COVID-19 Severity and Waning Immunity After up to 4 mRNA Vaccine Doses in 73 608 Patients With Cancer and 621 475 Matched Controls in Singapore
Tan W, Tan J, Lim J, Tan R, Bin Lee A, Leong F, Lee S, Chai L, Tan T, Bin Abdul Malek M, Ong B, Lye D, Chiew C, Chng W, Lim S, Bharwani L, Tan I, Sundar R, Tan K. COVID-19 Severity and Waning Immunity After up to 4 mRNA Vaccine Doses in 73 608 Patients With Cancer and 621 475 Matched Controls in Singapore. JAMA Oncology 2023, 9: 1221-1229. PMID: 37440245, PMCID: PMC10346511, DOI: 10.1001/jamaoncol.2023.2271.Peer-Reviewed Original ResearchConceptsIncidence rate ratiosCancer survivorsVaccine doseSevere diseaseCohort studyTreated patientsProspective multicenter observational cohort studyCompeting-risk regression analysisMulticenter observational cohort studyMatched controlsVaccine efficacyVaccine effectivenessRisk of poor outcomesWaning of vaccine effectivenessSevere COVID-19 disease outcomesMRNA vaccine doseRisk of deathObservational cohort studyMRNA-based vaccinesSocioeconomic statusSARS-CoV-2 DeltaRate ratiosCOVID-19 hospitalizationIncidence rateOmicron wave