title: The magnitude of the association between smoking and the risk of developing cancer in Brazil: a multicenter study.
abstract: OBJECTIVE
  To estimate the magnitude of association and identify the aetiological fraction (AF) attributable to smoking in the development of different types of cancers in Brazil.
  
  
  METHODS
  We conducted a case-control study, including 231 102 patients registered in the Cancer Hospital Registries (CHR) in the period from 1998 to 2011.
  
  
  METHODS
  A total of 204 131 cancer cases relating to 30 topographies were compared with 26 971 cases of non-melanoma skin cancer.
  
  
  METHODS
  Smoking exposure was considered at the time of hospital registration. We calculated OR, unadjusted and adjusted for gender, age and alcohol consumption, with 95% CIs.
  
  
  RESULTS
  After adjustment, the risk of developing cancer associated with smoking was very high (piriform sinus, bronchi and lung, larynx, hypopharynx, oropharynx and oral cavity), high (oesophagus and bladder), moderate (anus and anal canal stomach, nasal cavity, middle ear and paranasal sinuses, pancreas, nasopharynx, other parts of the biliary tract and kidney and low (liver, gall)). There was no association between smoking and cancers of the central nervous system and myeloid leukaemia. For thyroid cancer there was a decreased risk of developing the disease. The AF was higher than 50% for hypopharynx, larynx, bronchi and lung, oropharynx, oral cavity and oesophagus cancers.
  
  
  CONCLUSIONS
  This study confirms a high risk of developing cancer of the hypopharynx, bronchi and lung, larynx, oropharynx and oral cavity, oesophagus and bladder cancer among smokers and establishes the AF attributable to smoking in the development of different types of cancer in Brazil.
authors: Clinical Research and Technology Incorporation Coordination, Brazilian National Cancer Institute, Rio de Janeiro (RJ), Brazil.
authors: Marcione Aparecida de Souza
authors: MA
authors: Moura
authors: Anke
authors: A
authors: Bergmann
authors: Suzana Sales de
authors: SS
authors: Aguiar
authors: Luiz Claudio Santos
authors: LC
authors: Thuler
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001938:Brazil / Q000453:epidemiology; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000453:epidemiology* / Q000209:etiology*; D012042:Registries; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects* / Q000453:epidemiology*
keywords: EPIDEMIOLOGY; PUBLIC HEALTH