Improving the AJCC/TNM staging for adenocarcinomas of the appendix: the prognostic impact of histological grade.

Abstract:

PURPOSE:Though histological grade is known to have a major prognostic impact in metastatic mucinous appendiceal adenocarcinomas, the prognostic impact of grade in localized disease, and the validity of the American Joint Committee on Cancer AJCC Staging Manual 7th edition's decision to combine moderately and poorly differentiated mucinous adenocarcinomas into a single mucinous high-grade category, is not known. METHODS:Patients with adenocarcinoma of the appendix diagnosed between 1988 and 2007 were identified from the SEER database. Cancer-specific survival (CSS) stratified by histological subtype, stage, and grade was calculated, and Cox proportional hazards regression analyses were performed. RESULTS:We analyzed a total of 2469 appendiceal adenocarcinomas, of which 1375 had mucinous histology and 860 had nonmucinous histology. Though overall CSS was similar for mucinous and nonmucinous subtypes, differences in stage distribution and stage-stratified CSS were seen. Female sex, stage IV disease, and well-differentiated histology were more common for mucinous adenocarcinomas. Histological grade had a strong prognostic impact, especially in patients with stage IV mucinous adenocarcinoma. The adjusted hazard ratios for stage IV moderately and poorly differentiated histological grade were 1.63 [95% confidence interval (CI): 1.14-2.34] and 4.94 (95% CI: 3.32-7.35) for mucinous histology, in comparison with 1.44 (95% CI: 0.82-2.52) and 1.90 (95% CI: 0.95-3.80) for nonmucinous histology, respectively. CONCLUSIONS:The strong prognostic impact of histological grade for mucinous adenocarcinomas is primarily restricted to stage IV disease. Stage IV moderately and poorly differentiated mucinous adenocarcinomas have distinctly different CSS and these data do not support the combination of these 2 histological grades in the recent AJCC Staging Manual 7th edition.

journal_name

Ann Surg

journal_title

Annals of surgery

authors

Overman MJ,Fournier K,Hu CY,Eng C,Taggart M,Royal R,Mansfield P,Chang GJ

doi

10.1097/SLA.0b013e318269d680

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

1072-8

issue

6

eissn

0003-4932

issn

1528-1140

journal_volume

257

pub_type

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