Oncorena develops a drug based on the natural substance orellanine, found in certain mushrooms known to cause kidney damage to persons who eat them.

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. In experiments Oncorena has demonstrated that orellanine kills also kidney cancer cells and this will now be verified in patients.