title: Histopathological grading does not affect survival after R0 surgery for gastric cancer.
abstract: OBJECTIVE
  It is unclear whether Histopathological Grading (UICC, TNM Classification) affects survival after resection for gastric cancer.
  
  
  METHODS
  To investigate the prognostic significance of Histopathological Grading after gastrectomy, 1455 patients who underwent gastric resection for gastric adenocarcinoma were reviewed.
  
  
  RESULTS
  The R0 (UICC, R Classification) resection rate was inversely correlated with the grade (86.5% for Grade 1, 79.7% for Grade 2 and 69.2% for Grade 3) and the R1 and R2 resection rates increased with the grade. The Histopathological Grading did not influence survival in the 1119 patients who underwent R0 resection (71.0% for Grade 1, 65.7% for Grade 2 and 66.7% for Grade 3). When multivariate analysis was performed for the 1119 cases undergoing R0 resection, the Histopathological Grading was not a determinant prognostic factor.
  
  
  CONCLUSIONS
  We conclude that the UICC Histopathological Grading affects R0 resection rates, but does not affect survival independently.
mesh_terms: D000230:Adenocarcinoma / Q000401:mortality* / Q000601:surgery*; D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D005743:Gastrectomy; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009367:Neoplasm Staging; D011379:Prognosis; D013223:Statistics as Topic; D013270:Stomach / Q000473:pathology* / Q000601:surgery*; D013274:Stomach Neoplasms / Q000401:mortality* / Q000601:surgery*; D015996:Survival Rate; D016896:Treatment Outcome