title: Integrin alpha3 expression as a prognostic factor in colon cancer: association with MRP-1/CD9 and KAI1/CD82.
abstract: Recently, we established that a murine monoclonal antibody (MAb) MH8-4 inhibits the motility of the colon cancer cell line RPMI4788 and that it recognizes integrin alpha3. In addition, we have also cloned the motility-related protein-1 (MRP-1)/cluster of differentiation 9 (CD9) as a metastasis suppressor molecule. We investigated integrin alpha3 expression in 114 resected colon cancers using immunohistochemistry and reverse transcription-polymerase chain reaction (RT-PCR) to evaluate whether these experimental results are of relevance in the prognosis of actual colon cancers. Furthermore, we investigated the correlation of integrin alpha3 with MRP-1/CD9 and KAI1/CD82. Sixty patients (52.6%) were evaluated as integrin alpha3-positive and 54 patients (47.4%) as integrin alpha3-negative. Integrin alpha3 expression was associated with tumor status, lymph node status and pathologic stage. The overall and disease-free survival rates for patients whose tumors were positive for integrin alpha3 were significantly higher than for those with integrin alpha3-negative tumors (p < 0.001 and p < 0.001, respectively). This same tendency was observed in node-negative patients (p = 0.007 and p = 0.001, respectively). Integrin alpha3 was found to be the significant prognostic factor in a multivariate analysis using the Cox proportional hazards model (p = 0.036). A correlation was found between integrin alpha3 with MRP-1/CD9 and KAI1/CD82 for stage I tumors. However, no correlation was found in stage III tumors. Our data seem to suggest that low expression of integrin alpha3 is a useful indicator of a poor prognosis for colon cancer patients and that colon cancer progresses following collapse of the complex formed by integrin alpha3 with MRP-1/CD9 and KAI1/CD82.
authors.affiliation: Department V of Oncology and Department of Thoracic Surgery, Kitano Hospital, Tazuke Kofukai Medical Research Institute, Osaka, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Hashida
authors.forename: Arimichi
authors.initials: A
authors.lastname: Takabayashi
authors.forename: Takahiro
authors.initials: T
authors.lastname: Tokuhara
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Taki
authors.forename: Keiichi
authors.initials: K
authors.lastname: Kondo
authors.forename: Nobuoki
authors.initials: N
authors.lastname: Kohno
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Yamaoka
authors.forename: Masayuki
authors.initials: M
authors.lastname: Miyake
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000096:biosynthesis* / Q000235:genetics; D002448:Cell Adhesion; D002465:Cell Movement; D003110:Colonic Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D018450:Disease Progression; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D039422:Integrin alpha3; D016023:Integrins / Q000096:biosynthesis* / Q000235:genetics; D051861:Kangai-1 Protein; D046911:Macromolecular Substances; D008297:Male; D008562:Membrane Glycoproteins / Q000378:metabolism*; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009363:Neoplasm Proteins / Q000096:biosynthesis* / Q000235:genetics; D009367:Neoplasm Staging; D011379:Prognosis; D016016:Proportional Hazards Models; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger / Q000096:biosynthesis; D012334:RNA, Neoplasm / Q000096:biosynthesis; D012189:Retrospective Studies; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016019:Survival Analysis; D060245:Tetraspanin 29
chemical_list: D015703:Antigens, CD; D014408:Biomarkers, Tumor; C497688:CD82 protein, human; C554869:CD9 protein, human; D039422:Integrin alpha3; D016023:Integrins; D051861:Kangai-1 Protein; D046911:Macromolecular Substances; D008562:Membrane Glycoproteins; D009363:Neoplasm Proteins; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D060245:Tetraspanin 29