According to reports in the Polish media, Adam "Nergal" Darski, the 33-year-old leukemia-stricken guitarist/vocalist of the Polish extreme metal act BEHEMOTH, underwent a bone marrow transplant procedure earlier tonight, having found a donor that was a genetic match. He will spend the next four weeks in an isolation room at the hematology division of Uniwersyteckie Centrum Kliniczne (UCK) in Gdansk to avoid any infection while his immune system is low.