title: Value of carcinoembryonic antigen and cytokeratins for the detection of recurrent disease following curative resection of colorectal cancer.
abstract: OBJECTIVE
  To evaluate the efficacy of postoperative serial assay of carcinoembryonic antigen (CEA) and cytokeratins for the detection of recurrent disease in patients with colorectal adenocarcinoma after radical surgery.
  
  
  METHODS
  Between 1993 and 2000, 120 patients with colorectal adenocarcinoma underwent radical surgery in the Department of Surgical Gastroenterology, Federal University of Sao Paulo-Escola Paulista de Medicina, Sao Paulo, Brazil. Periodic postoperative evaluation was performed by assaying markers in peripheral serum, colonoscopy and imaging examination. Presence of CEA was detected using the Delfia method with 5 microg/L threshold, and cytokeratins using the LIA-mat TPA-M Prolifigen method with 72 U/L threshold.
  
  
  RESULTS
  In the first postoperative year, patients without recurrent disease had normal levels of CEA (1.5 +/- 0.9 microg/L) and monoclonal tissue polypeptide antigen-M (TPA-M, 64.4 +/- 47.8 U/L), while patients with recurrences had high levels of CEA (6.9 +/- 9.8 microg/L, P < 0.01) and TPA-M (192.2 +/- 328.8 U/L, P < 0.05). During the second postoperative year, patients without tumor recurrence had normal levels of CEA (2.0 +/- 1.8 microg/L) and TPA-M (50.8 +/- 38.4 U/L), while patients with recurrence had high levels of CEA (66.3 +/- 130.8 microg/L, P < 0.01) and TPA-M (442.7 +/- 652.8 U/L, P < 0.05). The mean follow-up time was 22.3 mo. There was recurrence in 23 cases. Five reoperations were performed without achieving radical excision. Rises in tumor marker levels preceded identification of recurrences: CEA in seven (30%) and TPA-M in eleven individuals (48%).
  
  
  CONCLUSIONS
  Intensive follow-up by serial assay of CEA and cytokeratins allows early detection of colorectal neoplasm recurrence.
authors.affiliation: Department of Surgical Gastroenterology, Federal University of São Paulo-Escola Paulista de Medicina, Brazil. luiscfernandes@terra.com.br
authors.forename: Luis C
authors.initials: LC
authors.lastname: Fernandes
authors.forename: Su B
authors.initials: SB
authors.lastname: Kim
authors.forename: Sarhan S
authors.initials: SS
authors.lastname: Saad
authors.forename: Delcio
authors.initials: D
authors.lastname: Matos
mesh_terms: D000230:Adenocarcinoma / Q000097:blood* / Q000473:pathology / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000097:blood; D002272:Carcinoembryonic Antigen / Q000097:blood*; D015179:Colorectal Neoplasms / Q000097:blood* / Q000473:pathology / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007633:Keratins / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000097:blood* / Q000175:diagnosis* / Q000473:pathology; D011237:Predictive Value of Tests
chemical_list: D014408:Biomarkers, Tumor; D002272:Carcinoembryonic Antigen; D007633:Keratins