Persistant Organics Pollutants (POP) accumulate in the adipose tissue (AT) and could modulate tumor progression as part of the microenvironment. The investigators tested the hypothesis that POPs exposure may be associated with breast cancer metastasis analyzing the concentrations of 46 POPs in both adipose tissue and serum samples from breast tumor patients (benign, malignant with and without lymph node metastasis)

The investigators set up a longitudinal prospective monocentric cohort study in the gynecologic-oncologic surgery department of European Hospital Georges-Pompidou, with patients undergoing partial or total mastectomies, lymph node biopsies or axillary lymph node removal and sampling of the adipocytic tumour microenvironment to measure POPs using gas chromatography coupled to high-resolution mass spectrometry. The objective is to analyze the concentrations of 46 POPs including polychlorinated dibenzo(p)dioxins and furans (PCDD/Fs), polychlorinated biphenyls (PCBs), polybromodiphenyl ethers (PBDEs) and polybromobiphenyls (PBBs) in both adipose tissue (AT) and serum samples from breast tumor patients (benign, malignant with and without lymph node metastasis).

Inclusion Criteria:

• Patient with breast tumor: benign or malignant
• Tumor size at least 1cm or palpable tumor
• Undergoing a breast surgery in European Georges Pompidou hospital
• Understanding the protocol and who signed a written consent

Exclusion Criteria: patients unable to give informed consent

• Dementia
• Guardianship

Analyzing the concentrations of 46 POPs in both adipose tissue and serum samples from breast tumor patients (benign, malignant with and without lymph node metastasis).