ABSTRACT
BACKGROUND: In case reports, concerns have been raised as to whether finasteride use increases the risk of male breast cancer. Previous epidemiologic evidence on the potential link is conflicting. This study aimed to assess whether an association between finasteride use and male breast cancer exists after accounting for potential confounders. METHODS: The source population consisted of all men (≥35 years) from Denmark (1995-2014), Finland (1997-2013), and Sweden (2005-2014). Cases with incident male breast cancer were identified in the cancer registries and matched with 50 density-sampled, age, and country-matched male population controls per case. Exposure information on finasteride use was derived from the prescription registries. Potential confounders were identified using the directed acyclic graph methodology and measured by use of information from nation-wide registries. RESULTS: The study population comprised 1,005 male breast cancer cases and 43,058 controls. Confounder-adjusted odds of finasteride exposure were not statistically significantly increased [OR, 1.09; 95% confidence interval (CI), 0.77-1.54] in breast cancer cases relative to controls. There was no evidence of a dose-response relationship, as the group with greatest exposure to finasteride was associated with lowest OR of male breast cancer [OR, 0.72 (95% CI, 0.40-1.30)]. Sensitivity analyses did not reveal marked changes in results with different exposure definitions or for specific subgroups. CONCLUSIONS: Results from this study provided no evidence that finasteride use was associated with male breast cancer. IMPACT: This large confounder-adjusted study supports the view that exposure to finasteride is not associated materially with male breast cancer risk.
Subject(s)
Breast Neoplasms, Male/epidemiology , Finasteride/administration & dosage , 5-alpha Reductase Inhibitors/administration & dosage , 5-alpha Reductase Inhibitors/adverse effects , Adult , Aged , Breast Neoplasms, Male/chemically induced , Case-Control Studies , Denmark/epidemiology , Finasteride/adverse effects , Finland/epidemiology , Follow-Up Studies , Humans , Incidence , Male , Middle Aged , Prognosis , Registries , Risk Factors , Sweden/epidemiologyABSTRACT
AIM: The aim of the study was to examine, for female and male students separately, whether perceived quality of relationships with peers and parents and relations in school predict self-reported frequent drunkenness among Spanish adolescents. METHODS: The Spanish data from the Health Behaviour in School-aged Children Study (HBSC) 2010 survey were used including 1177 female and 1126 male students aged between 15 and 16 years. RESULTS: For both genders, students reporting low school satisfaction had increased odds of frequent drunkenness. Among females, low and medium levels of classmate support were associated with decreased odds of frequent drunkenness, whereas low perceived maternal knowledge as well as medium and low satisfaction with the family increased odds of being frequently drunk. The proportion of male students reporting medium satisfaction with friendships had significantly lower odds of frequent drunkenness compared with those with high level of satisfaction with friendships. CONCLUSION: We found different associations between perceived quality of social relations and frequent drunkenness among male and female students. Results showed that social relations seemed to better predictors of frequent drunkenness among female than male students and that other factors than social relations may contribute to explain excessive alcohol use among Spanish adolescents.
