Purpose: The association between tamoxifen (TMX) treatment and the risk of developing hyperlipidemia remains unclear.
Methods: The records of 41,726 patients with breast cancer (28,266 received TMX and 13,460 did not) were obtained from the Taiwan National Health Insurance Research Database for the period from January 2000 to December 2008. Three-fold women without breast cancer were the control group (N = 125, 178). The main end point was developing hyperlipidemia during the follow-up.
Results: During a mean follow-up of 9 years, the patients with breast cancer demonstrated a rate of developing hyperlipidemia that was 6% less (adjusted hazard ratio [HR], 0.94; 95% confidence interval [CI], 0.90-0.97) than that of the control participants without breast cancer. Stratification by age group indicated that only women aged ≥ 55 years who were diagnosed with breast cancer exhibited a significantly reduced risk of hyperlipidemia compared with the control group. With the use of 2 types of adjusted models, we observed that the TMX users (aged ≥ 55 years) consistently exhibited a significantly lower risk of hyperlipidemia than the non-TMX users and control participants (adjusted HRs, 0.79 and 0.82 from models 1 and 2, respectively). Within the 8-year follow-up period, patients with breast cancer and 366 to 1500 days of TMX therapy and > 1500 days of TMX therapy had significantly lower risks of hyperlipidemia compared with patients with ≤ 365 days of TMX therapy (adjusted HR, 0.54; 95% CI, 0.50-0.59; adjusted HR, 0.21; 95% CI, 0.18-0.24, respectively).
Conclusions: In Asian patients with breast cancer, TMX use was associated with reduced risks of hyperlipidemia.
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