CYP19A1 and myocardial infarction: Overall, 89 and 92 hospitalizations for myocardial infarctions were observed among PS-matched women who respectively used aromatase inhibitors and tamoxifen, the corresponding rates incidence being 1.67 (1.32 to 2.02) and 1.69 (1.34 to 2.03) events every 1000 person-year (p = 0.470) (Table 2).