Today, the prognosis for a patient with renal (kidney) cancer that has spread is very poor. Current treatment of metastasized kidney cancer only, on average, prolongs the life for the suffering patients with a few months, and often the therapy has severe side-effects. Oncorena develops a drug based on the natural substance orellanine, found in certain mushrooms known to cause kidney damage to persons who eat them. In experiments we have demonstrated that orellanine kills also kidney cancer cells and this will now be verified in patients.