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Description: IJERPH, Vol. 15, Pages 1946: Dietary Patterns and Breast Cancer Risk: A Multi-Centre Case Control Study among North Indian Women International Journal of Environmental Research and Public Health doi: 10.3390/ijerph15091946 Authors: Krithiga Shridhar Gurpreet Singh Subhojit Dey Sarvdeep Singh Dhatt Jatinder Paul Singh Gill Michael Goodman Melina Samar Magsumbol Neil Pearce Sandeep Singh Archna Singh Preeti Singh Jarnail Singh Thakur Preet Kaur Dhillon Evidence from India, a country with unique and distinct food intake patterns often characterized by lifelong adherence, may offer important insight into the role of diet in breast cancer etiology. We evaluated the association between Indian dietary patterns and breast cancer risk in a multi-centre case-control study conducted in the North Indian states of Punjab and Haryana. Eligible cases were women 30–69 years of age, with newly diagnosed, biopsy-confirmed breast cancer recruited from hospitals or population-based cancer registries. Controls (hospital- or population-based) were frequency matched to the cases on age and region (Punjab or Haryana). Information about diet, lifestyle, reproductive and socio-demographic factors was collected using a structured interviewer-administered questionnaire. All participants were characterized as non-vegetarians, lacto-vegetarians (those who consumed no animal products except dairy) or lacto-ovo-vegetarians (persons whose diet also included eggs). The study population included 400 breast cancer cases and 354 controls. Most (62%) were lacto-ovo-vegetarians. Breast cancer risk was lower in lacto-ovo-vegetarians compared to both non-vegetarians and lacto-vegetarians with odds ratios (95% confidence intervals) of 0.6 (0.3–0.9) and 0.4 (0.3–0.7), respectively. The unexpected difference between lacto-ovo-vegetarian and lacto-vegetarian dietary patterns could be due to egg-consumption patterns which requires confirmation and further investigation.