title: [Meta analysis of 2025 cases with multiple primary colorectal carcinoma].
abstract: OBJECTIVE
  To summarize the clinicopathological characteristics of multiple primary colorectal carcinoma.
  
  
  METHODS
  With "multiple primary colorectal carcinoma" as search words,and with the same inclusion and exclusion criteria, related Chinese literatures published were retrieved. A meta analysis was carried out.
  
  
  RESULTS
  The incidence of multiple primary colorectal carcinoma was 2.9%; and the average age was 53 years. 55.2% of the cases with synchronous multiple primary colorectal carcinoma were diagnosed by fiberoptic colonoscopy before operation,37.5% by intraoperative exploration, 15.7% by postoperative pathology. 94.8% of the cases with metachronous multiple primary colorectal carcinoma were diagnosed by fiberoptic colonoscopy before operation,and the average interval was 5.2 years. 30.9% of the lesions were located in the rectum, 19.9% in the sigmoid, 9.0% in the descending colon, 5.2% the in splenic flexure, 9.1% in the transverse colon, 6.1% in the hepatic flexure, 11.8% in the ascending colon,and 8.1% in the caecum. 37.6% of the cases were complicated with extra- intestinal lesions,and 43.7% adenoma or polyps. 34.6% of the cases had lymph node metastasis. Histological type was the same in 60.6% of the cases,and adenocarcinoma accounted for 89.2% and cancerization of adenoma 8.4%. Radical resection was performed in 85.9% and palliative resection in 10.1% of the cases. The 3, 5, 10 and 15 year survival rates were 64.3%, 44.6%, 26.3% or 9.4% in synchronous multiple primary colorectal carcinoma respectively, and 69.6%, 59.2%, 45.0%, 36.7% in metachronous multiple primary colorectal carcinoma.
  
  
  CONCLUSIONS
  Multiple primary colorectal carcinoma is rare in clinic. The diagnosis mainly depends on colonoscopy and intra-operative exploration. The resection rate is high and the prognosis is better. The prognosis of metachronous multiple primary carcinoma is better than that of synchronous multiple primary colorectal carcinoma.
authors.affiliation: Department of General Surgery, Ningxiang People's Hospital, Changsha 410600, China. hjj7899508@yahoo.com.cn
authors.forename: Jian-jun
authors.initials: JJ
authors.lastname: He
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002681:China / Q000453:epidemiology; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000453:epidemiology / Q000601:surgery*; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D055815:Young Adult