Association of portfolio diet score with breast cancer risk: insights from a case-control analysis.

Background: The Portfolio Diet (PD) is a plant-based dietary approach that has been associated with a reduced risk of cancer-related mortality. The aim of this study was to investigate the relationship between PD score (PDS) and breast cancer (BC) risk in Iranian women, providing insights into the impact of diet on BC risk across different menopausal stages.

Methods: The current case-control study included 133 women with newly diagnosed BC and 265 controls without any neoplastic disorders, all of whom were referred to the oncology department of two referral hospitals in Tehran, Iran.