Associations of red and processed meat with survival after colorectal cancer and differences according to timing of dietary assessment

作者：Carr Prudence R; Jansen Lina; Walter Viola; Kloor Matthias; Roth Wilfried; Blaeker Hendrik; Chang Claude Jenny; Brenner Hermann; Hoffmeister Michael^*

来源：American Journal of Clinical Nutrition, 2016, 103(1): 192-200.

DOI：10.3945/ajcn.115.121145

• colorectal cancer
• molecular subtypes
• mortality
• red and processed meat
• survival

Background: Little is known about the prognostic impact of red and processed meat intake or about changes in consumption after a diagnosis of colorectal cancer (CRC).
Objectives: We investigated associations of baseline red and processed meat with survival outcomes and explored changes in intake among CRC survivors 5 y after diagnosis.
Design: A total of 3122 patients diagnosed with CRC between 2003 and 2010 were followed for a median of 4.8 y [DACHS (Darmkrebs: Chancen der Verhutung durch Screening) study]. Patients provided information on diet and other factors in standardized questionnaires at baseline and at the 5-y follow-up. Cox proportional hazards regression models were used to estimate HRs and 95% CIs.
Results: Among patients with stage I-III CRC, baseline red and processed meat intake was not associated with overall (>1 time/d compared with <1 time/d; HR: 0.85; 95% CI: 0.67, 1.09), CRC-specific (HR: 0.83; 95% CI: 0.61, 1.14), cardiovascular disease specific (HR: 0.92; 95% CI: 0.51, 1.68), non CRC-specific (HR: 0.88; 95% CI: 0.59, 1.30), and recurrence-free (BR: 1.03; 95% CI: 0.80, 1.33) survival; results among stage IV patients were comparable. An association with worse overall survival was found among patients with Kirsten rat sarcoma viral oncogene homolog (KRAS)-mutated CRC (HR: 1.99; 95% CI: 1.10, 3.56) but not with microsatellite instability or CpG island methylator phenotype (GNP) positivity. A much lower proportion of survivors reported daily consumption of red and processed meat at the 5-y follow-up than at baseline (concordance rate: 39%; k-value: 0.10; 95% CI: 0.07, 0.13).
Conclusions: Our findings suggest that baseline red and processed meat intake is not associated with poorer survival among patients with CRC. The potential interaction with KRAS mutation status warrants further evaluation. Major changes in consumption measured at the 5-y follow-up may have had an impact on our survival estimates.

• 出版日期2016-1