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Science & Research

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Advancing Science

Research has shown that sex as a variable contributes to differences in the safety and efficacy of drugs, biologics, and devices. Biologics include vaccines and plasma. Devices can range from drug eluting stents, pacemakers to breast pumps and contact lenses.

To better understand the biologic basis for sex differences, FDA Office of Women’s Health advocates for the participation of women in clinical trials.  When both sexes are represented in preclinical and clinical research, a better understanding of the mechanistic basis for disease susceptibility and response to therapy can be achieved.

The Institute of Medicine defines gender as a difference between men and women that occurs due to cultural or social variations in a particular sex. A sex difference is defined as a difference due to the sex chromosome or sex hormones. –IOM Report Exploring the Biological Contributions to Human Health: Does Sex Matter?

As it will often not be clear whether an observed difference in safety or efficacy is due to gender or sex, the FDA has used the terms interchangeably to describe any difference-- cultural or social, genetic or hormonal-- between males and females.

This page provides FDA’s history on women’s participation in clinical trials.

    
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* An OWH funded study contributed to the development of this guidance.

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