title: Metachronous peritoneal carcinomatosis after curative treatment of colorectal cancer.
abstract: BACKGROUND
  Population-based data on metachronous peritoneal carcinomatosis (PC) after curative resection of colorectal origin are scarce. The aim of this study was to investigate the incidence of and risk factors for developing metachronous PC from colorectal cancer as well as survival since diagnosis of PC.
  
  
  METHODS
  Data on metachronous metastases were collected between 2010 and 2011 for all patients diagnosed with M0 colorectal cancer between 2003 and 2008 in the Dutch Eindhoven Cancer Registry. Median follow-up was 5.0 years. Survival was defined as time from metastases diagnosis to death.
  
  
  RESULTS
  Of the 5671 colorectal cancer patients, 1042 (18%) were diagnosed with metachronous metastases of whom 197 (19%) developed metachronous PC. The peritoneal surface was the only site of metastasis in 81 (41%) patients while 116 (59%) patients were diagnosed with both PC and metastases elsewhere. Median survival after diagnosis of PC was 6 months compared to 15 months for patients with distant metastases in other organs. Patients with an advanced primary tumour stage, positive lymph nodes at initial diagnosis, primary mucinous adenocarcinoma, positive resection margin and a primary tumour located in the colon were at increased risk of developing metachronous PC.
  
  
  CONCLUSIONS
  Of the colorectal cancer patients who developed metachronous metastases, approximately one fifth is diagnosed with PC. Prognosis of these patients is poor with a median survival of 6 months after diagnosis. Identifying patients at high risk for developing metachronous PC is important as it may contribute to more accurate patient information, tailor-made follow-up schemes, and more adequate treatment.
authors.affiliation: Eindhoven Cancer Registry, Comprehensive Cancer Centre South (IKZ), P.O. Box 231, 5600 AE Eindhoven, The Netherlands. Electronic address: research@ikz.nl.
authors.forename: Y R B M
authors.initials: YR
authors.lastname: van Gestel
authors.affiliation: Eindhoven Cancer Registry, Comprehensive Cancer Centre South (IKZ), P.O. Box 231, 5600 AE Eindhoven, The Netherlands; Department of Surgery, Catharina Hospital, P.O. Box 1350, 5602 ZA Eindhoven, The Netherlands.
authors.forename: I
authors.initials: I
authors.lastname: Thomassen
authors.affiliation: Eindhoven Cancer Registry, Comprehensive Cancer Centre South (IKZ), P.O. Box 231, 5600 AE Eindhoven, The Netherlands; Department of Public Health, Erasmus MC University Medical Centre, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands.
authors.forename: V E P P
authors.initials: VE
authors.lastname: Lemmens
authors.affiliation: Department of Internal Medicine, Jeroen Bosch Hospital, P.O. Box 90153, 5200 ME 's-Hertogenbosch, The Netherlands.
authors.forename: J F M
authors.initials: JF
authors.lastname: Pruijt
authors.affiliation: PHARMO Institute for Drug Outcome Research, P.O. Box 85222, 3508 AE Utrecht, The Netherlands.
authors.forename: M P P
authors.initials: MP
authors.lastname: van Herk-Sukel
authors.affiliation: Department of Surgery, Catharina Hospital, P.O. Box 1350, 5602 ZA Eindhoven, The Netherlands; Research Institute Growth & Development, P.O. Box 616, Maastricht University Medical Centre, 6200 MD, The Netherlands.
authors.forename: H J T
authors.initials: HJ
authors.lastname: Rutten
authors.affiliation: Department of Internal Medicine, Catharina Hospital, P.O. Box 1350, 5602 ZA Eindhoven, The Netherlands.
authors.forename: G J
authors.initials: GJ
authors.lastname: Creemers
authors.affiliation: Department of Surgery, Catharina Hospital, P.O. Box 1350, 5602 ZA Eindhoven, The Netherlands.
authors.forename: I H J T
authors.initials: IH
authors.lastname: de Hingh
mesh_terms: D002288:Adenocarcinoma, Mucinous; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000556:secondary / Q000601:surgery*; D015179:Colorectal Neoplasms / Q000401:mortality / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D016609:Neoplasms, Second Primary / Q000175:diagnosis* / Q000453:epidemiology* / Q000601:surgery; D009426:Netherlands / Q000453:epidemiology; D010534:Peritoneal Neoplasms / Q000175:diagnosis* / Q000453:epidemiology* / Q000209:etiology; D011379:Prognosis; D012042:Registries; D012307:Risk Factors; D016896:Treatment Outcome
keywords: Colorectal cancer; Metachronous metastases; Peritoneal carcinomatosis; Risk factors