Behemoth frontman and lead guitarist Nergal's illness has been confirmed to be leukemia.

According to the Polish news site TVP, the disease has advanced to the point where chemotherapy can no longer be an effective treatment and can only be cured through a bone marrow transplant.

Within the country of Poland, there are only 100,000 donors out of a population of 38,192,000. Nergal's fiance Doda has already donated her bone marrow but it's unknown if her bone marrow will provide a DNA match.

Other Polish artists are currently organizing concerts to help raise awareness of Nergal's condition although no artists or concert dates have as yet been announced.

Nergal is currently undergoing a multi-stage, months-long treatment at Gdansk Medical University Hospital and all Behemoth tour dates indefinitely canceled for the foreseeable future.