I wonder about this too. I had a rare, aggressive leukemia and an unrelated breast cancer at the same time in 2023-24. After a 5+wk hospitalization I had another 9+mo out patient chemo treatment, 3 breast surgeries, and radiation. It was complicated and intense but I am cancer free. I’m also left with a string of health problems that now include a terrible case of PMR since early February that is not responding to treatment. I’d love to know if there is a connection but I’m not finding a lot of information either. I’m being told my situation was and continues to be so unusual, they just don’t have the data. I’ve told them to study me. Make a research project out of me. Maybe it will help the next person if they can figure my case out.