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- W2660248540 abstract "e12003 Background: Young age has been associated with significantly increased risk of breast cancer (BC) death among women with luminal BC. One contributing factor might be the low rate of tamoxifen (TMX) adherence previously reported in this young group. Given that in Mexico a disproportionate rate of BC is diagnosed among YW, information regarding TMX adherence is particularly relevant. Our study's aim was to report TMX adherence in Mexican YW and its associated determinants. Methods: Consecutive patients ≤40y at diagnosis at the National Cancer Institute in Mexico City, under TMX treatment, completed a multiple-choice survey regarding the use and attitudes about hormonal therapy and adherence. Data of TMX disposal was collected from the pharmacy’s records, and the medication possession ratio (MPR) was calculated; an MPR ≥80% was considered adherent. Results: 135 YW with a median age at diagnosis of 35.7y (24-40) were included. 77% were undergraduate, 28% unpaired and 33% childless. Median follow-up was 26 months. 95% of patients reported a regular TMX intake: 70% did not miss any doses, while 25% missed 1-6 doses a month. Only 45% considered that the information received regarding TMX therapy was sufficient and for 37% was incomprehensive. 43% thought TMX significantly reduced their recurrence-risk and 60% strongly believed that they needed to be on TMX treatment. 73% of women reported adverse effects, being menopausal symptoms the most frequent, but only 27% were worried about the treatment long-term effects. From the 99 patients with a pharmacy record, 73% had an MPR > 80%. No significant factor was statistically associated with TMX adherence. Conclusions: Although Mexican YW and pharmacy data surprisingly sustained higher rates of TMX adherence compared to previous data, still a significant proportion of patients were non-adherent. Two-thirds of our patients reported having adverse effects, which might contribute to late TMX discontinuation. Since the newer recommendations of double hormonal blockade could lead to higher withdrawal rates of endocrine therapy in YW, adherence should be emphasized and closely monitored. Accordingly, hormonal treatment adherence should be a key component in the medical assessment of young luminal BC patients." @default.
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- W2660248540 date "2017-05-20" @default.
- W2660248540 modified "2023-10-01" @default.
- W2660248540 title "Adherence to tamoxifen in Mexican young women with breast cancer." @default.
- W2660248540 doi "https://doi.org/10.1200/jco.2017.35.15_suppl.e12003" @default.
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