Breast cancer is a multifactorial disease that has become a major health concern worldwide. Epidemiological research strongly suggests a connection between vitamin D deficiency and an increased risk of breast cancer. Studies reveal that particularly postmenopausal women with insufficient vitamin D levels face a notably increased likelihood of developing breast cancer^[1,2].

Additionally, studies have demonstrated that vitamin D deficiency is prevalent among breast cancer patients, highlighting the critical need for its detection and inclusion in clinical practice and treatment^[3,4].