title: Clinical impact of different detection methods for disseminated tumor cells in bone marrow of patients undergoing surgical resection of colorectal liver metastases: a prospective follow-up study.
abstract: BACKGROUND
  Large number of patients with colorectal liver metastasis show recurrent disease after curative surgical resection. Identification of these high-risk patients may guide therapeutic strategies. The aim of this study was to evaluate whether the presence of disseminated tumor cells in bone marrow from patients undergoing surgical resection of colorectal liver metastases can predict clinical outcome.
  
  
  METHODS
  Sixty patients with colorectal liver metastases were planned for a curative resection between 2001 and 2007. All patients underwent bone marrow aspiration before surgery. Detection of tumor cells was performed using immunocytochemical staining for cytokeratin (CK-ICC) combined with automated microscopy or indirectly using reverse transcription-polymerase chain reaction (RT-PCR).
  
  
  RESULTS
  Disseminated tumor cells were found in 15 of the 46 patients (33%) using CK-ICC and in 9 of 44 of the patients (20%) using RT-PCR. Patients with negative results for RT-PCR had a significant better disease-free survival after resection of their liver metastases (p = 0.02). This group also showed significant better overall survival (p = 0.002). CK-ICC did not predict a worse clinical outcome.
  
  
  CONCLUSIONS
  The presence of disseminated tumor cells in bone marrow detected using RT-PCR did predict a worse clinical outcome. The presence of cells detected with CK-ICC did not correlate with poor prognosis.
authors.affiliation: Department of Surgery, Leiden University Medical Center, Leiden, the Netherlands. f.j.vogelaar@lumc.nl
authors.forename: F Jeroen
authors.initials: FJ
authors.lastname: Vogelaar
authors.forename: Wilma E
authors.initials: WE
authors.lastname: Mesker
authors.forename: Arjen M
authors.initials: AM
authors.lastname: Rijken
authors.forename: Gaby W
authors.initials: GW
authors.lastname: van Pelt
authors.forename: Antonia M
authors.initials: AM
authors.lastname: van Leeuwen
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Tanke
authors.forename: Rob A
authors.initials: RA
authors.lastname: Tollenaar
authors.forename: Gerrit J
authors.initials: GJ
authors.lastname: Liefers
mesh_terms: D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis* / Q000235:genetics; D001707:Biopsy, Needle; D001853:Bone Marrow / Q000737:chemistry / Q000473:pathology*; D001856:Bone Marrow Examination / Q000379:methods*; D017024:Chemotherapy, Adjuvant; D015179:Colorectal Neoplasms / Q000473:pathology*; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007150:Immunohistochemistry; D053208:Kaplan-Meier Estimate; D007633:Keratins / Q000032:analysis* / Q000235:genetics; D008113:Liver Neoplasms / Q000235:genetics / Q000401:mortality / Q000556:secondary* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D020360:Neoadjuvant Therapy; D009360:Neoplastic Cells, Circulating / Q000737:chemistry / Q000473:pathology*; D011237:Predictive Value of Tests; D016016:Proportional Hazards Models; D011446:Prospective Studies; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor; D007633:Keratins
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