Neutrophil Extracellular Traps Formation in Breast Cancer Patients Taking Tamoxifen

PRIMARY OBJECTIVE: I. To examine the effect of long-term tamoxifen (TAM) treatment on excessive NET formation in breast cancer patients. SECONDARY OBJECTIVES: I. To understand the molecular mechanisms of tamoxifen-induced NET formation in breast cancer patients by examining the effect of long-term TAM treatment on the NET-induced factors. II. To correlate the extend of NET formation with clinical data on tamoxifen resistance, drug side-effects, cancer metastasis and comorbidities. EXPLORATORY OBJECTIVE: I. To explore the association between the extent of NET formation and clinical data for breast cancer patients treated with TAM in combination with other drugs. OUTLINE: Patients undergo collection of blood samples and their medical charts are reviewed.