ORBIS has demonstrated success and seems to function as a forum for other global regulators to leverage the FDA review. Participation in ORBIS may not always result in accelerated review timelines at collaborating agencies. However, project ORBIS is increasing review efficiency. This session will review the experiences gained by ORBIS participating partners highlighting lessons learned to enable future improvements. Regulators from FDA and selected countries will be invited to give testimonials on how they facilitated and supported ORBIS for their national registrations. Developers will review specific case studies from ORBIS collaborative reviews and their impact on international registrations in participating countries. We will identify factors to successfully engage in the project and highlight some challenges that might occur. The initial experiences can be used to optimize international registrations and speed access to livesaving oncology treatments.