title: [Rule of lymph node metastasis in colorectal cancer and its affecting factors].
abstract: OBJECTIVE
  To investigate the rule of lymph node metastasis in colorectal cancer and its affecting factors, and to provide clues for clinical diagnosis and treatment of colorectal cancer patients.
  
  
  METHODS
  The clinical data of 1166 cases of colorectal cancer receiving surgical resection were analyzed retrospectively.The relationships between clinicopathologic variables and lymph node metastases were evaluated by crosstabs and logistic regression in SPSS 10.0 for windows.
  
  
  RESULTS
  The rate of lymph node metastasis in colorectal cancer was 49.7%. After entering crosstabs estimation, gender and tumor site were not significantly correlated with lymph node metastasis in colorectal cancer(chi2=1.46, r=0.035, P>0.05 and chi2=3.86, r=0.012, P>0.05). Age, tumor size, the massive type of the tumor, the differentiating degree of the tumor, histology type and the depth of tumor invasion were proved to be independent factors influencing the lymph node metastasis in colorectal cancer (chi2 =13.1, r=0.064, P<0.05 and chi2=77.161, r=0.245, P<0.01 and chi2=144.831, r=0.341, P<0.01 and chi2=128.310, r=0.318, P<0.01 and chi2=120.418, r=0.319, P<0.01 and chi2=227.287, r=0.434, P<0.01). After entering logistic regression estimation, the correlativity of risk factor of lymph node metastasis in colorectal cancer: the depth of tumor invasion > the massive type of the tumor>the differentiating degree of the tumor > tumor size. Preoperative blood serum CEA level was significantly correlated with lymph node metastasis (chi2=509.599, r=0.661, P<0.01).
  
  
  CONCLUSIONS
  The depth of tumor invasion is the most risk factor of lymph node metastasis in colorectal cancer. Preoperative high level of blood serum CEA indicates the occurrence of lymph node metastasis.
authors.affiliation: Department of General Surgery, Zhejiang Provincial People's Hospital, Hangzhou 310014, China. tushiliang@126.com
authors.forename: Shi-liang
authors.initials: SL
authors.lastname: Tu
authors.forename: Zai-yuan
authors.initials: ZY
authors.lastname: Ye
authors.forename: Gao-li
authors.initials: GL
authors.lastname: Deng
authors.forename: Zhong-sheng
authors.initials: ZS
authors.lastname: Zhao
authors.forename: Quan-jin
authors.initials: QJ
authors.lastname: Dong
authors.forename: Bo-an
authors.initials: BA
authors.lastname: Zheng
authors.forename: Li-ping
authors.initials: LP
authors.lastname: Ding
authors.forename: Hong-feng
authors.initials: HF
authors.lastname: Cao
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002272:Carcinoembryonic Antigen; D015179:Colorectal Neoplasms / Q000097:blood / Q000473:pathology*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008207:Lymphatic Metastasis / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D012189:Retrospective Studies; D012307:Risk Factors; D055815:Young Adult
chemical_list: D002272:Carcinoembryonic Antigen