Stroke Setback, PCOS Microbiome, CAR-T Gains, and Melanoma Genetics

Today: a halted stroke trial raises safety concerns about add-on thrombolysis after thrombectomy, new science links gut bacteria to hormone balance in polycystic ovary syndrome, a CRISPR screen finds a powerful gene pair for CAR-T cells, and the largest melanoma genetics study yet refines risk prediction. Plus, China's latest cancer statistics and an omega-3 trial in older adults with surprising results.