title: Ovarian cancer in Western Australia (1982-1998): trends in surgical intervention and relative survival.
abstract: OBJECTIVE
  We aimed to review the utilisation and trends in surgical procedures for the primary management of ovarian cancer and the survival outcomes of patients surgically treated in Western Australia.
  
  
  METHODS
  The population-based Western Australia Data Linkage System was used to link hospital morbidity and mortality data for all women diagnosed with malignant primary ovarian cancer in the State Cancer Registry in the period 1982-1998. Poisson regression was used to analyse trends in surgical procedure rates. Logistic regression examined the likelihood of having a surgical procedure in the periods 1988-1993 and 1994-1998 compared with 1982-1987. Relative survival was used to adjust survival estimates for other causes of death occurring in the general female population.
  
  
  RESULTS
  There were 1,126 women who underwent a primary surgical procedure for ovarian cancer in Western Australia in the period 1982-1998. Women were more likely to undergo surgery in 1994-1998 (87.8%) compared with 1988-1993 (76.8%), but there was no difference when compared to 1982-1987 (89.2%) (P = 0.62). The likelihood of using specific surgical procedures to treat ovarian cancer increased for all but total abdominal hysterectomy. Bilateral salpingo-oophorectomy was 3.7 times more likely to be performed and omentectomy 5 times more likely to be performed in 1994-1998 compared with 1982-1987. The median length of hospital stay decreased from 15 to 12 days and emergency admissions decreased from 26.5 to 15.4% over the three time periods. Thirty-two percent of women were readmitted within 30 days of separation from their primary surgery, 23% of which were for the same-day treatment with either chemotherapy or radiotherapy. A 15% increase in relative survival was observed between the periods 1982-1997 (38.8%) and 1994-1998 (53.5%).Conclusion.
  
  
  CONCLUSIONS
  Surgery remains a cornerstone in the primary management of ovarian cancer. There have been dramatic shifts in surgical practice in Western Australia, with more women undergoing certain surgical procedures today than they were 20 years ago. Coupling the increasing surgical trends are improved outcomes. Fewer women are presenting as an emergency, the length of hospital stay has been reduced, and survival outcomes have shown a significant improvement.
authors.affiliation: Centre for Health Services Research, School of Population Health, The University of Western Australia, Nedlands-, Western Australia, Australia. claurvic@dph.uwa.edu.au
authors.forename: Crystal L
authors.initials: CL
authors.lastname: Laurvick
authors.forename: James B
authors.initials: JB
authors.lastname: Semmens
authors.forename: Yee C
authors.initials: YC
authors.lastname: Leung
authors.forename: C D'Arcy J
authors.initials: CD
authors.lastname: Holman
mesh_terms: D000368:Aged; D005260:Female; D013509:Gynecologic Surgical Procedures / Q000706:statistics & numerical data / Q000639:trends; D006801:Humans; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000401:mortality / Q000601:surgery*; D015996:Survival Rate; D016896:Treatment Outcome; D014904:Western Australia / Q000453:epidemiology