NCIt definition : The capacity to bring about a desired effect.;
Alternative definition : NCI-GLOSS: Effectiveness. In medicine, the ability of an intervention (for example,
a drug or surgery) to produce the desired beneficial effect.; CDISC-GLOSS: A measure of intended effect on the disease or condition based on adequate
and well-controlled clinical trials. [After Providing Clinical Evidence of Effectiveness
for Human Drug and Biological Products. FDA GUIDANCE DOCUMENT. MAY 1998. After Demonstrating
Substantial Evidence of Effectiveness for Human Drug and Biological Products. FDA
Guidance for Industry (DRAFT GUIDANCE). December 2019] See also effectiveness.; MRCT-Ctr: How well a study treatment works in the study. (https://mrctcenter.org/glossaryterm/efficacy/);