Breast cancer in other breast 2 1/2 years later

JLBinPDX

In 2017, I had triple negative stage 1ish, 2ish. Treatment was touch through chemo which reduced the tumor by at least 3/4 and had a lumpectomy. That was followed with four or so weeks of radiation. I moved through it, lived my life, and visited my treasured oncologist every three months. Well just three weeks ago he felt a small cyst. That cyst was nothing but the mammogram, ultra sound, biopsy found a new tumor--in the other breast, not triple negative and only .8 cm. I'm dealing with all of it surprisingly well as I've done this before, no chemo this time, lots more support, family mess and grave challenges are resolved, and I have great insurance and paid leave. I have a lumpectomy in 1 1/2 weeks with reduction and lift on the original cancer side since I'll be even more lopsided than I am now. I can handle all of this.

But why did my body generate a new (supposedly) cancer? And why does my body choose to create cancer cells? These are question no ones seems to have any idea how to even begin to answer. I guess it's so rare that no one knows quite what to even say about it. This, apparently, is a new "primary" cancer from what I read online. After I get through this treatment, do I then just live with the "maybe there'll be a next time"? Or are there studies or what? What next? Do I press on my oncologist, surgeon, or radiologist to try to come up with some version of why and what now? Still a little new at the recurrence thing--ugh.