Earlier, we said that a person's genetic profile can affect their response to a drug. This is a major reason why studies yield unclear answers. A means a person will have a good response to the medication. Suppose genetic profile B leads to a poor response. An experiment that ignored genetic profiles would study both types of people together and would give an unclear answer.
Clear answers mean fewer experiments and smaller studies.
As a result, clinical testing goes faster. There are concerns that the genetic profile of some people will leave them with no drugs to take. This is not necessarily a bad thing, since no drug may be better than the wrong drug. Of course, it would still take time to identify the important genetic profiles for any medication and disease. But drug companies can get a head start on this by understanding the genes that are important in the disease.