E4

E4 is a genetic variant in the estrogen receptor gene (ESR1) that can influence how the body responds to estrogen, a key hormone in sex development and reproductive health. It may be associated with differences in hormone-related diseases, such as breast cancer, or variations in reproductive traits. While its exact impact varies between individuals, understanding E4 helps researchers and doctors better assess risks and personalize treatments related to hormone-sensitive conditions. It’s one piece of complex genetics that contributes to how our bodies function in relation to estrogen.