Fiber Intake and Survival After Colorectal Cancer Diagnosis
Open accessAbstract
IMPORTANCE: Although high dietary fiber intake has been associated with a lower risk of colorectal cancer (CRC), it remains unknown whether fiber benefits CRC survivors. OBJECTIVE: To assess the association of postdiagnostic fiber intake with mortality. DESIGN, SETTING, AND PARTICIPANTS: A total of 1575 health care professionals with stage I to III CRC were evaluated in 2 prospective cohorts, Nurses' Health Study and Health Professionals Follow-up Study. Colorectal cancer-specific and overall mortality were determined after adjusting for other potential predictors for cancer survival. The study was conducted from December 23, 2016, to August 23, 2017. EXPOSURES: Consumption of total fiber and different sources of fiber and whole grains assessed by a validated food frequency questionnaire between 6 months and 4 years after CRC diagnosis. MAIN OUTCOMES AND MEASURES: Hazard ratios (HRs) and 95% CIs of CRC-specific and overall mortality after adjusting for other potential predictors for cancer survival. RESULTS: Of the 1575 participants, 963 (61.1%) were women; mean (SD) age was 68.6 (8.9) years. During a median of 8 years of follow-up, 773 deaths were documented, including 174 from CRC. High intake of total fiber after diagnosis was associated with lower mortality. The multivariable HR per each 5-g increment in intake per day was 0.78 (95% CI, 0.65-0.93; P = .006) for CRC-specific mortality and 0.86 (95% CI, 0.79-0.93; P < .001) for all-cause mortality. Patients who increased their fiber intake after diagnosis from levels before diagnosis had a lower mortality, and each 5-g/d increase in intake was associated with 18% lower CRC-specific mortality (95% CI, 7%-28%; P = .002) and 14% lower all-cause mortality (95% CI, 8%-19%; P < .001). According to the source of fiber, cereal fiber was associated with lower CRC-specific mortality (HR per 5-g/d increment, 0.67; 95% CI, 0.50-0.90; P = .007) and all-cause mortality (HR, 0.78; 95% CI, 0.68-0.90; P < .001); vegetable fiber was associated with lower all-cause mortality (HR, 0.83; 95% CI, 0.72-0.96; P = .009) but not CRC-specific mortality (HR, 0.82; 95% CI, 0.60-1.13; P = .22); no association was found for fruit fiber. Whole grain intake was associated with lower CRC-specific mortality (HR per 20-g/d increment, 0.72; 95% CI, 0.59-0.88; P = .002), and this beneficial association was attenuated after adjusting for fiber intake (HR, 0.77; 95% CI, 0.62-0.96; P = .02). CONCLUSIONS AND RELEVANCE: Higher fiber intake after the diagnosis of nonmetastatic CRC is associated with lower CRC-specific and overall mortality. Increasing fiber consumption after diagnosis may confer additional benefits to patients with CRC.
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- Findingown data
Using cumulative average fiber consumption after diagnosis produced findings similar to the main analysis.
“Similar findings were obtained when cumulative average fiber consumption after diagnosis was used for the analysis (eTable 2).”
Quote in the paperNot a substantial claim - Findingown data
In propensity score analysis, the hazard ratio for all-cause mortality per 5-g/day increment in total fiber was 0.86 (95% CI, 0.79-0.93).
“Similar results were also obtained in the propensity score analysis, with the corresponding HRs of 0.80 (95% CI, 0.67-0.96, P for trend=0.02) and 0.86 (95% CI, 0.79-0.93, P for trend<0.001), respectively, indicating the robustness of our findings to confounding.”
Quote in the paperSubstantial claim - Findingown data
No further reduction in all-cause mortality was found beyond about 24 g/day of fiber intake.
“For all-cause mortality, a statistically significant nonlinear relationship was observed (P=0.007); the benefit associated with increasing fiber intake achieved its maximum at about 24 g/day and no further reduction in mortality was found beyond this level of intake (Figure 1).”
Quote in the paperSubstantial claim - Findingown data
Vegetable fiber intake was associated with lower all-cause mortality (HR per 5-g/day increment, 0.83; 95% CI, 0.72-0.96).
“Vegetable fiber was associated with lower all-cause mortality (HR per 5-g/day increment, 0.83, 95% CI, 0.72-0.96, P for trend=0.009) but not CRC-specific mortality (HR, 0.82, 95% CI, 0.60-1.13, P for trend=0.22).”
Quote in the paperSubstantial claim - Findingown data
No other statistically significant interaction was detected in the subgroup analyses.
“No other statistically significant interaction was detected.”
Quote in the paperNot a substantial claim
- Findingown data
The hazard ratio for all-cause mortality per 5-g/day increment in cereal fiber was 0.78 (95% CI, 0.68-0.90).
“The HR associated with 5-g/day increment in cereal fiber was 0.67 (95% CI, 0.50-0.90, P for trend=0.007) for CRC-specific mortality and 0.78 (95% CI, 0.68-0.90, P for trend<0.001) for all-cause mortality.”
Quote in the paperSubstantial claim - Findingown data
In propensity score analysis, the hazard ratio for colorectal cancer-specific mortality per 5-g/day increment in total fiber was 0.80 (95% CI, 0.67-0.96).
“Similar results were also obtained in the propensity score analysis, with the corresponding HRs of 0.80 (95% CI, 0.67-0.96, P for trend=0.02) and 0.86 (95% CI, 0.79-0.93, P for trend<0.001), respectively, indicating the robustness of our findings to confounding.”
Quote in the paperSubstantial claim - Findingown data
The multivariable hazard ratio for all-cause mortality per 5-g/day increment in total fiber intake was 0.86 (95% CI, 0.79-0.93).
“The multivariable HR per each 5-g increase in intake per day was 0.78 (95% CI, 0.65-0.93, P=0.006) for CRC-specific mortality and 0.86 (95% CI, 0.79-0.93, P<0.001) for all-cause mortality.”
Quote in the paperSubstantial claim - Findingown data
Vegetable fiber intake was not associated with colorectal cancer-specific mortality (HR per 5-g/day increment, 0.82; 95% CI, 0.60-1.13).
“Vegetable fiber was associated with lower all-cause mortality (HR per 5-g/day increment, 0.83, 95% CI, 0.72-0.96, P for trend=0.009) but not CRC-specific mortality (HR, 0.82, 95% CI, 0.60-1.13, P for trend=0.22).”
Quote in the paperSubstantial claim - Findingown data
The inverse association of fiber intake with mortality was restricted to low alcohol consumers and non-regular aspirin users.
“We observed a statistically significant interaction with alcohol consumption for CRC-specific mortality (P=0.05) and with regular aspirin use for all-cause mortality (P=0.01): the inverse association of fiber intake with mortality was restricted to low alcohol consumer and non-regular aspirin users.”
Quote in the paperNot a substantial claim - Findingown data
After adjustment for other potential determinants of cancer prognosis, total fiber intake after diagnosis was inversely associated with colorectal cancer-specific mortality.
“As shown in Table 1, fiber intake was inversely associated with CRC-specific mortality after adjusting for other potential determinants for cancer prognosis.”
Quote in the paperSubstantial claim - Findingown data
No statistically significant interaction was detected between fiber intake and tumor subsite or stage.
“No statistically significant interaction was detected between fiber intake and tumor subsite or stage (P for interaction>0.05) (eTable 3).”
Quote in the paperNot a substantial claim - Findingown data
Each 5-g/day increase in fiber intake after diagnosis was associated with 18% lower colorectal cancer-specific mortality (95% CI, 7-28%).
“As shown in Table 1, patients who increased their fiber intake after diagnosis from levels before diagnosis had a lower mortality and each 5-g/day increase in fiber intake was associated with 18% lower CRC-specific mortality (95% CI, 7-28%, P=0.002) and 14% lower all-cause mortality (95% CI, 8-19%, P<0.001).”
Quote in the paperSubstantial claim - Findingown data
In a sensitivity analysis excluding the first year of follow-up, the hazard ratio for colorectal cancer-specific mortality per 5-g/day increment in total fiber was 0.80 (95% CI, 0.66-0.97).
“The results remained essentially unchanged, with the multivariable HR per 5-g/day increment for CRC-specific mortality of 0.80 (95% CI, 0.66-0.97, P for trend=0.02) and the HR for all-cause mortality of 0.85 (95% CI, 0.78-0.93, P for trend=0.002).”
Quote in the paperSubstantial claim - Findingown data
Patients who increased their fiber intake after diagnosis relative to before diagnosis had lower mortality.
“As shown in Table 1, patients who increased their fiber intake after diagnosis from levels before diagnosis had a lower mortality and each 5-g/day increase in fiber intake was associated with 18% lower CRC-specific mortality (95% CI, 7-28%, P=0.002) and 14% lower all-cause mortality (95% CI, 8-19%, P<0.001).”
Quote in the paperSubstantial claim - Findingown data
A statistically significant interaction was observed between fiber intake and alcohol consumption for colorectal cancer-specific mortality (P=0.05).
“We observed a statistically significant interaction with alcohol consumption for CRC-specific mortality (P=0.05) and with regular aspirin use for all-cause mortality (P=0.01): the inverse association of fiber intake with mortality was restricted to low alcohol consumer and non-regular aspirin users.”
Quote in the paperNot a substantial claim - Findingown data
The association between whole grain intake and colorectal cancer-specific mortality was attenuated after adjusting for total fiber intake (HR, 0.77; 95% CI, 0.62-0.96).
“This association was attenuated after adjusting for total fiber intake (HR=0.77, 95% CI, 0.62-0.96, P for trend=0.02).”
Quote in the paperSubstantial claim - Findingown data
Each 5-g/day increase in fiber intake after diagnosis was associated with 14% lower all-cause mortality (95% CI, 8-19%).
“As shown in Table 1, patients who increased their fiber intake after diagnosis from levels before diagnosis had a lower mortality and each 5-g/day increase in fiber intake was associated with 18% lower CRC-specific mortality (95% CI, 7-28%, P=0.002) and 14% lower all-cause mortality (95% CI, 8-19%, P<0.001).”
Quote in the paperSubstantial claim - Findingown data
In the same sensitivity analysis excluding the first year, the hazard ratio for all-cause mortality per 5-g/day increment in total fiber was 0.85 (95% CI, 0.78-0.93).
“The results remained essentially unchanged, with the multivariable HR per 5-g/day increment for CRC-specific mortality of 0.80 (95% CI, 0.66-0.97, P for trend=0.02) and the HR for all-cause mortality of 0.85 (95% CI, 0.78-0.93, P for trend=0.002).”
Quote in the paperSubstantial claim - Findingown data
Patients in the highest quartile of fiber intake were more likely to have stage I cancer than other patients.
“Anatomic subsite and grade of differentiation did not differ across quartiles of fiber intake, whereas patients with the highest fiber intake were more likely to have stage I cancer than others.”
Quote in the paperNot a substantial claim - Findingown data
For all-cause mortality, a statistically significant nonlinear relationship was observed between fiber intake and mortality (P=0.007).
“For all-cause mortality, a statistically significant nonlinear relationship was observed (P=0.007); the benefit associated with increasing fiber intake achieved its maximum at about 24 g/day and no further reduction in mortality was found beyond this level of intake (Figure 1).”
Quote in the paperSubstantial claim - Findingown data
The hazard ratio for colorectal cancer-specific mortality per 5-g/day increment in cereal fiber was 0.67 (95% CI, 0.50-0.90).
“The HR associated with 5-g/day increment in cereal fiber was 0.67 (95% CI, 0.50-0.90, P for trend=0.007) for CRC-specific mortality and 0.78 (95% CI, 0.68-0.90, P for trend<0.001) for all-cause mortality.”
Quote in the paperSubstantial claim - Findingown data
Whole grain consumption was associated with lower colorectal cancer-specific mortality (HR per 20-g/day increment, 0.72; 95% CI, 0.59-0.88).
“Whole grain consumption was associated with lower CRC-specific mortality, with the multivariable HR per 20-g/day increment of 0.72 (95% CI, 0.59-0.88, P for trend=0.002) (Table 3).”
Quote in the paperSubstantial claim - Findingown data
The multivariable hazard ratio for colorectal cancer-specific mortality per 5-g/day increment in total fiber intake was 0.78 (95% CI, 0.65-0.93).
“The multivariable HR per each 5-g increase in intake per day was 0.78 (95% CI, 0.65-0.93, P=0.006) for CRC-specific mortality and 0.86 (95% CI, 0.79-0.93, P<0.001) for all-cause mortality.”
Quote in the paperSubstantial claim - Findingown data
Whole grain intake was associated with lower all-cause mortality (HR per 20-g/day increment, 0.88; 95% CI, 0.80-0.97).
“Similar, but weaker, attenuation was observed for all-cause mortality, with the HR changing from 0.88 (95% CI, 0.80-0.97, P for trend=0.008) to 0.91 (0.83-1.01, P for trend=0.08) after including fiber in the multivariable model.”
Quote in the paperSubstantial claim - Findingown data
After including fiber in the multivariable model, the whole grain all-cause mortality hazard ratio attenuated to 0.91 (95% CI, 0.83-1.01).
“Similar, but weaker, attenuation was observed for all-cause mortality, with the HR changing from 0.88 (95% CI, 0.80-0.97, P for trend=0.008) to 0.91 (0.83-1.01, P for trend=0.08) after including fiber in the multivariable model.”
Quote in the paperSubstantial claim - Findingown data
A statistically significant interaction was observed between fiber intake and regular aspirin use for all-cause mortality (P=0.01).
“We observed a statistically significant interaction with alcohol consumption for CRC-specific mortality (P=0.05) and with regular aspirin use for all-cause mortality (P=0.01): the inverse association of fiber intake with mortality was restricted to low alcohol consumer and non-regular aspirin users.”
Quote in the paperNot a substantial claim - Findingown data
After mutual adjustment for fruit and vegetable fiber, cereal fiber showed an inverse association with lower mortality.
“As shown in Table 2, fiber from cereals showed an inverse association with lower mortality after mutual adjustment for fruit and vegetable fiber.”
Quote in the paperSubstantial claim - Findingown data
Spline analysis showed a linear relationship between total fiber intake after diagnosis and colorectal cancer-specific mortality.
“The spline analysis showed a linear relationship between fiber intake after diagnosis and CRC-specific mortality.”
Quote in the paperNot a substantial claim - Findingown data
Fiber intakes from cereals, vegetables, and fruits were weakly correlated (Spearman r<0.25).
“Fiber intakes from these sources were weakly correlated (Spearman correlation coefficient r<0.25, eTable 4).”
Quote in the paperNot a substantial claim - Interpretationown data
The similarity of results from multivariable adjustment and propensity score analysis indicates that the findings are robust to confounding.
“Similar results were also obtained in the propensity score analysis, with the corresponding HRs of 0.80 (95% CI, 0.67-0.96, P for trend=0.02) and 0.86 (95% CI, 0.79-0.93, P for trend<0.001), respectively, indicating the robustness of our findings to confounding.”
Quote in the paperSubstantial claim - Study design and conductown data
Data on cancer recurrences were unavailable in the cohorts.
“Second, beyond cause of mortality, data on cancer recurrences were unavailable in our cohorts.”
Quote in the paperSubstantial claim - Premisecitation
Hyperinsulinemia and markers of insulin resistance and inflammation may mediate the adverse metabolic effect of obesity and physical inactivity on colorectal cancer recurrence and death.
“Emerging, albeit limited, evidence suggests that hyperinsulinemia and markers of insulin resistance and inflammation predict worse survival in CRC patients,38,39 and may mediate the adverse metabolic effect of obesity and physical inactivity on CRC recurrence and death.23,40”
Quote in the paperSubstantial claim0 of 2 sources checked- cites [23] Meyerhardt JA Giovannucci EL Ogino S Physical activity and male colorectal cancer survival Arch Intern Med 2009 169 22 2102 2108 20008694 PMC2852183
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [40] Cespedes Feliciano EM Kroenke CH Meyerhardt JA Metabolic Dysfunction, Obesity, and Survival Among Patients With Early-Stage Colorectal Cancer J Clin Oncol 2016 PMC5065112 27601537
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Premisecitation
A meta-analysis of 25 prospective studies found that each 10-g increment in daily total or cereal fiber intake was associated with about 10% lower risk of developing colorectal cancer.
“According to a recent meta-analysis of 25 prospective studies, each 10-gram increment in daily intake of total and cereal fiber was associated with approximately 10% lowered risk of developing CRC.31”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [31] Aune D Chan DS Lau R Dietary fibre, whole grains, and risk of colorectal cancer: systematic review and dose-response meta-analysis of prospective studies BMJ 2011 343 d6617 22074852 PMC3213242
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Interpretationcitation
Because median survival for metastatic colorectal cancer was about 10 to 12 months during much of the study period, colorectal cancer-specific mortality should be a reasonable surrogate for cancer-specific outcomes.
“Nevertheless, because the median survival for metastatic CRC was approximately 10 to 12 months during much of the period of this study,59 CRC-specific mortality should be a reasonable surrogate for cancer-specific outcomes.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [59] Meyerhardt JA Mayer RJ Systemic therapy for colorectal cancer N Engl J Med 2005 352 5 476 487 15689586
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Study design and conductnone given
The number of colorectal cancer-specific deaths in the study was relatively small.
“Third, the number of CRC-specific deaths is relatively small, and therefore further large-scale studies are needed.”
Quote in the paperSubstantial claim - Study design and conductreasoning
Detailed covariate data collected in parallel with fiber intake allowed rigorous control for confounding by various predictors of cancer survival.
“Moreover, the detailed covariate data collected in parallel with fiber intake allowed for rigorous control for confounding by various predictors of cancer survival.”
Quote in the paperSubstantial claim - Premisecitation
Substantial evidence supports a protective effect of high fiber intake against colorectal cancer development.
“Substantial evidence supports the protective effect of high fiber intake for CRC prevention.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [31] Aune D Chan DS Lau R Dietary fibre, whole grains, and risk of colorectal cancer: systematic review and dose-response meta-analysis of prospective studies BMJ 2011 343 d6617 22074852 PMC3213242
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Study design and conductnone given
Detailed treatment data were largely unavailable in the cohorts.
“First, detailed treatment data were largely unavailable in the cohorts.”
Quote in the paperSubstantial claim - Interpretationown data
The findings provide novel evidence for a potential benefit of increasing fiber and whole grain consumption among colorectal cancer patients.
“Our findings provide novel evidence for the potential benefit of increasing fiber and whole grain consumption among CRC patients.”
Quote in the paperSubstantial claim - Interpretationreasoning
Higher fiber intake after colorectal cancer diagnosis may improve survival by mitigating the tumor-promoting effect of hyperinsulinemia and inflammation.
“Therefore, higher fiber intake after CRC diagnosis may improve patients’ survival by mitigating the tumor-promoting effect of hyperinsulinemia and inflammation.”
Quote in the paperSubstantial claim - Premisecitation
Bacterial fermentation of fiber produces butyrate.
“Bacterial fermentation of fiber also produces butyrate, which has been increasingly implicated in modulation of the tumor microenvironment.41”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [41] Encarnacao JC Abrantes AM Pires AS Botelho MF Revisit dietary fiber on colorectal cancer: butyrate and its role on prevention and treatment Cancer Metastasis Rev 2015 34 3 465 478 26224132
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Study design and conductown data
The study collected detailed pre-diagnostic and post-diagnostic diet and lifestyle information.
“Advantages of the current study include the prospective design, detailed collection of pre- and post-diagnostic diet and lifestyle information, standardized medical record review of self-reported CRC and deaths, and long-term follow-up.”
Quote in the paperSubstantial claim - Study design and conductreasoning
The ability to control for disease stage minimized potential confounding by treatment.
“Thus, our ability to control for stage in our analyses minimized any potential confounding by treatment.”
Quote in the paperSubstantial claim- Rests on an assumption: During the study period, adjuvant treatment was largely standardized and primarily correlated with disease stage.
- Premisecitation
Butyrate may influence colorectal cancer prognosis by modulating tumor-infiltrating immune cells, including regulatory T cells and macrophages.
“Moreover, butyrate may influence CRC prognosis by modulating the function of tumor-infiltrating immune cells, including regulatory T cells42,43 and macrophages,44 which have been increasingly recognized for their critical roles in tumor-host interactions and cancer prognosis.45,46”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites [42] Smith PM Howitt MR Panikov N The microbial metabolites, short-chain fatty acids, regulate colonic Treg cell homeostasis Science 2013 341 6145 569 573 23828891 PMC3807819
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [43] Arpaia N Campbell C Fan X Metabolites produced by commensal bacteria promote peripheral regulatory T-cell generation Nature 2013 504 7480 451 455 24226773 PMC3869884
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [44] Chang PV Hao L Offermanns S Medzhitov R The microbial metabolite butyrate regulates intestinal macrophage function via histone deacetylase inhibition Proc Natl Acad Sci U S A 2014 111 6 2247 2252 24390544 PMC3926023
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Premisecitation
Emerging evidence suggests that hyperinsulinemia and markers of insulin resistance and inflammation predict worse survival in colorectal cancer patients.
“Emerging, albeit limited, evidence suggests that hyperinsulinemia and markers of insulin resistance and inflammation predict worse survival in CRC patients,38,39 and may mediate the adverse metabolic effect of obesity and physical inactivity on CRC recurrence and death.23,40”
Quote in the paperSubstantial claim0 of 2 sources checked- cites [38] Volkova E Willis JA Wells JE Robinson BA Dachs GU Currie MJ Association of angiopoietin-2, C-reactive protein and markers of obesity and insulin resistance with survival outcome in colorectal cancer Br J Cancer 2011 104 1 51 59 21081932 PMC3039823
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [39] Wolpin BM Meyerhardt JA Chan AT Insulin, the insulin-like growth factor axis, and mortality in patients with nonmetastatic colorectal cancer J Clin Oncol 2009 27 2 176 185 19064975 PMC2645084
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Study design and conductreasoning
Because all participants were health professionals, differences in access to adjuvant chemotherapy are minimized.
“In addition, because all participants were health professionals, any difference in access to adjuvant chemotherapy is minimized.”
Quote in the paperNot a substantial claim - Study design and conductown data
The study had long-term follow-up.
“Advantages of the current study include the prospective design, detailed collection of pre- and post-diagnostic diet and lifestyle information, standardized medical record review of self-reported CRC and deaths, and long-term follow-up.”
Quote in the paperSubstantial claim - Study design and conductown data
The study had a prospective design.
“Advantages of the current study include the prospective design, detailed collection of pre- and post-diagnostic diet and lifestyle information, standardized medical record review of self-reported CRC and deaths, and long-term follow-up.”
Quote in the paperSubstantial claim
- May combine two claims. 10
- Classified as probably not a substantial claim. 8
- The quote only partly states this claim. 2
May combine two claims.
Findingown dataThe observed 5-year survival rates were 83% for stage I, 82% for stage II, and 72% for stage III colorectal cancer.
“The overall 5-year survival rates were 83% (95% CI, 79-86%) for stage I cancer, 82% (95% CI, 78-86%) for stage II cancer, and 72% (95% CI, 67-76%) for stage III cancer.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataPre-diagnostic and post-diagnostic fiber intakes were modestly correlated (Spearman r=0.58).
“Pre- and post-diagnostic intake of fiber was modestly correlated (Spearman correlation coefficient r=0.58).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataIn the combined NHS and HPFS cohorts, 1,575 patients with stage I to III colorectal cancer were followed for a median of 8 years, during which 773 deaths occurred, 174 of them from colorectal cancer.
“Among 1,575 eligible patients diagnosed with stage I to III CRC, we documented 773 deaths, of which 174 were classified as CRC-specific deaths over a median of 8 years of follow-up.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataAmong the subset of patients with chemotherapy data, fiber intake was similar between those who received chemotherapy and those who did not.
“In a subset of patients with chemotherapy data (n=375), fiber intake was similar among those who received chemotherapy (median=19.5 g/day) versus those who did not (median=19.1 g/day) (P for Wilcoxon test =0.13).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataPatients with higher fiber intake tended to have a healthier lifestyle.
“Participants with higher fiber intake tended to have a healthier lifestyle (eTable 1).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataAnatomic subsite and grade of differentiation did not differ across quartiles of fiber intake.
“Anatomic subsite and grade of differentiation did not differ across quartiles of fiber intake, whereas patients with the highest fiber intake were more likely to have stage I cancer than others.”
Quote in the paperNot a substantial claimThe quote only partly states this claim.
Findingown dataThe benefit of increasing fiber intake for all-cause mortality reached its maximum at about 24 g/day.
“For all-cause mortality, a statistically significant nonlinear relationship was observed (P=0.007); the benefit associated with increasing fiber intake achieved its maximum at about 24 g/day and no further reduction in mortality was found beyond this level of intake (Figure 1).”
Quote in the paperSubstantial claimThe quote only partly states this claim.
Findingown dataNo association was found between fruit fiber intake and mortality.
“In contrast, no association was found for fruit fiber.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
Study design and conductnone givenThe study used standardized medical record review of self-reported colorectal cancer and deaths.
“Advantages of the current study include the prospective design, detailed collection of pre- and post-diagnostic diet and lifestyle information, standardized medical record review of self-reported CRC and deaths, and long-term follow-up.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationAnimal studies have shown that high-fiber diets promote apoptosis and suppress colorectal tumor development.
“This agrees with the well-established data from animal studies that high-fiber diets promote apoptosis and suppress colorectal tumor development.32–34”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites [32] Avivi-Green C Polak-Charcon S Madar Z Schwartz B Dietary regulation and localization of apoptosis cascade proteins in the colonic crypt J Cell Biochem 2000 77 1 18 29 10679813
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [33] Fleiszer D Murray D MacFarlane J Brown RA Protective effect of dietary fibre against chemically induced bowel tumours in rats Lancet 1978 2 8089 552 553 79919
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [34] Cao Y Gao X Zhang W Dietary fiber enhances TGF-beta signaling and growth inhibition in the gut Am J Physiol Gastrointest Liver Physiol 2011 301 1 G156 164 21454444 PMC3129933
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
May combine two claims.
Interpretationown dataHigher whole grain consumption was associated with better survival, and this association was partly mediated by fiber.
“Higher consumption of whole grains was also associated with better survival, and this beneficial association was partly mediated by fiber.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationButyrate is a major energy source for normal colonocytes, is metabolized less in cancer cells due to the Warburg effect, accumulates in the nucleus of cancerous colonocytes, and inhibits histone deacetylase to regulate genes involved in tumor growth, angiogenesis, migration, and chemoresistance.
“Although butyrate is a major energy source for normal colonocytes, it is metabolized to a lesser extent in cancer cells due to the Warburg effect and accumulates in the nucleus of cancerous colonocytes, in which it functions as an inhibitor of histone deacetylase to epigenetically regulate expression of numerous genes responsible for tumor growth, angiogenesis, migration, and chemoresistance.41”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [41] Encarnacao JC Abrantes AM Pires AS Botelho MF Revisit dietary fiber on colorectal cancer: butyrate and its role on prevention and treatment Cancer Metastasis Rev 2015 34 3 465 478 26224132
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
May combine two claims.
Interpretationown dataHigher intake of fiber and whole grains after colorectal cancer diagnosis is associated with lower death rates from colorectal cancer and other causes.
“In conclusion, higher intake of fiber and whole grains after CRC diagnosis is associated with lower rate of death from that disease and other causes.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataAdjusting for fiber intake attenuated the association between whole grain intake and lower mortality, suggesting that fiber may be an important contributor to the protective effect of whole grains.
“However, in the current study, adjusting for fiber intake indeed attenuated the association between whole grain and lower mortality, suggesting that fiber may be an important contributor for the protective effect of whole grains.58”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [58] Larsson SC Giovannucci E Bergkvist L Wolk A Whole grain consumption and risk of colorectal cancer: a population-based cohort of 60,000 women Br J Cancer 2005 92 9 1803 1807 15827552 PMC2362029
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
May combine two claims.
Interpretationown dataThe effect of high fiber intake may extend beyond protection against cancer incidence and contribute to better prognosis after cancer is established.
“Our current study adds to the existing literature and suggests that the effect of high fiber intake may extend beyond protection against cancer incidence and contribute to better prognosis after cancer is established.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
Interpretationown dataThe findings support nutritional recommendations to maintain sufficient fiber intake among colorectal cancer survivors.
“Our findings provide support for the nutritional recommendations of maintaining sufficient fiber intake among CRC survivors.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationHigher intake of fiber, especially cereal fiber, has been linked to improved insulin sensitivity, lipid profile, endothelial function, and reduced inflammation.
“Higher intake of fiber, especially cereal fiber, has been linked to improved insulin sensitivity,35 lipid profile,36 endothelial function, and reduced inflammation.37”
Quote in the paperSubstantial claim0 of 3 sources checked- cites [35] Weickert MO Mohlig M Schofl C Cereal fiber improves whole-body insulin sensitivity in overweight and obese women Diabetes Care 2006 29 4 775 780 16567814
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [36] Davy BM Davy KP Ho RC Beske SD Davrath LR Melby CL High-fiber oat cereal compared with wheat cereal consumption favorably alters LDL-cholesterol subclass and particle numbers in middle-aged and older men Am J Clin Nutr 2002 76 2 351 358 12145006
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [37] Qi L van Dam RM Liu S Franz M Mantzoros C Hu FB Whole-grain, bran, and cereal fiber intakes and markers of systemic inflammation in diabetic women Diabetes Care 2006 29 2 207 211 16443861
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
InterpretationcitationThe observed stage-specific 5-year survival rates in this cohort appeared comparable to national estimates.
“These rates appeared to be comparable to national estimates.30”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [30] SEER Cancer Statistics Review, 1975–2013 National Cancer Institute 2016 https://seer.cancer.gov/csr/1975_2013/. Accessed August 02, 2017
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningAs an observational study, residual confounding cannot be excluded.
“Finally, as an observational study, residual confounding cannot be excluded, although we observed similar results through multivariable adjustment and propensity score analysis.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationPrevious observational data on favorable influences of other lifestyle factors on colorectal cancer survival have subsequently been confirmed in randomized trials.
“Of note, previous observational data regarding the favorable influence of other lifestyle factors on CRC survival have been subsequently confirmed in randomized trials.”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites [60] Schmid D Leitzmann MF Association between physical activity and mortality among breast cancer and colorectal cancer survivors: a systematic review and meta-analysis Ann Oncol 2014 25 7 1293 1311 24644304
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [61] Maalmi H Ordonez-Mena JM Schottker B Brenner H Serum 25-hydroxyvitamin D levels and survival in colorectal and breast cancer patients: systematic review and meta-analysis of prospective cohort studies Eur J Cancer 2014 50 8 1510 1521 24582912
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites [62] Song M Zhang X Meyerhardt JA Marine omega-3 polyunsaturated fatty acid intake and survival after colorectal cancer diagnosis Gut 2016 PMC5247396 27436272
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
The authors state this as an assumption.
Before this study, no prior study had examined the association between fiber intake and survival among colorectal cancer patients.
“Despite these data, to our knowledge no study has yet examined the association between fiber intake and survival of CRC patients.”
The authors state this as an assumption.
This study is the first prospective study to examine the prognostic influence of fiber intake among colorectal cancer patients.
“To our knowledge, this is the first prospective study examining the prognostic influence of fiber intake among CRC patients.”
The paper relies on this without support.
During the study period, adjuvant treatment was largely standardized and primarily correlated with disease stage.
“Moreover, during the time period of the study, adjuvant treatment was largely standardized and primarily correlated with disease stage.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In colorectal cancer patients, greater consumption of fiber, marine omega-3s, vitamin D, calcium, coffee, or a plant-based low-carbohydrate diet has been linked to longer survival.
“Higher intake of nutrients such as fiber,199 marine omega-3 fatty acid,200–202 vitamin D,203–205 or calcium,203 or coffee206, 207 or a plant-based low-carbohydrate diet207 has been associated with increased survival times of patients with CRC.”
From Influence of the Gut Microbiome, Diet, and Environment on Risk of Colorectal Cancer (2020) · cites this paper as [199]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Conflicting P values for vegetable fiber and CRC-specific mortality
MinorThe abstract reports P=0.12, while the Results reports P=0.22 for the same vegetable-fiber association. Both give an HR of 0.82 and a 95% CI of 0.60-1.13.
“vegetable fiber was associated with lower all-cause mortality (HR, 0.83, 95% CI, 0.72-0.96, P=0.009) but not CRC-specific mortality (HR, 0.82, 95% CI, 0.60-1.13, P=0.12)”
“Vegetable fiber was associated with lower all-cause mortality (HR per 5-g/day increment, 0.83, 95% CI, 0.72-0.96, P for trend=0.009) but not CRC-specific mortality (HR, 0.82, 95% CI, 0.60-1.13, P for trend=0.22).”
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- Authors
- Song, M., Wu, K., Meyerhardt, J. A., Ogino, S., Wang, M., Fuchs, C. S., Giovannucci, E. L., & Chan, A. T.
- Affiliations
- Harvard University (US)
- Brigham and Women's Hospital (US)
- Yale Cancer Center (US)
- Broad Institute (US)
- Corresponding author
- Chan, Andrew T.
- ORCID
- Venue
- JAMA Oncology
- Publisher
- American Medical Association (AMA)
- Published
- 2018-01-01
- Volume
- 4
- Issue
- 1
- Pages
- 71
- ISSN
- 2374-2437 (ISSN-L)
- PMC
- PMC5776713
- OpenAlex
- W2766404639
- Cited by
- 197
- References
- 71
- Citations by year
- 2026: 13 · 2025: 25 · 2024: 25 · 2023: 24 · 2022: 29 · 2021: 20 · 2020: 25 · 2019: 17 · 2018: 19
- FWCI
- 15.64
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- JAMA Oncology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health (UL1TR001863)
- National Cancer Institute (R01CA176272, P50CA127003, R01CA202704, R01CA151993, R01CA118553, R01CA137178, R35CA197735, P01CA087969, R01CA169141, P01CA055075, UM1CA186107, UM1CA167552, U01CA176726, U01CA167552)
- National Institute of Diabetes and Digestive and Kidney Diseases (K24DK098311)
- National Center for Advancing Translational Sciences
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
- Health Sciences › Nursing › Nutrition and Dietetics › Food composition and properties
- Health Sciences › Medicine › Oncology › Colorectal Cancer Screening and Detection
- Keywords
- dietary fiber intake, colorectal cancer, cancer survivors, mortality, colorectal cancer-specific mortality, all-cause mortality, cereal fiber, whole grains, Nurses' Health Study, Health Professionals Follow-up Study, healthcare workers
- MeSH terms
- Cancer Survivors, Adult, Aged, Diet Surveys, Dietary Fiber, Eating, Feeding Behavior, Female, Follow-Up Studies, Health Occupations, Humans, Male, Middle Aged, Prospective Studies, Colorectal Neoplasms, Cohort Studies
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-07.
Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-07.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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