Effects of different-valent vaccines against human papillomavirus (HPV) to prevent persistent HPV16/18 infections and CIN2+ in women: A systematic review and network meta-analysis

To evaluate the efficacy of 2-valent, 4-valent and 9-valent HPV vaccination in preventing persistent HPV infections and cervical intraepithelial neoplasia grade 2 or higher (CIN2+) lesions among women with different infection statuses at baseline.OBJECTIVESTo evaluate the efficacy of 2-valent, 4-valent and 9-valent HPV vaccination in preventing persistent HPV infections and cervical intraepithelial neoplasia grade 2 or higher (CIN2+) lesions among women with different infection statuses at baseline.PubMed, Web of Science, Cochrane, Embase and ClinicalTrials.gov were searched from their inception to March 2024. Randomized controlled trials (RCTs) and post hoc analyses of RCTs reporting the risk of persistent HPV infections and CIN2+ among vaccinated women were included. Odds ratios (ORs) with 95% confidence intervals (CIs) were calculated to summarize the intervention effects.METHODSPubMed, Web of Science, Cochrane, Embase and ClinicalTrials.gov were searched from their inception to March 2024. Randomized controlled trials (RCTs) and post hoc analyses of RCTs reporting the risk of persistent HPV infections and CIN2+ among vaccinated women were included. Odds ratios (ORs) with 95% confidence intervals (CIs) were calculated to summarize the intervention effects.Eighteen RCTs and one post hoc analysis of RCTs were included. In the according-to-protocol (ATP) cohorts, the 4-valent vaccine was the most effective against HPV16/18-related persistent infections and CIN2+ (6-month persistent infections (6mPIs): OR 0.05, 95% CI [0.02, 0.15]; 12-month persistent infections (12mPIs): OR 0.02, 95% CI [0.00, 0.18]; CIN2+: OR 0.03 95% CI [0.01, 0.17]). For the total vaccination cohorts (TVCs), the 2-valent vaccine was most effective against HPV16/18-related 12mPIs and CIN2+ (12mPIs: OR 0.15, 95% CI [0.04, 0.63]; CIN2+: OR 0.52 95% CI [0.32, 0.87]), whereas the 4-valent vaccine was most effective against HPV16/18-related 6mPIs (OR 0.08, 95% CI [0.02, 0.28]).RESULTSEighteen RCTs and one post hoc analysis of RCTs were included. In the according-to-protocol (ATP) cohorts, the 4-valent vaccine was the most effective against HPV16/18-related persistent infections and CIN2+ (6-month persistent infections (6mPIs): OR 0.05, 95% CI [0.02, 0.15]; 12-month persistent infections (12mPIs): OR 0.02, 95% CI [0.00, 0.18]; CIN2+: OR 0.03 95% CI [0.01, 0.17]). For the total vaccination cohorts (TVCs), the 2-valent vaccine was most effective against HPV16/18-related 12mPIs and CIN2+ (12mPIs: