title: Diffusion of good practices of care and decline of the association with case volume: the example of breast conserving surgery.
abstract: BACKGROUND
  Several previous studies conducted on cancer registry data and hospital discharge records (HDR) have found an association between hospital volume and the recourse to breast conserving surgery (BCS) for breast cancer. The aim of the current study is to depict concurrent time trends in the recourse to BCS and its association with hospital volume.
  
  
  METHODS
  Admissions of breast cancer patients for BCS or mastectomy in the period 2000-2004 were identified from the discharge database of the Veneto Region (Italy). The role of procedural volume (low < 50, medium 50-100, high > 100 breast cancer surgeries/year), and of individual risk factors obtainable from HDR was assessed through a hierarchical log-binomial regression.
  
  
  RESULTS
  Overall, the recourse to BCS was higher in medium (risk ratio = 1.12, 95% confidence interval 1.07-1.18) and high-volume (1.09, 1.03-1.14) compared to low-volume hospitals. The proportion of patients treated in low-volume hospitals dropped from 22% to 12%, with a concurrent increase in the activity of medium-volume providers. The increase over time in breast conservation (globally from 56% to 67%) was steeper in the categories of low- and medium-volume hospitals with respect to high caseload.
  
  
  CONCLUSIONS
  The growth in the recourse to BCS was accompanied by a decline of the association with hospital volume; larger centers probably acted as early adopters of breast conservation strategies that subsequently spread to smaller providers.
authors.affiliation: SER-Epidemiological Department, Veneto Region, Via Ospedale 18-31033 Castelfranco Veneto (TV), Italy. ugo.fedeli@ulssasolo.ven.it
authors.forename: Ugo
authors.initials: U
authors.lastname: Fedeli
authors.forename: Natalia
authors.initials: N
authors.lastname: Alba
authors.forename: Elena
authors.initials: E
authors.lastname: Schievano
authors.forename: Cristiana
authors.initials: C
authors.lastname: Visentin
authors.forename: Rosalba
authors.initials: R
authors.lastname: Rosato
authors.forename: Manuel
authors.initials: M
authors.lastname: Zorzi
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Ruscitti
authors.forename: Paolo
authors.initials: P
authors.lastname: Spolaore
mesh_terms: D019985:Benchmarking; D001943:Breast Neoplasms / Q000601:surgery*; D003657:Decision Making; D004059:Diffusion of Innovation; D005260:Female; D006801:Humans; D007558:Italy; D016462:Mammaplasty / Q000706:statistics & numerical data; D015412:Mastectomy, Segmental / Q000706:statistics & numerical data*; D017060:Patient Satisfaction; D012044:Regression Analysis; D018570:Risk Assessment; D012307:Risk Factors; D013503:Surgery Department, Hospital / Q000706:statistics & numerical data*; D014600:Utilization Review / Q000706:statistics & numerical data / Q000639:trends*