title: COS, case-only-study on breast cancer before the age of 40. Announcement of a new study on gene-environment interaction in breast cancer.
authors.affiliation: Divisione di epidemiologia, Instituto Nazionale Tumori, Milano.
authors.forename: F
authors.initials: F
authors.lastname: Berrino
authors.forename: C
authors.initials: C
authors.lastname: Bellati
mesh_terms: D000328:Adult; D016587:Antimutagenic Agents; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics*; D016022:Case-Control Studies; D004777:Environment; D005260:Female; D006801:Humans; D007558:Italy / Q000453:epidemiology; D016296:Mutagenesis; D009153:Mutagens; D012307:Risk Factors; D012907:Smoking
chemical_list: D016587:Antimutagenic Agents; D009153:Mutagens