The main objective of this study is to estimate of the link (odds ratio) between the precariousness defined by the score SPICE (2 groups: precarious and insecure) and stage at diagnosis (2 groups: CAS: stages 1 or 2 the "good prognosis "versus the witnesses: stage 3 or 4 bad prognosis).

Our secondary objectives include:

• To study the link between cancer stage at diagnosis and diverse parameters describing living conditions
• To construct a new score for social fragility based on new data collected in this study, and to compare this score with the EPICES score
• To study patient quality of life at study baseline

Inclusion Criteria (for cases):

• Patient has been correctly informed about the study, and agrees to participate
• The patient must be insured or beneficiary of a health insurance plan
• Incident breast cancer cases (diagnosis based on pathology) excluding sarcoma, classifiable as stage III-IV, surgical cases

Inclusion Criteria (for controls):

• Patient has been correctly informed about the study, and agrees to participate
• The patient must be insured or beneficiary of a health insurance plan
• Incident breast cancer cases (diagnosis based on pathology) excluding sarcoma, classifiable as stage I-II, surgical cases

Exclusion Criteria (for cases and controls):

• The patient is in an exclusion period determined by a previous study
• The patient is under judicial protection, under tutorship or curatorship
• The patient is pregnant, parturient, or breastfeeding
• The patient is opposed to study participation
• Women not able to answer a questionnaire due to language barriers or due to vascular or degenerative cerebral dysfunction
• It is impossible to correctly inform the patient

This study is a case-control study concerning the female population suffering from breast cancer in the Herault department of France. Only invasive cancers are taken into account. For each case, we will have at least 2 controls, matched according to age +- 2 years.