title: Laminin β3 expression as a prognostic factor and a predictive marker of chemoresistance in colorectal cancer.
abstract: OBJECTIVE
  Laminin-332, a marker of epithelial-mesenchymal transition, is composed of a heterotrimer of α3, β3 and γ2 chains that regulates cell adhesion and migration. This study aimed to disclose the respective clinical significance of laminin β3 immunoexpression in colorectal cancer as a prognostic factor and a predictive marker of chemoresistance.
  
  
  METHODS
  Tissue specimens from 323 Stage II and 232 Stage III colorectal cancer patients who underwent curative resection were assessed using laminin β3 immunostaining.
  
  
  RESULTS
  Among Stage III colorectal cancer patients, comparisons of 5-year disease-free survival rates revealed a poorer prognosis for the laminin β3-high group than for the laminin β3-low group (52.3 vs. 70.7%, P = 0.038), while there was no significant difference among Stage II patients. Among laminin β3-low Stage III patients, those who received adjuvant chemotherapy showed marginally better disease-free survival than those who did not receive it (75.8 vs. 62.8%; P = 0.096). Furthermore, multivariate analysis corroborated a distinct benefit of adjuvant chemotherapy in laminin β3-low patients (P = 0.035; hazard risk ratio = 1.66). Analyses of the laminin β3-high group, however, failed to show significance.
  
  
  CONCLUSIONS
  Laminin β3 chain immunoreactivity was a poor prognostic factor for Stage III colorectal cancer patients, and laminin β3-high patients of Stage III colorectal cancer derived no survival benefit from adjuvant chemotherapy.
authors.affiliation: Department of Surgery, National Defense Medical College, Saitama s-fukazawa2015@outlook.jp.
authors.forename: Satomi
authors.initials: S
authors.lastname: Fukazawa
authors.affiliation: Department of Surgery, National Defense Medical College, Saitama.
authors.forename: Eiji
authors.initials: E
authors.lastname: Shinto
authors.affiliation: Department of Pathology, National Defense Medical College, Saitama, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Tsuda
authors.affiliation: Department of Surgery, National Defense Medical College, Saitama.
authors.forename: Hideki
authors.initials: H
authors.lastname: Ueno
authors.affiliation: Department of Surgery, National Defense Medical College, Saitama.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Shikina
authors.affiliation: Department of Surgery, National Defense Medical College, Saitama.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Kajiwara
authors.affiliation: Department of Surgery, National Defense Medical College, Saitama.
authors.forename: Junji
authors.initials: J
authors.lastname: Yamamoto
authors.affiliation: Department of Surgery, National Defense Medical College, Saitama.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Hase
mesh_terms: D000328:Adult; D000368:Aged; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000494:pharmacology*; D014408:Biomarkers, Tumor / Q000032:analysis*; D015815:Cell Adhesion Molecules / Q000032:analysis*; D017024:Chemotherapy, Adjuvant; D015179:Colorectal Neoplasms / Q000737:chemistry / Q000188:drug therapy* / Q000473:pathology; D018572:Disease-Free Survival; D019008:Drug Resistance, Neoplasm; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011379:Prognosis; D018570:Risk Assessment; D012307:Risk Factors; D000097794:Kalinin
chemical_list: D000970:Antineoplastic Agents; D014408:Biomarkers, Tumor; D015815:Cell Adhesion Molecules; D000097794:Kalinin
keywords: chemoresistance; colorectal cancer; laminin β3; prognostic factor