Association of Heart Disease with Endogenous Testosterone

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Jinzang

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This study is getting a lot of attention in the press today. It used "Mendelian randomization." Basically, some genetic variants cause men to have lower testosterone levels and the study compared the rates of heart disease between men with and without these genetic variations. The study used data from a previous study of the use of dutasteride to prevent prostate cancer. The advantage of Mendelian randomization is that lifestyle behaviors that affect testosterone levels may have an independent effect on heart disease, but presumably the genetic variants that lower testosterone are free of these independent effects. The study concluded:

"In men, endogenous testosterone genetically predicted by variants in the JMJD1C gene region was positively associated with thromboembolism (odds ratio per unit increase in log transformed testosterone (nmol/L) 2.09, 95% confidence interval 1.27 to 3.46) and heart failure (7.81, 2.56 to 23.8), but not myocardial infarction (1.17, 0.78 to 1.75). Associations were less obvious in women. In the validation study, genetically predicted testosterone (based on JMJD1C gene region variants) was positively associated with myocardial infarction (1.37, 1.03 to 1.82)."

"Endogenous testosterone was positively associated with thromboembolism, heart failure, and myocardial infarction in men. Rates of these conditions are higher in men than women. Endogenous testosterone can be controlled with existing treatments and could be a modifiable risk factor for thromboembolism and heart failure."

Full text of the study is available online.
 
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Don't see the word "hematocrit" anywhere in that study. It would be of interest to know what kinds of protocols are used in Europe and how they compare to in the US.
 
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