Human subjects in clinical trials: Ethical considerations and concernsGood Clinical Practice (GCP) is international guideline to ensure that clinical trials are designed, conducted, implemented, monitored, audited, recorded, analyzed, and reported scientifically and ethically. It also aims to protect human subject rights, integrity, and confidentiality. In 1997 GCP became effective, though not legally acknowledged at that point. In 2004, in the United Kingdom/Europe GCP became a legal obligation for all clinical trials involving investigational products. Historically, unethical and horrific research took place during the World War II by German clinicians at Nazi war cantonment, which led to the establishment of Nuremberg Code in 1947 [4]. The Universal Declaration of Human Rights became effective by the United Nation as a result of inhuman trials conducted during the World War II. In 1964, the Declaration of Helsinki was emerged and adopted by the World Medical Association and served as a backbone for the ethical principles that formulated the current International Conference on Harmonization (ICH)-GCP guidelines. In 1962, the Kefauver-Harris Amendments were adopted and required the FDA to assess all new drugs for safety and efficacy as a result of thalidomide tragedy that led to the born of 10,000 infants with fetal limb deformities in more than 20 countries worldwide [4].