title: Flow cytometric examination of p53 protein in primary tumors and metastases to the liver and lymph nodes of colorectal cancer.
abstract: OBJECTIVE
  To confirm prognostic significance of overexpression of p53 in cases of colorectal cancer, expression of p53 protein was examined by flow cytometry in 113 cases of colorectal cancer and its metastasis to the liver and lymph nodes.
  
  
  RESULTS
  Overexpression of p53 was found in 44 (39 percent) of the 113 primary tumors. There were no significant correlations among the level of p53 protein in the primary tumor, clinicopathologic features, and prognosis of colorectal cancer. Overexpression of p53 protein was detected in 72 percent (18/25) of liver metastases and in 40 percent (10/25) of lymph node metastases. Frequency of samples that were positive for p53 was significantly higher for liver metastases than for primary tumors and lymph node metastases (P < 0.01). By comparing overexpression of p53 in primary tumors with that in corresponding secondary tumors, a decrease of more than 5 percent in the fluorescence index, compared with primary tumor, was not found in liver metastasis but was found in 20 percent of lymph node metastases. Incidence of cases with lower level expression of p53, compared with primary tumor, was significantly higher in lymph node metastases (32 percent) than in liver metastases (8 percent; P < 0.05).
  
  
  CONCLUSIONS
  From these results, it seems possible that overexpression of p53 may not be a good prognostic indicator of colorectal cancer and may be influenced by environments of the tumor.
authors.affiliation: Department of Surgery I, Faculty of Medicine, Tottori University, Yonago, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Kimura
authors.forename: K
authors.initials: K
authors.lastname: Sugamura
authors.forename: T
authors.initials: T
authors.lastname: Kijima
authors.forename: M
authors.initials: M
authors.lastname: Makino
authors.forename: H
authors.initials: H
authors.lastname: Shirai
authors.forename: S
authors.initials: S
authors.lastname: Tatebe
authors.forename: H
authors.initials: H
authors.lastname: Ito
authors.forename: N
authors.initials: N
authors.lastname: Kaibara
mesh_terms: D015153:Blotting, Western; D015179:Colorectal Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology*; D004273:DNA, Neoplasm / Q000235:genetics; D005434:Flow Cytometry; D006801:Humans; D008113:Liver Neoplasms / Q000556:secondary*; D008207:Lymphatic Metastasis; D011003:Ploidies; D015996:Survival Rate; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D004273:DNA, Neoplasm; D016159:Tumor Suppressor Protein p53