Cervical Cancer Screening: Updated Guidelines from the American Cancer Society
Am Fam Physician. 2021 Sep ;104(2):314-315.
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Key Points for Practice
• Primary HPV testing alone every five years is more sensitive for dysplasia than cytology and more specific than cotesting with HPV testing and cytology.
• Primary HPV testing every five years from 25 to 65 years of age reduces cancers and cancer deaths as much as cytology from 21 to 30 years of age and cotesting from 30 to 65 years of age while also reducing pelvic examination burden by about one-half
• Cervical cancer screening can be discontinued after 65 years of age in women at low risk due to previous negative screening.
From the AFP Editors
Cervical cancer screening programs are successful, decreasing cancer incidence dramatically since the 1950s to just less than 14,000 cases in 2020. Yet, more than 4,000 patients die annually from cervical cancer, with racial and socioeconomic disparities continuing to contribute to this number. The American Cancer Society (ACS) has released new guidelines for cervical cancer screening.
Best Screening Test
The primary goal of screening is to prevent cervical cancer by detecting treatable abnormalities and precancerous lesions. Early detection of invasive cervical cancer is a secondary goal.
In 2018, the U.S. Preventive Services Task Force (USPSTF) recommended primary human papillomavirus (HPV) testing without cytology as an option for cervical cancer screening. Both primary HPV tests are approved for patients 25 years and older. Primary HPV testing is more sensitive and has a higher long-term negative predictive value than cytology. In vaccinated patients, abnormal cytology findings are primarily caused by HPV types with low cancer risk. Cotesting with cytology and HPV testing increases false-positive results compared with primary HPV testing with minimal effect on cervical cancer detection.
In a major shift from their 2012 guideline, the ACS recommends that patients with a cervix undergo primary HPV testing every five years, without cytology, beginning at 25 years of age and, for most patients, stopping at 65 years of age. The recommendation not to initiate screening until age 25 is based on several factors. Less than 1% of cervical cancers are diagnosed in patients younger than 25 years, and early screening does not prevent these cancers. Many abnormal findings in patients 21 to 24 years of age would regress without intervention because HPV infections in this group are commonly transient. Large observational studies suggest that screening younger patients offers little benefit in reducing cervical cancer, and treatment can increase risks of preterm birth.
Primary HPV testing is not yet available in many locations. Until it is an option, screening can be performed through cotesting every five years or cytology alone every three years.
Although vaccination reduces risks of positive HPV test results and precancerous lesions, evidence is insufficient to modify screening recommendations for vaccinated patients.
When to Stop Cervical Cancer Screening
Although one in five cervical cancer deaths occurs in patients older than 65 years, most were diagnosed at a younger age or had insufficient screening. Testing beyond this age in previously screened patients adds little benefit with a cost of more colposcopies. Cervical cancer screening is no longer required in low-risk patients older than 65 years who have not been diagnosed with grade 2 or greater cervical intraepithelial neoplasia within the past 25 years and who have had negative screening results for the past 10 years using any recommended interval.
Benefits and Risks
Based on models, there will be similar mortality and fewer cancers with five-year primary HPV screening compared with screening using previous recommendations as shown in Table 1. The new recommendations reduce
Coverage of guidelines from other organizations does not imply endorsement by AFP or the AAFP.
This series is coordinated by Michael J. Arnold, MD, contributing editor.
A collection of Practice Guidelines published in AFP is available at https://www.aafp.org/afp/practguide.
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