A Protocol Amendment... in cases when there are changes in the existing protocol that significantly affect safety of subjects, scope of the investigation, or scientific quality of the study. Such amendment should contain a brief description of the change and reference (date and number) to the submission that contained the original protocol. For example, changes requiring an amendment to an IND application may include: Any increase in drug dosage or duration of exposure of individual subjects to the drug beyond that described in the current protocol, or any significant increase in the number of subjects under study.
Any significant change in the design of a protocol (such as the addition or elimination of a control group).
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