title: [Survival, mortality and quality of life after pylorus-preserving or classical Whipple operation. A systematic review with meta-analysis].
abstract: BACKGROUND
  Two surgical procedures are mainly performed for the treatment of pancreatic head cancer and periampullary carcinoma: the classical Whipple operation and the pylorus-preserving Whipple operation.
  
  
  METHODS
  This manuscript represents an extension of a systematic review and meta-analysis previously published in the Annals of Surgery. A systematic literature search was performed in MEDLINE, EMBASE and the Cochrane Library (central) to identify randomized controlled trials (RCTs) and observational studies. A meta-analysis based on a random-effects model was performed for the hazard ratios (HR) of survival and the odds ratios (OR) of postoperative mortality. The results of the different studies on quality of life (QoL) could not be summarized quantitatively in a meta-analysis and were therefore summarized qualitatively. Subgroup analyses were performed by study type, RCTs, prospective cohort studies (PSs), retrospective cohort studies (RSs), study quality and tumor localization (pancreatic head cancer versus periampullary carcinoma).
  
  
  RESULTS
  The systematic literature search retrieved 4,503 studies of which 4,460 did not fulfill the inclusion criteria. The remaining 43 studies (6 RCTs, 12 PSs and 25 RSs) representing 3,893 patients were finally included in the review. There was neither a significant survival difference for patients with pancreatic head cancer in the pooled estimate of the RCTs (HR 0.80; 95% CI 0.53-1.22; p=0.16) nor in the pooled estimate of the PSs (HR 0.84; 95% CI 0.7-1.0; p=0.95) or the RSs (HR 0.84; 95% CI 0.7-1.01; p=0.21). Survival of patients with periampullary carcinoma was not significantly different in the RCTs (HR 1.02; 95% CI 0.49-2.13; p=0.3), the PSs (HR 1.26; 95% CI 0.46-3.42; p=0.65) or the RSs (HR 0.86; 95% CI 0.6-1.24; p=0.33). Postoperative mortality was not significantly different after both types of operations (RCTs: HR 0.49; 95% CI 0.17-1.4; p=0.18; PSs: HR 0.63; 95% CI 0.34-1.18; p=0.15; RSs: HR 0.7; 95% CI 0.37-1.31; p=0.27). QoL was reported as either the same in both groups or in favor of the pylorus-preserving Whipple operation.
  
  
  CONCLUSIONS
  Mortality, survival and QoL were not significantly different between the classical Whipple and the pylorus-preserving Whipple operations. Given the poor quality of the underlying trials a pragmatic RCT is recommended to prove the findings of this systematic review.
authors.affiliation: Studienzentrum der Deutschen Gesellschaft für Chirurgie, Heidelberg.
authors.forename: C
authors.initials: C
authors.lastname: Fitzmaurice
authors.forename: C M
authors.initials: CM
authors.lastname: Seiler
authors.forename: M W
authors.initials: MW
authors.lastname: Büchler
authors.forename: M K
authors.initials: MK
authors.lastname: Diener
mesh_terms: D003138:Common Bile Duct Neoplasms / Q000601:surgery*; D006801:Humans; D010190:Pancreatic Neoplasms / Q000601:surgery*; D016577:Pancreaticoduodenectomy / Q000379:methods* / Q000401:mortality / Q000523:psychology; D011183:Postoperative Complications / Q000209:etiology* / Q000401:mortality* / Q000523:psychology; D011706:Pyloric Antrum / Q000601:surgery*; D011788:Quality of Life / Q000523:psychology*; D016032:Randomized Controlled Trials as Topic; D015996:Survival Rate