title: Hospital and surgeon procedure volume as predictors of outcome following rectal cancer resection.
abstract: OBJECTIVE
  To compare surgeon and hospital procedure volume as predictors of outcomes for patients with rectal cancer.
  
  
  BACKGROUND
  Although a "volume-outcome" relationship exists for several major cancer operations, the impact of procedure volume on outcomes following rectal cancer surgery remains uncertain, and it has not been determined whether hospital or surgeon volume is a more important predictor of outcomes.
  
  
  METHODS
  A retrospective population-based cohort study utilizing the Surveillance, Epidemiology and End Results (SEER)-Medicare linked database identified 2,815 rectal cancer patients aged 65 and older who had surgery for a primary tumor diagnosed in 1992-1996 in a SEER area. Hospital- and surgeon-specific procedure volume was ascertained based on the number of claims submitted over the 5-year study period. Outcome measures were mortality at 30 days and 2 years, overall survival, and the rate of abdominoperineal resections. Age, sex, race, comorbid illness, cancer stage, and socioeconomic status were used to adjust for differences in case mix.
  
  
  RESULTS
  Neither hospital- nor surgeon-specific procedure volume was significantly associated with 30-day postoperative mortality or rates of rectal sphincter-sparing operations. Although an association between hospital volume and mortality at 2 years was evident, this finding was no longer significant once surgeon-specific volume was controlled for. In contrast, surgeon-specific volume was associated with 2-year mortality and remained an important predictor even after adjustment for hospital volume. Surgeon volume was also better than hospital procedure volume at predicting long-term survival.
  
  
  CONCLUSIONS
  Surgeon-specific experience as measured by procedure volume can have a significant impact on survival for patients with rectal cancer.
authors.affiliation: Health Outcomes Research Group, Department of Epidemiology and Biostatistics, Department of Medicine, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA. schragd@mskcc.org
authors.forename: Deborah
authors.initials: D
authors.lastname: Schrag
authors.forename: Katherine S
authors.initials: KS
authors.lastname: Panageas
authors.forename: Elyn
authors.initials: E
authors.lastname: Riedel
authors.forename: Laura D
authors.initials: LD
authors.lastname: Cramer
authors.forename: Jose G
authors.initials: JG
authors.lastname: Guillem
authors.forename: Peter B
authors.initials: PB
authors.lastname: Bach
authors.forename: Colin B
authors.initials: CB
authors.lastname: Begg
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D013505:Digestive System Surgical Procedures / Q000401:mortality / Q000706:statistics & numerical data*; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D017063:Outcome Assessment, Health Care; D012004:Rectal Neoplasms / Q000401:mortality / Q000601:surgery*; D012189:Retrospective Studies; D018426:SEER Program; D015996:Survival Rate