variables that were significant for progression-free interval and survival:
The study confirmed the overriding importance of positive periaortic nodes and suggested further evaluation of these nodes in locally advanced cervical cancer. The status of the pelvic nodes was important only if the periaortic nodes were negative. This was also true for tumor size.
In a large series of cervical cancer patients treated by radiation therapy, the incidence of distant metastases (most frequently to lung, abdominal cavity, liver, and gastrointestinal tract) was shown to increase as the stage of disease increased, from 3% in stage IA to 75% in stage IVA. A multivariate analysis of factors influencing the incidence of distant metastases showed stage, endometrial extension of tumor, and pelvic tumor control to be significant indicators of distant dissemination.
GOG studies have indicated that prognostic factors vary whether clinical or surgical staging are utilized, and with treatment. Delay in radiation delivery completion is associated with poorer progression-free survival when clinical staging is used. It is unclear whether stage, tumor grade, race, and age hold up as prognostic factors in studies utilizing chemoradiation.
Invasive Carcinomas of the Uterine Cervix
Whether adenocarcinoma of the cervix carries a significantly worse prognosis than squamous cell carcinoma of the cervix remains controversial. Reports conflict about the effect of adenosquamous cell type on outcome.[10,11] One report showed that approximately 25% of apparent squamous tumors have demonstrable mucin production and behave more aggressively than their pure squamous counterparts, suggesting that any adenomatous differentiation may confer a negative prognosis. The decreased survival is mainly the result of more advanced stage and nodal involvement rather than cell type as an independent variable. Women with human immunodeficiency virus have more aggressive and advanced disease and a poorer prognosis. A study of patients with known invasive squamous carcinoma of the cervix found that overexpression of the C-myc oncogene was associated with a poorer prognosis. The number of cells in S phase may also have prognostic significance in early cervical carcinoma. HPV type 18 DNA has been found to be an independent adverse molecular prognostic factor. Two studies have shown a worse outcome when identified in cervical cancers of patients undergoing radical hysterectomy and pelvic lymphadenectomy.[16,17]
Human Papillomavirus Infection and Cervical Cancer
Molecular techniques for the identification of HPV DNA are highly sensitive and specific. More than 6 million women in the United States are estimated to have HPV infection, and proper interpretation of these data is important. Epidemiologic studies convincingly demonstrate that the major risk factor for development of preinvasive or invasive carcinoma of the cervix is HPV infection, which far outweighs other known risk factors such as high parity, increasing number of sexual partners, young age at first intercourse, low socioeconomic status, and positive smoking history.[18,19] Some patients with HPV infection appear to be at minimal increased risk for development of cervical preinvasive and invasive malignancies, while others appear to be at significant risk and are candidates for intensive screening programs and/or early intervention.
HPV DNA tests are unlikely to separate patients with low-grade squamous intraepithelial lesions into those who do and those who do not need further evaluation. A study of 642 women found that 83% had one or more tumorigenic HPV types when cervical cytologic specimens were assayed by a sensitive (hybrid capture) technique. The authors of the study and of an accompanying editorial concluded that using HPV DNA testing in this setting does not add sufficient information to justify its cost. HPV DNA testing has proven useful in triaging patients with atypical squamous cells of undetermined significance to colposcopy and has been integrated into current screening guidelines.[20,21,22] Patients with an abnormal cytology of a high-risk type (Bethesda classification) should be thoroughly evaluated with colposcopy and biopsy.
Other studies show patients with low-risk cytology and high-risk HPV infection with types 16, 18, and 31 are more likely to have cervical intraepithelial neoplasia (CIN) or microinvasive histopathology on biopsy.[19,23,24,25] One method has also shown that integration of HPV types 16 and 18 into the genome, leading to transcription of viral and cellular messages, may predict patients who are at greater risk for high-grade dysplasia and invasive cancer. Studies suggest that acute infection with HPV types 16 and 18 conferred an 11- to 16.9-fold risk of rapid development of high-grade CIN, [19,27] but there are conflicting data requiring further evaluation before any recommendations may be made. Patients with low-risk cytology and low-risk HPV types have not been followed long enough to ascertain their risk. At present, studies are ongoing to determine how HPV typing can be used to help stratify women into follow-up and treatment groups. HPV typing may prove useful, particularly in patients with low-grade cytology or cytology of unclear abnormality. At present, how therapy and follow-up should be altered with low- versus high-risk HPV type has not been established.
Other PDQ summaries containing information related to cervical cancer include the following:
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