The rate of reoccurrence in the first 5 years with TNBC will depend a lot on the details from the pathology report, from the mastectomy. The tool linked above (and again here: https://breast.predict.nhs.uk), from the UK's National Health Service will give you some idea if you put in all the data from your pathology and the treatment path you chose. (Reoccurrence rate is the difference between survival rate and the deaths from other causes rate, the dotted yellow line on the graph.)

We will all be living with uncertainty, though. Everyone does whether they realize it or not. For us, it is simply undeniable. And that can be hard to deal with, emotionally, for anyone.

My wish for anyone going thru this is that they can find a way to be ok with uncertainty. I had Hodgkin's at age 35 and wasn't equipped to handle the uncertainty then. It really tore me apart, for several years after completing treatment.

Just listened to the first part of a podcast where they were discussing uncertainty, more broadly, and how to come to terms with it through meditation. I've tried but never really felt ok doing meditation, but I got some insight from listening that I think will be helpful for coping with the next few years (assuming I make it thru a few more). Maybe you will find it helpful, too. Here's the link: https://www.nytimes.com/2022/01/25/opinion/ezra-klein-podcast-ruth-ozeki.html