"complete regression" refers to a situation where something or someone reverts back to an earlier or less developed state or behavior. It means going back entirely or fully to a previous stage or condition. Full definition
There were many cases of improvement and even some cases of complete regression of the lesions. (thrivecuisine.com)
At the best - responding combination dose, 53 % of patients responded, with all of those patients achieving significant or complete regression of their cancer. (cancerresearch.org)
The study also showed that the eradication of the SIBO created an almost complete regression of symptoms. (healthy-holistic-living.com)