title: Influenza immunization in older adults with and without cancer.
abstract: OBJECTIVE
  To compare the likelihood of receiving an influenza immunization in older adults before and immediately after a cancer diagnosis occurring in 2001 and for the same time periods with older adults not diagnosed with cancer.
  
  
  METHODS
  Retrospective analysis comparing influenza immunization rates of Medicare beneficiaries with and without a diagnosis of cancer.
  
  
  METHODS
  Surveillance, Epidemiology, and End Results-Medicare Data.
  
  
  METHODS
  Propensity score matching matched a group of 35,229 persons without cancer with 35,257 individuals diagnosed with cancer in 2001.
  
  
  METHODS
  Receipt of influenza vaccination based upon Medicare Claims Data.
  
  
  RESULTS
  A difference-of-difference analysis revealed that influenza immunization rates increased over time for persons diagnosed with cancer (46.8% before to 50.8% after cancer diagnosis), but the increase was greater in beneficiaries without a cancer diagnosis (42.6% to 79.7%) (P < .001; 95% confidence interval = 0.320-0.324). Logistic regression analysis revealed that individuals without a cancer diagnosis were 7.25 times as likely to receive an influenza immunization.
  
  
  CONCLUSIONS
  Older adults who have been recently diagnosed with cancer receive influenza immunizations at much lower rates than older adults who have not been diagnosed with cancer despite interaction with healthcare providers. Opportunities exist to improve influenza immunization in this population, who are susceptible to influenza because of compromised immune systems.
authors.affiliation: Division of Gerontology, Geriatrics, and Palliative Care, University of Alabama at Birmingham, Birmingham, Alabama, USA. jlocher@uab.edu
authors.forename: Julie L
authors.initials: JL
authors.lastname: Locher
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Rucks
authors.forename: Sharon A
authors.initials: SA
authors.lastname: Spencer
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Pettaway
authors.forename: Meredith L
authors.initials: ML
authors.lastname: Kilgore
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007114:Immunization / Q000706:statistics & numerical data*; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control*; D008297:Male; D009369:Neoplasms / Q000628:therapy; D012189:Retrospective Studies
chemical_list: D007252:Influenza Vaccines