Adapted dietary inflammatory index and differentiated thyroid carcinoma risk in two French population-based case–control studies

Abstract Despite research efforts, current knowledge of the etiology of thyroid carcinoma remains limited. To explore the potential role of diet-induced inflammation, we examined the association between differentiated thyroid cancer risk and the energy-adjusted Dietary Inflammatory Index (E-DII) in a population-based case-control study conducted in New Caledonia, a Pacific archipelago with one of the highest recorded thyroid cancer incidence rates in the world. The E-DII was computed from food frequency questionnaire information on usual dietary intake. Logistic regression analyses were performed on data from 324 histologically confirmed cases of papillary or follicular carcinoma, diagnosed from 1993 to 1999, and 402 controls. Positive associations between E-DII and thyroid cancer risk were observed (comparing extreme tertiles, odds ratio = 1.67, 95% confidence interval: 1.08, 2.58; P for trend = 0.002), with stronger associations found for larger carcinomas (P for trend = 0.0005). Stratified analyses showed an increased risk of thyroid cancer associated with the E-DII among Southern province residents (P for trend = 0.003), Melanesian women (P for trend = 0.02), obese participants (P for trend = 0.006), and ever-smokers (P for trend = 0.0005). Our results suggest that a proinflammatory diet—especially when concomitant with other inflammation-inducing conditions or habits (e.g., obesity, smoking)—is associated with increased risk of thyroid carcinoma.

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Dietary Inflammatory Index and Pancreatic Cancer Risk—A Systematic Review and Dose-response Meta-analysis

Public Health Nutrition ◽

10.1017/s1368980021001579 ◽

2021 ◽

pp. 1-24

Author(s):

Zhangyou Guo ◽

Yuan Hong ◽

Yao Cheng

Keyword(s):

Systematic Review ◽

Pancreatic Cancer ◽

Dose Response ◽

Meta Analysis ◽

Case Control ◽

Cochrane Library ◽

Dietary Inflammatory Index ◽

Case Control Studies ◽

Inflammatory Index ◽

Incident Cases

Abstract Objective: The meta-analysis was conducted to test the link between pancreatic cancer (PC) risk and dietary inflammatory index (DII®) score. Design: Systematic review and meta-analysis. Setting: We searched PubMed, Embase, Web of Science, and the Cochrane Library up to November 22, 2020, to identify the relevant studies. Studies that reported the risk estimates and the corresponding 95% confidence intervals (CIs) for the DII category and PC risk were included. The effect sizes were pooled using the random-effects model. Dose–response analysis was conducted where possible. Participants: Two prospective cohort studies of 634 705 participants (3 152 incident cases), and four case-control studies of 2 737 cases and 4 861 controls. Results: Overall, the pooled risk ratio (RR) indicated that individuals in the highest category compared with the lowest category had an increased PC risk (RR=1.45; 95% CI 1.11, 1.90; P=0.006). Meanwhile, significant heterogeneity was also revealed. The dose-response meta-analysis indicated that a 1-unit increase in the DII score was associated with the PC risk (RR=1.08; 95% CI 1.002, 1.166; P=0.045; I 2 =94.1%, P<0.001). Nonlinear result showed an increased risk of moving from fewer to more inflammatory borders with increasing DII score (Pnonlinearity = 0.003; I 2 =76.5%, P<0.001). Subgroup analyses found that significant positive association between PC risk and DII score appeared to be in case-control studies (RR=1.70; 95% CI 1.16, 2.50; P=0.007) and studies with ≤31 DII components (RR=1.76; 95% CI 1.14, 2.72; P=0.011). Conclusion: These findings suggested dietary habits with high inflammatory features (high DII score) might increase PC risk.

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