Today on the Medscape Medical Minute: MRI surveillance may lower breast cancer mortality by 80% in women with BRCA1 sequence variations; UCSF researchers find evidence of SARS-CoV-2 in the body over a year after infection; and high levels of niacin consumption are tied to a reduced risk for premature death in people with metabolic dysfunction–associated steatotic liver disease. https://www.medscape.com/viewarticle/989872