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Factors Associated with Intentional and Unintentional Non-adherence to Adjuvant Endocrine Therapy Following Breast CancerAdherence to adjuvant endocrine therapy (AET) following breast cancer is known to be sub-optimal despite its known efficacy in reducing recurrence and mortality. This study aims to investigate factors associated with non-adherence and inform the development of interventions to support women and promote adherence. A questionnaire survey to measure level of adherence, side effects experienced, beliefs about medicine, support received and socio-demographic details was sent to 292 women 2-4 years post breast cancer diagnosis. Differences between non-adherers and adherers to AET were explored, and factors associated with intentional and unintentional non-adherence are reported. Approximately one quarter of respondents, 46 (22%), were non-adherers, comprising 29 (14%) intentional non-adherers and 17 (8%) unintentional non-adherers. Factors significantly associated with intentional non-adherence were: the presence of side effects (p<0.03), greater concerns about AET (p<0.001), and a lower perceived necessity to take AET (p<0.001). Half of the sample (105/211) reported that side effects had a moderate or high impact on their quality of life. Factors associated with unintentional non-adherence were: younger age (<65), (p<0.001), post-secondary education (p=0.046), and paid employment (p=0.031). There are distinct differences between intentional non-adherence and unintentional non-adherence. Differentiation between the two types of non-adherence may help tailor support and advice interventions
Psychometric properties of the Beliefs about Medicine Questionnaire (BMQ)-AET for Women taking Adjuvant Endocrine Therapies (AET) following early-stage breast cancerObjectives: To evaluate the Beliefs about Medicine Questionnaire to explore adherence to adjuvant endocrine therapy after treatment for breast cancer (BMQ-AET). Method: Factor structure of the BMQ-AET was explored alongside internal consistency, convergent validity and acceptability. Results: The BMQ-AET Specific Scale fitted the original 10 item model. Internal consistency of the BMQ-AET was much improved compared to the original BMQ and convergent validity showed predicted direction of correlation, although correlation with BMQ-AET concerns scale was low. Acceptability was good. Conclusions: The evaluation of the BMQ-AET is encouraging, and could facilitate future research around adherence to AET.