The phrase "an existing trial" is correct and usable in written English.
It can be used when referring to a trial that is currently ongoing or has already been established.
Example: "The researchers are analyzing the data collected from an existing trial to determine the effectiveness of the new medication."
Alternatives: "a current trial" or "an ongoing trial".
Some £1.6 million of the fund will be used to extend an existing trial in Cumbria that involves recycling waste plastic and using it to form a tough new road surface that is far less likely to break up.
To see whether an older sibling can possibly fill in for some of that diluted attention, the researchers used data from an existing trial that included families from Toronto with 385 young children who had a sibling at least four years older.
One study involved members of the public, and another patients participating in an existing trial.
This paper discusses, and applies four approaches of analyzing non-inferiority trials with multiple events, by using data from an existing trial in which subjects with breast cancer could experience local recurrence, distant recurrence, death, or a combination of these events.
Do any existing trials provide clues?
However, rate control and anticoagulation is not a panacea; existing trial results should not be interpreted to mean all patients should be treated with the rate control approach.
As trials of this nature in these types of settings are unlikely in the future, a pooling of existing trial datasets may offer the best opportunity to identify principles and particular populations which may gain or lose most in ARV retreatment choices after failure of ART, MDR-HIV and limited retreatment options.
We have used a mathematical model, parameterised using existing trial findings, to understand and predict the impact of circumcision programmes at the population level.
In these cases, efficacy and effectiveness may be evaluated through the establishment of a scientific consensus between experts on the basis of existing trial experience [ 51, 52].
For the 99percentt of women without mutations in these or other high-risk genes, existing trial data do not speak to current trends.
Collectively, the existing trial evidence is not convincing enough to suggest that internal qigong is an effective modality for pain management.
