The study is quite detailed and will take awhile for most of us to get through and pull out useful information.
stm.sciencemag.org/content/...
There is a brief write up in STAT with interviews of study authors, basically it seems that certain stress hormones trigger neutrophil activity that releases a specific kind of lipid and in the presence of "activated neutrophils" and this lipid, cancer cells reawaken. A Beta blocker interrupted this process.
statnews.com/2020/12/02/ele...
Perhaps more evidence for taking that glass of red wine with dinner. Also there's plenty of evidence that exercise lowers stress.