TOPLINE:
Among women with cervical intraepithelial neoplasia grade 2 (CIN2), vaccination against human papillomavirus (HPV) before age 20 is associated with lower odds of progression.
METHODOLOGY:
- Researchers analyzed data from 7904 women in Denmark who were undergoing active surveillance for CIN2 between 2007 and 2020.
- CIN2 lesions on their own. Removing them can increase the risk for during subsequent pregnancies, the researchers noted.
- Nearly half of the women had received at least one dose of an HPV vaccine at least 1 year before the diagnosis of cervical dysplasia.
TAKEAWAY:
- During 28 months of follow-up, the risk for progression was 22.9% for women vaccinated before age 15, 31.5% for women vaccinated between ages 15 and 20, and 37.6% for women who were not vaccinated.
- Women vaccinated before age 15 had a 35% lower risk for progression than unvaccinated women, after adjusting for cytology, income, and education (adjusted relative risk, 0.65; 95% CI, 0.57-0.75).
- Cervical cancer developed in 0.37% of the unvaccinated women and 0.13% of the vaccinated women.
- All cases of cervical cancer in the vaccinated group occurred in women who received the vaccine after age 20.
IN PRACTICE:
“These findings suggest that HPV vaccination status may be used to identify women at higher risk for progression, thereby enabling risk stratification at the time of CIN2 diagnosis,” the researchers wrote.
SOURCE:
Louise Krog, BscMed, with Aarhus University, Aarhus, Denmark, was the corresponding author of the study. The research was published online in the American Journal of Obstetrics & Gynecology.
LIMITATIONS:
The study authors had limited information about potential confounders such as smoking, immunosuppressive conditions, and the age at which patients became sexually active.
DISCLOSURES:
The study was funded by the Danish Cancer Society, the Carpenter Axel Kastrup-Nielsen’s Memorial Fund, and the Dagmar Marshall’s Fund. Co-authors disclosed ties to AstraZeneca, Roche, and Hologic.
A version of this article appeared on Medscape.com.