Browsing by Author "Snetselaar, Linda"

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    Citrus Consumption and Risk of Cutaneous Malignant Melanoma in the Women’s Health Initiative
    (Routledge, 2020) Melough, Melissa M.; Wu, Shaowei; Li, Wen-Qing; Eaton, Charles; Nan, Hongmei; Snetselaar, Linda; Wallace, Robert; Qureshi, Abrar A.; Chun, Ock K.; Cho, Eunyoung; Epidemiology, School of Public Health
    Citrus products are rich sources of furocoumarins, a class of photoactive compounds. Certain furocoumarins combined with ultraviolet radiation can induce skin cancer. We examined the relationship between citrus consumption and cutaneous melanoma risk among 56,205 Caucasian postmenopausal women in the Women’s Health Initiative. Cox proportional hazards models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) of melanoma by citrus intake level. During a mean follow-up of 15.7 years, 956 incident melanoma cases were documented. In multivariable adjusted models, the HR (95% CI) for melanoma was 1.12 (0.91, 1.37) among the highest citrus consumers (1.5+ servings/day of fruit or juice) versus the lowest (<2 servings/week), 0.95 (0.76, 1.20) among the highest citrus fruit consumers (5+ servings/week) versus non-consumers, and was 1.13 (0.96, 1.32) for the highest citrus juice consumers (1+ servings/day) versus the lowest (<1 serving/week). In stratified analyses, an increased melanoma risk associated with citrus juice intake was observed among women who spent the most time outdoors in summer as adults; the HR for the highest versus lowest intake was 1.22 (1.02, 1.46) (p-trend = 0.03). Further research is needed to explore the association of melanoma with citrus juices among women with high sun exposure.
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    Genetically predicted circulating concentrations of micronutrients and risk of colorectal cancer among individuals of European descent: a Mendelian randomization study
    (Elsevier, 2021) Tsilidis, Konstantinos K.; Papadimitriou, Nikos; Dimou, Niki; Gill, Dipender; Lewis, Sarah J.; Martin, Richard M.; Murphy, Neil; Markozannes, Georgios; Zuber, Verena; Cross, Amanda J.; Burrows, Kimberley; Lopez, David S.; Key, Timothy J.; Travis, Ruth C.; Perez-Cornago, Aurora; Hunter, David J.; van Duijnhoven, Fränzel J. B.; Albanes, Demetrius; Arndt, Volker; Berndt, Sonja I.; Bézieau, Stéphane; Bishop, D. Timothy; Boehm, Juergen; Brenner, Hermann; Burnett-Hartman, Andrea; Campbell, Peter T.; Casey, Graham; Castellví-Bel, Sergi; Chan, Andrew T.; Chang-Claude, Jenny; de la Chapelle, Albert; Figueiredo, Jane C.; Gallinger, Steven J.; Giles, Graham G.; Goodman, Phyllis J.; Gsur, Andrea; Hampe, Jochen; Hampel, Heather; Hoffmeister, Michael; Jenkins, Mark A.; Keku, Temitope O.; Kweon, Sun-Seog; Larsson, Susanna C.; Le Marchand, Loic; Li, Christopher I.; Li, Li; Lindblom, Annika; Martín, Vicente; Milne, Roger L.; Moreno, Victor; Nan, Hongmei; Nassir, Rami; Newcomb, Polly A.; Offit, Kenneth; Pharoah, Paul D. P.; Platz, Elizabeth A.; Potter, John D.; Qi, Lihong; Rennert, Gad; Sakoda, Lori C.; Schafmayer, Clemens; Slattery, Martha L.; Snetselaar, Linda; Schenk, Jeanette; Thibodeau, Stephen N.; Ulrich, Cornelia M.; Van Guelpen, Bethany; Harlid, Sophia; Visvanathan, Kala; Vodickova, Ludmila; Wang, Hansong; White, Emily; Wolk, Alicja; Woods, Michael O.; Wu, Anna H.; Zheng, Wei; Bueno-de-Mesquita, Bas; Boutron-Ruault, Marie-Christine; Hughes, David J.; Jakszyn, Paula; Kühn, Tilman; Palli, Domenico; Riboli, Elio; Giovannucci, Edward L.; Banbury, Barbara L.; Gruber, Stephen B.; Peters, Ulrike; Gunter, Marc J.; Epidemiology, School of Public Health
    Background: The literature on associations of circulating concentrations of minerals and vitamins with risk of colorectal cancer is limited and inconsistent. Evidence from randomized controlled trials (RCTs) to support the efficacy of dietary modification or nutrient supplementation for colorectal cancer prevention is also limited. Objectives: To complement observational and RCT findings, we investigated associations of genetically predicted concentrations of 11 micronutrients (β-carotene, calcium, copper, folate, iron, magnesium, phosphorus, selenium, vitamin B-6, vitamin B-12, and zinc) with colorectal cancer risk using Mendelian randomization (MR). Methods: Two-sample MR was conducted using 58,221 individuals with colorectal cancer and 67,694 controls from the Genetics and Epidemiology of Colorectal Cancer Consortium, Colorectal Cancer Transdisciplinary Study, and Colon Cancer Family Registry. Inverse variance-weighted MR analyses were performed with sensitivity analyses to assess the impact of potential violations of MR assumptions. Results: Nominally significant associations were noted for genetically predicted iron concentration and higher risk of colon cancer [ORs per SD (ORSD): 1.08; 95% CI: 1.00, 1.17; P value = 0.05] and similarly for proximal colon cancer, and for vitamin B-12 concentration and higher risk of colorectal cancer (ORSD: 1.12; 95% CI: 1.03, 1.21; P value = 0.01) and similarly for colon cancer. A nominally significant association was also noted for genetically predicted selenium concentration and lower risk of colon cancer (ORSD: 0.98; 95% CI: 0.96, 1.00; P value = 0.05) and similarly for distal colon cancer. These associations were robust to sensitivity analyses. Nominally significant inverse associations were observed for zinc and risk of colorectal and distal colon cancers, but sensitivity analyses could not be performed. None of these findings survived correction for multiple testing. Genetically predicted concentrations of β-carotene, calcium, copper, folate, magnesium, phosphorus, and vitamin B-6 were not associated with disease risk. Conclusions: These results suggest possible causal associations of circulating iron and vitamin B-12 (positively) and selenium (inversely) with risk of colon cancer.