SIOP continues to work together with CCIIPSO and PROS as its affiliated societies, to achieve shared goals through joint projects and programmes and operational/organizational platforms.

The Paediatric Radiation Oncology Society

The Paediatric Radiation Oncology Society, PROS is a SIOP collaborative society. Our ambition is to to bring together all radiation oncologists and allied professionals involved in paediatric oncology.

The International Society of Paediatric Surgical Oncology

The International Society of Paediatric Surgical Oncology is a SIOP collaborative society. IPSO is an international society of surgeons who specialise in the surgical care of children with cancer.

Childhood Cancer International

Childhood Cancer International (CCI; formerly International Confederation of Childhood Cancer Parent Organizations) was founded in 1994, as an umbrella organization of childhood cancer grassroots and national parent organizations.