Current Guidelines and Research on Cervical Screening for Older Women

Overview of Cervical Screening Recommendations

In the United States, current guidelines advocate for cervical screening up to the age of 65. However, researchers are exploring the effectiveness of such screenings in older women, particularly given the persistent high rates of cervical cancer in this demographic. Although countries with established cervical screening practices have reported significant declines in cervical cancer rates among women aged 30 to 60, similar progress has not been observed in older women.

Cervical Cancer Rates in Older Women

Evidence indicates that women over 60 are diagnosed with cervical cancer more frequently and at advanced stages compared to their younger counterparts. This discrepancy raises questions about the appropriateness of screening for older women and when to cease screening practices.

Recent Research Findings

A recent study published in PLOS Medicine aimed to clarify when cervical cancer screening should be discontinued and to assess the effectiveness of continued screening for women over 60. Researchers, led by Wang and colleagues, utilized data from a national cervical screening registry, focusing on a cohort of half a million Swedish women born between January 1, 1919, and December 31, 1945. This selection ensured that participants were aged 51 or younger in 1970 and 66 or older by the end of 2011.

Categorization of Screening Histories

The researchers categorized the screening histories of women aged 51-60 into five groups:
1. Adequately screened with normal results
2. Inadequately screened with normal results
3. Unscreened
4. Low-grade abnormality
5. High-grade abnormality

The primary focus was on each woman’s first Pap test record between ages 61-65, with the main outcome being the incidence of cervical cancer.

Key Findings from the Study

Among the study participants, 63% of women aged 61-65 had not been screened. Those who did undergo screening tended to have higher educational levels, with 60% of the study population adequately screened and receiving normal results during their 50s. The study identified 868 cases of cervical cancer in women aged 61-80, predominantly among those who were not screened between the ages of 61-65.

The results indicated that women screened at ages 61-65 had lower rates of cervical cancer between 61-80 compared to those who were not screened. However, the benefits varied based on their screening history in their 50s. Cervical cancer occurrence in older age appears to be less likely for women who had normal screening results in their 50s, likely due to reduced exposure to HPV after reproductive age. The effectiveness of cervical screening after 60 diminishes, as the factors leading to cervical cancer are less prevalent.

Conclusions and Recommendations

The findings suggest that women who are unscreened or have abnormal screening results are at a heightened risk of developing cervical cancer, and subsequent screenings may mitigate this risk. The study advocates for continued screening for women over 60, particularly those with abnormal results, while indicating that women screened in their 50s with normal results show no significant risk of developing cervical cancer.

Researchers recommend that cervical screening decisions should consider available resources, and they believe their findings can inform future studies and cervical screening programs.

References

Wang J, Andrae B, Sundström K, Ploner A, Ström P, Elfström KM, et al. (2017) Effectiveness of cervical screening after age 60 years according to screening history: Nationwide cohort study in Sweden. PLoS Med 14(10): e1002414. https://doi.org/10.1371/journal.pmed.1002414