Several pharmacological agents are associated with hyperlipidemia. Tamoxife
n is an example of a drug-induced increase of serum triglyceride levels. Ho
wever, there are only scarce reports on how inborn errors in lipid metaboli
sm as well as secondary dyslipidemias, including diabetes mellitus, influen
ce the hypertriglyceridemic effect of tamoxifen. Herein, we describe a case
of a breast cancer patient receiving tamoxifen who presented with remarkab
le hypertriglyceridemia in the context of diabetes mellitus. We also provid
e a brief review of the relevant literature and discuss the mechanisms unde
rlying the pathogenesis of hypertriglyceridemia related to tamoxifen.