title: Breast cancer subtype of French women is not influenced by socioeconomic status: A population-based-study.
abstract: BACKGROUND
  The molecular subtype of breast tumours plays a major role in cancer prognosis and treatment options. Triple negative tumours (TN) carry the worst prognosis and affects most frequently women of low socioeconomic status (SES). Studies have shown that non-biologic factors, such as the socioeconomic status could have an influence on tumour biology. To this date no study has been done investigating this association in French women. The objective is to study the association between the SES and the molecular tumour subtype of breast cancer patients in the French county of Côte d'Or. This study benefits from the population data from the Côte d'Or breast cancer registry known for its strict quality control policy.
  
  
  METHODS
  Invasive breast cancer cases between 2003 and 2013 were extracted from the Breast cancer registry database in Côte d'Or. A multivariate analysis was conducted using a hierarchical polytomous regression for the multinomial outcomes for the cancer subtype with HR+/HER2 as reference category.
  
  
  RESULTS
  A total of 4553 cases were included in our study. There was no significant association found between SES and tumour subtype in French women at diagnosis. Women older than 75 years were less likely to have a TN and HR+/HER2+ breast cancer (OR = 0.66; CI95% = [0.46-0.94] and OR = 0.51; CI95% = [0.37-0.70] respectively). Women with TN tumour subtype had significantly less lymph node invasion when compared to HR+/HER2- subtype (OR = 0.71; CI95% = [0.54-0.92]).
  
  
  CONCLUSIONS
  No significant association was found between socioeconomic status and molecular subtype. Further studies are needed to clarify the mechanisms associated with developing each tumour subtype.
authors.affiliation: Breast and Gynaecologic Cancer Registry of Côte d'Or, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.|EA 4184, Medical School, University of Burgundy, 7 boulevard Jeanne d'Arc, Dijon, France.
authors.forename: Aviane
authors.initials: A
authors.lastname: Auguste
authors.affiliation: Breast and Gynaecologic Cancer Registry of Côte d'Or, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.
authors.forename: Marion
authors.initials: M
authors.lastname: Cortet
authors.affiliation: Breast and Gynaecologic Cancer Registry of Côte d'Or, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.|EA 4184, Medical School, University of Burgundy, 7 boulevard Jeanne d'Arc, Dijon, France.
authors.forename: Tienhan Sandrine
authors.initials: TS
authors.lastname: Dabakuyo-Yonli
authors.affiliation: Plateforme ERISC, U 1086 INSERM "Cancers and Preventions", François Baclesse Comprehensive Cancer Care Centre, 3 avenue du Général Harris, CAEN, France.
authors.forename: Ludivine
authors.initials: L
authors.lastname: Launay
authors.affiliation: Breast and Gynaecologic Cancer Registry of Côte d'Or, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Arnould
authors.affiliation: Breast and Gynaecologic Cancer Registry of Côte d'Or, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Desmoulins
authors.affiliation: Pathology Centre, 33 rue Nicolas Bornier, Dijon, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Roignot
authors.affiliation: Oncology Centre of Park, 18 cours du Général De Gaulle, Dijon, France.
authors.forename: Ariane
authors.initials: A
authors.lastname: Darut-Jouve
authors.affiliation: Breast and Gynaecologic Cancer Registry of Côte d'Or, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Poillot
authors.affiliation: EA 4184, Medical School, University of Burgundy, 7 boulevard Jeanne d'Arc, Dijon, France.|Biostatistics Unit, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.
authors.forename: Aurélie
authors.initials: A
authors.lastname: Bertaut
authors.affiliation: Breast and Gynaecologic Cancer Registry of Côte d'Or, Georges-François Leclerc Comprehensive Cancer Care Centre, 1 rue du Professeur Marion, Dijon, France.|EA 4184, Medical School, University of Burgundy, 7 boulevard Jeanne d'Arc, Dijon, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Arveux
mesh_terms: D000328:Adult; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000235:genetics; D005260:Female; D005602:France; D006801:Humans; D008875:Middle Aged; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics; D012042:Registries; D012959:Socioeconomic Factors
chemical_list: D018719:Erb-b2 Receptor Tyrosine Kinases; C508053:ERBB2 protein, human