title: PDGF-BB is a novel prognostic factor in colorectal cancer.
abstract: OBJECTIVE
  Human platelet-derived growth factor BB (PDGF-BB) is thought to be involved in human malignancies. Its overexpression has been reported in some human tumors. However, its expression in colorectal cancer has not been studied. We thus investigated the clinicopathological and biological significance of PDGF-BB gene expression in human colorectal cancer.
  
  
  METHODS
  Using real-time reverse transcription-PCR, we evaluated PDGF-BB expression status and correlated data with clinicopathological parameters in 60 patients with colorectal cancer. Additionally, we established a colorectal cancer cell line expressing PDGF-BB and investigated its effects on cell invasion and proliferation.
  
  
  RESULTS
  The incidence of vascular invasion was significantly greater in patients expressing PDGF-BB at a high level than in those at a low level (P < .05). Patients with high PDGF-BB expression had a significantly poorer survival rate than those with low PDGF-BB expression (P < .05). A multivariate analysis demonstrated that PDGF-BB expression was an independent prognostic factor. We demonstrated in vitro that cells transduced with PDGF-BB showed greater invasiveness (P < .05) and migration (P < .001) than did mock transduced cells. In a xenograft study, cells transduced with PDGF-BB had higher proliferation rates than mock transfected cells.
  
  
  CONCLUSIONS
  PDGF-BB expression may be a new prognostic indicator for patients with colorectal cancer.
authors.affiliation: Department of Surgery, Medical Institute of Bioregulation, Kyushu University, 4546 Tsurumibaru, Beppu 874-0838, Japan.
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Tanaka
authors.forename: Yasuji
authors.initials: Y
authors.lastname: Yoshikawa
authors.forename: Koshi
authors.initials: K
authors.lastname: Mimori
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Inoue
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Yanaga
authors.forename: Masaki
authors.initials: M
authors.lastname: Mori
mesh_terms: D000077214:Becaplermin; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology; D015870:Gene Expression; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D009361:Neoplasm Invasiveness; D010982:Platelet-Derived Growth Factor / Q000096:biosynthesis*; D011379:Prognosis; D020574:Proto-Oncogene Proteins c-sis; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D000077214:Becaplermin