title: Abnormal expression of CD44 variants in the exfoliated cells in the feces of patients with colorectal cancer.
abstract: OBJECTIVE
  Recent investigations have shown that CD44 variant exons are frequently overexpressed in human colorectal adenocarcinoma. The aim of this study was to investigate abnormal expression of the CD44 gene in exfoliated cells from patients with colorectal cancer.
  
  
  METHODS
  Exfoliated cells in feces from 25 patients with colorectal cancer before and after surgery and from 15 healthy volunteers were analyzed. CD44 standard, variant 6, and variant 10 messenger RNA (mRNA) expressions were examined in the exfoliated cells in feces by using reverse-transcription polymerase chain reaction followed by Southern hybridization with exon-specific probes.
  
  
  RESULTS
  CD44 standard mRNA was detected in all samples before and after surgery and in all healthy volunteers. CD44 variant 6 and variant 10 mRNA were detected in 17 of 25 patients (68%) and 15 of 25 patients (60%), respectively, in individual feces obtained before surgery. CD44 variant 6 mRNA and variant 10 mRNA were detected in postoperative samples in 3 of 25 patients (12%) and 7 of 25 patients (28%), respectively. Fifteen of 17 patients who were positive for CD44v6 based on preoperative fecal samples became negative after surgery (88.2%). Similarly, 12 of 15 patients who were CD44v10 positive in preoperative fecal samples were negative postoperatively (80%).
  
  
  CONCLUSIONS
  These results suggest that analysis of CD44 variant expression in the exfoliated cells in feces can provide a noninvasive diagnostic test for colorectal cancer.
authors.affiliation: Department of Medicine, National Cancer Center Hospital, Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamao
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumura
authors.forename: Y
authors.initials: Y
authors.lastname: Shimada
authors.forename: Y
authors.initials: Y
authors.lastname: Moriya
authors.forename: K
authors.initials: K
authors.lastname: Sugihara
authors.forename: T
authors.initials: T
authors.lastname: Akasu
authors.forename: S
authors.initials: S
authors.lastname: Fujita
authors.forename: T
authors.initials: T
authors.lastname: Kakizoe
mesh_terms: D000328:Adult; D000368:Aged; D015139:Blotting, Southern; D015179:Colorectal Neoplasms / Q000276:immunology* / Q000473:pathology*; D005243:Feces / Q000737:chemistry* / Q000166:cytology; D005260:Female; D015870:Gene Expression / Q000502:physiology; D014644:Genetic Variation / Q000235:genetics; D006801:Humans; D018960:Hyaluronan Receptors / Q000032:analysis / Q000235:genetics*; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis*; D012016:Reference Values; D014158:Transcription, Genetic
chemical_list: D018960:Hyaluronan Receptors; D012333:RNA, Messenger