DietCompLyf is a multi-centre prospective study designed to investigate associations between
phytoestrogens - naturally occurring plant compounds with oestrogenic properties - and other diet and lifestyle factors with
breast cancer recurrence and survival. 3159 women with grades I-III
breast cancer were recruited 9-15 months post-diagnosis from 56 UK hospitals. Detailed information on clinico-pathological, diet, lifestyle and quality of life is collected annually up to 5 years.
Biological samples have also been collected as a resource for subsequent evaluation. The characteristics of the patients and associations between pre-diagnosis intake of
phytoestrogens (
isoflavones and
lignans; assessed using the EPIC-Norfolk UK 130 question food frequency questionnaire) and
breast cancer (i) risk factors and (ii) prognostic factors are described for 1797 women who had complete data for all covariates and
phytoestrogens of interest.
Isoflavone intakes were higher in the patients who were younger at diagnosis, in the non-smokers, those who had breast-fed and those who took supplements.
Lignan intakes were higher in patients with a higher age at diagnosis, in ex-smokers, those who had breast-fed, who took supplements, had a lower BMI at diagnosis, lower age at menarche and were nulliparous. No significant associations between pre-diagnosis
phytoestrogen intake and factors associated with improved
breast cancer prognosis were observed. The potential for further exploration of the relationship between
phytoestrogens and
breast cancer recurrence and survival, and for the establishment of evidence to improve dietary and lifestyle advice offered to patients following
breast cancer diagnosis using DietCompLyf data is discussed.