The European Institute of Oncology (Italian: Istituto Europeo di Oncologia, IEO) is a non-profit private-law comprehensive cancer centre located in Milan, Italy.

[1] The European Institute of Oncology works on the prevention, diagnosis and treatment of cancer by developing clinical and scientific research coupled with organisation and management.

The Institute became a research hospital and treatment centre (IRCCS or Istituto di Ricovero e Cura a Carattere Scientifico) through the Ministerial Decree issued in January 1996.

[3] The Institute integrates various activities involved in the fight against cancer: prevention and diagnosis, health education and training, research and treatment.

[7] The case report described a young Latin American girl whose fits of inappropriate laughter were mistakenly diagnosed as misbehavior or demonic possession, but were found to be Gelastic seizures caused by a brain tumor.