I can identify with this. I was diagnosed with prostate cancer in the summer of year 2017. My PSA was about 12 at time of biopsy. I revised my diet and took some supplements (Vit D) and actually brought my PSA down and kept it fairly stable at around 10-12 for over 3 years with MRI's not showing concern. But then it shot up to over 19, but worse yet, my last MRI showed some very troubling signs in the summer of 2021.
In my home, my oil furnace was not properly venting in the time about a year prior to the downturn! One could actually smell fuel oil in the home. So I had that dirty old oil furnace and indoor tank removed and replaced with a new gas furnace and arranged for "proton beam therapy" treatment at Mayo Clinic in fall of 2021. Since, my PSA as continually dropped to a level of under 0.5 as of two months ago.
Toxic air can cause cancer! And I would say if you have beginning stage cancer, make sure you have clean air. If you live in a polluted area, move. If you have a dirty oil furnace, get rid of it. Avoid breathing anything other than clean air. And adjust your diet to all non-processed whole foods, organic if possible. And exercise.