Researchers studied 234 multiple myeloma patients who received a cutting-edge cancer treatment called BCMA CAR-T therapy. While this therapy can cause serious side effects related to immune system activation, the study found that dangerous fungal infections were surprisingly rare, occurring in only 1.7% of patients. However, when fungal infections did occur in these patients, they tended to be severe and life-threatening, highlighting the need for careful monitoring of high-risk patients.