The International Accreditation System for Interventional Oncology Services (IASIOS) offers facilities a unique opportunity to achieve a seal of quality and recognition for its interventional oncology services performed according to the CIRSE Standards of Quality in IO. The goal of IASIOS is to certify better patient care, support quantifiable benchmarks and encourage the development of IO. By enrolling in this programme, IO facilities can prove their compliance with the CIRSE IO Standards and their commitment to providing high quality care to cancer patients.